Nanostructured multifunctional materials and nanocomposites

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Nanostructured multifunctional materials and nanocomposites (en)
Наноструктурни мултифункционални материјали и нанокомпозити (sr)
Nanostrukturni multifunkcionalni materijali i nanokompoziti (sr_RS)
Authors

Publications

A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions

Ivanovski, Valentin N.; Belošević-Čavor, Jelena; Rajić, Vladimir; Umićević, Ana; Marković, Smilja; Kusigerski, Vladan; Mitrić, Miodrag; Koteski, Vasil J.

(2019)

TY  - JOUR
AU  - Ivanovski, Valentin N.
AU  - Belošević-Čavor, Jelena
AU  - Rajić, Vladimir
AU  - Umićević, Ana
AU  - Marković, Smilja
AU  - Kusigerski, Vladan
AU  - Mitrić, Miodrag
AU  - Koteski, Vasil J.
PY  - 2019
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/8515
AB  - In order to study the effect of Fe cation substitution on the local structure, defect formation, and hyperfine interactions in ZnO, Mössbauer spectroscopy measurements of the microwave processed Zn 1 - x Fe x O (x = 0.05, 0.10, 0.15, and 0.20) nanoparticles, together with ab initio calculations, were performed. Complementary information on the distribution of particle size and morphology, as well as magnetic properties, were obtained by X-ray diffraction, transmission electron microscopy, and squid-magnetometry. The selected model for analyzing the Mössbauer spectra of our samples is a distribution of quadrupole splittings. The fitting model with two Lorentz doublets was rejected due to its failure to include larger doublets. The Fe 3 + ions do not yield magnetic ordering in the samples at room temperature. The results from first-principles calculations confirm that the major component of the Mössbauer spectra corresponds to the Fe-alloyed ZnO with Zn vacancy in the next nearest neighbor environment. The magnetic measurements are consistent with the description of the distribution of iron ions over the randomly formed clusters in the ZnO host lattice. While at room temperature all the samples are paramagnetic, magnetic interactions cause a transition into a cluster spin-glass state at low temperatures. © 2019 Author(s).
T2  - Journal of Applied Physics
T1  - A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions
VL  - 126
IS  - 12
SP  - 125703
DO  - 10.1063/1.5095837
ER  - 
@article{
author = "Ivanovski, Valentin N. and Belošević-Čavor, Jelena and Rajić, Vladimir and Umićević, Ana and Marković, Smilja and Kusigerski, Vladan and Mitrić, Miodrag and Koteski, Vasil J.",
year = "2019",
abstract = "In order to study the effect of Fe cation substitution on the local structure, defect formation, and hyperfine interactions in ZnO, Mössbauer spectroscopy measurements of the microwave processed Zn 1 - x Fe x O (x = 0.05, 0.10, 0.15, and 0.20) nanoparticles, together with ab initio calculations, were performed. Complementary information on the distribution of particle size and morphology, as well as magnetic properties, were obtained by X-ray diffraction, transmission electron microscopy, and squid-magnetometry. The selected model for analyzing the Mössbauer spectra of our samples is a distribution of quadrupole splittings. The fitting model with two Lorentz doublets was rejected due to its failure to include larger doublets. The Fe 3 + ions do not yield magnetic ordering in the samples at room temperature. The results from first-principles calculations confirm that the major component of the Mössbauer spectra corresponds to the Fe-alloyed ZnO with Zn vacancy in the next nearest neighbor environment. The magnetic measurements are consistent with the description of the distribution of iron ions over the randomly formed clusters in the ZnO host lattice. While at room temperature all the samples are paramagnetic, magnetic interactions cause a transition into a cluster spin-glass state at low temperatures. © 2019 Author(s).",
journal = "Journal of Applied Physics",
title = "A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions",
volume = "126",
number = "12",
pages = "125703",
doi = "10.1063/1.5095837"
}
Ivanovski, V. N., Belošević-Čavor, J., Rajić, V., Umićević, A., Marković, S., Kusigerski, V., Mitrić, M.,& Koteski, V. J.. (2019). A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions. in Journal of Applied Physics, 126(12), 125703.
https://doi.org/10.1063/1.5095837
Ivanovski VN, Belošević-Čavor J, Rajić V, Umićević A, Marković S, Kusigerski V, Mitrić M, Koteski VJ. A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions. in Journal of Applied Physics. 2019;126(12):125703.
doi:10.1063/1.5095837 .
Ivanovski, Valentin N., Belošević-Čavor, Jelena, Rajić, Vladimir, Umićević, Ana, Marković, Smilja, Kusigerski, Vladan, Mitrić, Miodrag, Koteski, Vasil J., "A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions" in Journal of Applied Physics, 126, no. 12 (2019):125703,
https://doi.org/10.1063/1.5095837 . .
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5
4

Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides

Grbović-Novaković, Jasmina; Novaković, Nikola; Kurko, Sandra V.; Milošević Govedarović, Sanja S.; Pantić, Tijana; Paskaš Mamula, Bojana; Batalović, Katarina; Radaković, Jana; Rmuš, Jelena; Shelyapina, Marina; Skryabina, Nataliya; de Rango, Patricia; Fruchart, Daniel

(2019)

TY  - JOUR
AU  - Grbović-Novaković, Jasmina
AU  - Novaković, Nikola
AU  - Kurko, Sandra V.
AU  - Milošević Govedarović, Sanja S.
AU  - Pantić, Tijana
AU  - Paskaš Mamula, Bojana
AU  - Batalović, Katarina
AU  - Radaković, Jana
AU  - Rmuš, Jelena
AU  - Shelyapina, Marina
AU  - Skryabina, Nataliya
AU  - de Rango, Patricia
AU  - Fruchart, Daniel
PY  - 2019
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/8161
AB  - This review deals with the destabilization methods for improvement of storage properties of metal hydrides. Both theoretical and experimental approaches were used to point out the influence of various types of defects on structure and stability of hydrides. As a case study, Mg, and Ni based hydrides has been investigated. Theoretical studies, mainly carried out within various implementations of DFT, are a powerful tool to study mostly MgH 2 based materials. By providing an insight on metal-hydrogen bonding that governs both thermodynamics and hydrogen kinetics, they allow us to describe phenomena to which experimental methods have a limited access or do not have it at all: to follow the hydrogen sorption reaction on a specific metal surface and hydrogen induced phase transformations, to describe structure of phase boundaries or to explain the impact of defects or various additives on MgH 2 stability and hydrogen sorption kinetics. In several cases theoretical calculations reveal themselves as being able to predict new properties of materials, including the ways to modify Mg or MgH 2 that would lead to better characteristics in terms of hydrogen storage. The influence of ion irradiation and mechanical milling with and without additives has been discussed. Ion irradiation is the way to introduce a well-defined concentration of defects (Frankel pairs) at the surface and sub-surface layers of a material. Defects at the surface play the main role in sorption reaction since they enhance the dissociation of hydrogen. On the other hand, ball-milling introduce defects through the entire sample volume, refine the structure and thus decrease the path for hydrogen diffusion. Two Severe Plastic Deformation techniques were used to better understand the hydrogenation/dehydrogenation kinetics of Mg- and Mg 2 Ni-based alloys: Equal-Angular-Channel-Pressing and Fast-Forging. Successive ECAP passes leads to refinement of the microstructure of AZ31 ingots and to instalment therein of high densities of defects. Depending on mode, number and temperature of ECAP passes, the H-sorption kinetics have been improved satisfactorily without any additive for mass H-storage applications considering the relative speed of the shaping procedure. A qualitative understanding of the kinetic advanced principles has been built. Fast-Forging was used for a “quasi-instantaneous” synthesis of Mg/Mg 2 Ni-based composites. Hydrogenation of the as-received almost bi-phased materials remains rather slow as generally observed elsewhere, whatever are multiple and different techniques used to deliver the composite alloys. However, our preliminary results suggest that a synergic hydrogenation / dehydrogenation process should assist hydrogen transfers from Mg/Mg 2 Ni on one side to MgH 2 /Mg 2 NiH 4 on the other side via the rather stable a-Mg 2 NiH 0.3 , acting as in-situ catalyser. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
T2  - ChemPhysChem
T1  - Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides
VL  - 20
IS  - 10
SP  - 1216
EP  - 1247
DO  - 10.1002/cphc.201801125
ER  - 
@article{
author = "Grbović-Novaković, Jasmina and Novaković, Nikola and Kurko, Sandra V. and Milošević Govedarović, Sanja S. and Pantić, Tijana and Paskaš Mamula, Bojana and Batalović, Katarina and Radaković, Jana and Rmuš, Jelena and Shelyapina, Marina and Skryabina, Nataliya and de Rango, Patricia and Fruchart, Daniel",
year = "2019",
abstract = "This review deals with the destabilization methods for improvement of storage properties of metal hydrides. Both theoretical and experimental approaches were used to point out the influence of various types of defects on structure and stability of hydrides. As a case study, Mg, and Ni based hydrides has been investigated. Theoretical studies, mainly carried out within various implementations of DFT, are a powerful tool to study mostly MgH 2 based materials. By providing an insight on metal-hydrogen bonding that governs both thermodynamics and hydrogen kinetics, they allow us to describe phenomena to which experimental methods have a limited access or do not have it at all: to follow the hydrogen sorption reaction on a specific metal surface and hydrogen induced phase transformations, to describe structure of phase boundaries or to explain the impact of defects or various additives on MgH 2 stability and hydrogen sorption kinetics. In several cases theoretical calculations reveal themselves as being able to predict new properties of materials, including the ways to modify Mg or MgH 2 that would lead to better characteristics in terms of hydrogen storage. The influence of ion irradiation and mechanical milling with and without additives has been discussed. Ion irradiation is the way to introduce a well-defined concentration of defects (Frankel pairs) at the surface and sub-surface layers of a material. Defects at the surface play the main role in sorption reaction since they enhance the dissociation of hydrogen. On the other hand, ball-milling introduce defects through the entire sample volume, refine the structure and thus decrease the path for hydrogen diffusion. Two Severe Plastic Deformation techniques were used to better understand the hydrogenation/dehydrogenation kinetics of Mg- and Mg 2 Ni-based alloys: Equal-Angular-Channel-Pressing and Fast-Forging. Successive ECAP passes leads to refinement of the microstructure of AZ31 ingots and to instalment therein of high densities of defects. Depending on mode, number and temperature of ECAP passes, the H-sorption kinetics have been improved satisfactorily without any additive for mass H-storage applications considering the relative speed of the shaping procedure. A qualitative understanding of the kinetic advanced principles has been built. Fast-Forging was used for a “quasi-instantaneous” synthesis of Mg/Mg 2 Ni-based composites. Hydrogenation of the as-received almost bi-phased materials remains rather slow as generally observed elsewhere, whatever are multiple and different techniques used to deliver the composite alloys. However, our preliminary results suggest that a synergic hydrogenation / dehydrogenation process should assist hydrogen transfers from Mg/Mg 2 Ni on one side to MgH 2 /Mg 2 NiH 4 on the other side via the rather stable a-Mg 2 NiH 0.3 , acting as in-situ catalyser. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",
journal = "ChemPhysChem",
title = "Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides",
volume = "20",
number = "10",
pages = "1216-1247",
doi = "10.1002/cphc.201801125"
}
Grbović-Novaković, J., Novaković, N., Kurko, S. V., Milošević Govedarović, S. S., Pantić, T., Paskaš Mamula, B., Batalović, K., Radaković, J., Rmuš, J., Shelyapina, M., Skryabina, N., de Rango, P.,& Fruchart, D.. (2019). Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides. in ChemPhysChem, 20(10), 1216-1247.
https://doi.org/10.1002/cphc.201801125
Grbović-Novaković J, Novaković N, Kurko SV, Milošević Govedarović SS, Pantić T, Paskaš Mamula B, Batalović K, Radaković J, Rmuš J, Shelyapina M, Skryabina N, de Rango P, Fruchart D. Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides. in ChemPhysChem. 2019;20(10):1216-1247.
doi:10.1002/cphc.201801125 .
Grbović-Novaković, Jasmina, Novaković, Nikola, Kurko, Sandra V., Milošević Govedarović, Sanja S., Pantić, Tijana, Paskaš Mamula, Bojana, Batalović, Katarina, Radaković, Jana, Rmuš, Jelena, Shelyapina, Marina, Skryabina, Nataliya, de Rango, Patricia, Fruchart, Daniel, "Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides" in ChemPhysChem, 20, no. 10 (2019):1216-1247,
https://doi.org/10.1002/cphc.201801125 . .
1
6
6
6

Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides

Grbović-Novaković, Jasmina; Novaković, Nikola; Kurko, Sandra V.; Milošević Govedarović, Sanja S.; Pantić, Tijana; Paskaš Mamula, Bojana; Batalović, Katarina; Radaković, Jana; Rmuš, Jelena; Shelyapina, Marina; Skryabina, Nataliya; de Rango, Patricia; Fruchart, Daniel

(2019)

TY  - JOUR
AU  - Grbović-Novaković, Jasmina
AU  - Novaković, Nikola
AU  - Kurko, Sandra V.
AU  - Milošević Govedarović, Sanja S.
AU  - Pantić, Tijana
AU  - Paskaš Mamula, Bojana
AU  - Batalović, Katarina
AU  - Radaković, Jana
AU  - Rmuš, Jelena
AU  - Shelyapina, Marina
AU  - Skryabina, Nataliya
AU  - de Rango, Patricia
AU  - Fruchart, Daniel
PY  - 2019
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/8169
AB  - This review deals with the destabilization methods for improvement of storage properties of metal hydrides. Both theoretical and experimental approaches were used to point out the influence of various types of defects on structure and stability of hydrides. As a case study, Mg, and Ni based hydrides has been investigated. Theoretical studies, mainly carried out within various implementations of DFT, are a powerful tool to study mostly MgH 2 based materials. By providing an insight on metal-hydrogen bonding that governs both thermodynamics and hydrogen kinetics, they allow us to describe phenomena to which experimental methods have a limited access or do not have it at all: to follow the hydrogen sorption reaction on a specific metal surface and hydrogen induced phase transformations, to describe structure of phase boundaries or to explain the impact of defects or various additives on MgH 2 stability and hydrogen sorption kinetics. In several cases theoretical calculations reveal themselves as being able to predict new properties of materials, including the ways to modify Mg or MgH 2 that would lead to better characteristics in terms of hydrogen storage. The influence of ion irradiation and mechanical milling with and without additives has been discussed. Ion irradiation is the way to introduce a well-defined concentration of defects (Frankel pairs) at the surface and sub-surface layers of a material. Defects at the surface play the main role in sorption reaction since they enhance the dissociation of hydrogen. On the other hand, ball-milling introduce defects through the entire sample volume, refine the structure and thus decrease the path for hydrogen diffusion. Two Severe Plastic Deformation techniques were used to better understand the hydrogenation/dehydrogenation kinetics of Mg- and Mg 2 Ni-based alloys: Equal-Angular-Channel-Pressing and Fast-Forging. Successive ECAP passes leads to refinement of the microstructure of AZ31 ingots and to instalment therein of high densities of defects. Depending on mode, number and temperature of ECAP passes, the H-sorption kinetics have been improved satisfactorily without any additive for mass H-storage applications considering the relative speed of the shaping procedure. A qualitative understanding of the kinetic advanced principles has been built. Fast-Forging was used for a “quasi-instantaneous” synthesis of Mg/Mg 2 Ni-based composites. Hydrogenation of the as-received almost bi-phased materials remains rather slow as generally observed elsewhere, whatever are multiple and different techniques used to deliver the composite alloys. However, our preliminary results suggest that a synergic hydrogenation / dehydrogenation process should assist hydrogen transfers from Mg/Mg 2 Ni on one side to MgH 2 /Mg 2 NiH 4 on the other side via the rather stable a-Mg 2 NiH 0.3 , acting as in-situ catalyser. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
T2  - ChemPhysChem
T1  - Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides
VL  - 20
IS  - 10
SP  - 1216
EP  - 1247
DO  - 10.1002/cphc.201801125
ER  - 
@article{
author = "Grbović-Novaković, Jasmina and Novaković, Nikola and Kurko, Sandra V. and Milošević Govedarović, Sanja S. and Pantić, Tijana and Paskaš Mamula, Bojana and Batalović, Katarina and Radaković, Jana and Rmuš, Jelena and Shelyapina, Marina and Skryabina, Nataliya and de Rango, Patricia and Fruchart, Daniel",
year = "2019",
abstract = "This review deals with the destabilization methods for improvement of storage properties of metal hydrides. Both theoretical and experimental approaches were used to point out the influence of various types of defects on structure and stability of hydrides. As a case study, Mg, and Ni based hydrides has been investigated. Theoretical studies, mainly carried out within various implementations of DFT, are a powerful tool to study mostly MgH 2 based materials. By providing an insight on metal-hydrogen bonding that governs both thermodynamics and hydrogen kinetics, they allow us to describe phenomena to which experimental methods have a limited access or do not have it at all: to follow the hydrogen sorption reaction on a specific metal surface and hydrogen induced phase transformations, to describe structure of phase boundaries or to explain the impact of defects or various additives on MgH 2 stability and hydrogen sorption kinetics. In several cases theoretical calculations reveal themselves as being able to predict new properties of materials, including the ways to modify Mg or MgH 2 that would lead to better characteristics in terms of hydrogen storage. The influence of ion irradiation and mechanical milling with and without additives has been discussed. Ion irradiation is the way to introduce a well-defined concentration of defects (Frankel pairs) at the surface and sub-surface layers of a material. Defects at the surface play the main role in sorption reaction since they enhance the dissociation of hydrogen. On the other hand, ball-milling introduce defects through the entire sample volume, refine the structure and thus decrease the path for hydrogen diffusion. Two Severe Plastic Deformation techniques were used to better understand the hydrogenation/dehydrogenation kinetics of Mg- and Mg 2 Ni-based alloys: Equal-Angular-Channel-Pressing and Fast-Forging. Successive ECAP passes leads to refinement of the microstructure of AZ31 ingots and to instalment therein of high densities of defects. Depending on mode, number and temperature of ECAP passes, the H-sorption kinetics have been improved satisfactorily without any additive for mass H-storage applications considering the relative speed of the shaping procedure. A qualitative understanding of the kinetic advanced principles has been built. Fast-Forging was used for a “quasi-instantaneous” synthesis of Mg/Mg 2 Ni-based composites. Hydrogenation of the as-received almost bi-phased materials remains rather slow as generally observed elsewhere, whatever are multiple and different techniques used to deliver the composite alloys. However, our preliminary results suggest that a synergic hydrogenation / dehydrogenation process should assist hydrogen transfers from Mg/Mg 2 Ni on one side to MgH 2 /Mg 2 NiH 4 on the other side via the rather stable a-Mg 2 NiH 0.3 , acting as in-situ catalyser. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",
journal = "ChemPhysChem",
title = "Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides",
volume = "20",
number = "10",
pages = "1216-1247",
doi = "10.1002/cphc.201801125"
}
Grbović-Novaković, J., Novaković, N., Kurko, S. V., Milošević Govedarović, S. S., Pantić, T., Paskaš Mamula, B., Batalović, K., Radaković, J., Rmuš, J., Shelyapina, M., Skryabina, N., de Rango, P.,& Fruchart, D.. (2019). Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides. in ChemPhysChem, 20(10), 1216-1247.
https://doi.org/10.1002/cphc.201801125
Grbović-Novaković J, Novaković N, Kurko SV, Milošević Govedarović SS, Pantić T, Paskaš Mamula B, Batalović K, Radaković J, Rmuš J, Shelyapina M, Skryabina N, de Rango P, Fruchart D. Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides. in ChemPhysChem. 2019;20(10):1216-1247.
doi:10.1002/cphc.201801125 .
Grbović-Novaković, Jasmina, Novaković, Nikola, Kurko, Sandra V., Milošević Govedarović, Sanja S., Pantić, Tijana, Paskaš Mamula, Bojana, Batalović, Katarina, Radaković, Jana, Rmuš, Jelena, Shelyapina, Marina, Skryabina, Nataliya, de Rango, Patricia, Fruchart, Daniel, "Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides" in ChemPhysChem, 20, no. 10 (2019):1216-1247,
https://doi.org/10.1002/cphc.201801125 . .
1
6
6
6

Characterization of LiFePO4 samples obtained by pulse combustion under various conditions of synthesis

Lazarević, Zorica Ž.; Križan, Gregor; Križan, Janez; Milutinović, Aleksandra N.; Ivanovski, Valentin N.; Mitrić, Miodrag; Gilić, Martina; Umićević, Ana; Kuryliszyn-Kudelska, Izabela; Romčević, Nebojša Ž.

(2019)

TY  - JOUR
AU  - Lazarević, Zorica Ž.
AU  - Križan, Gregor
AU  - Križan, Janez
AU  - Milutinović, Aleksandra N.
AU  - Ivanovski, Valentin N.
AU  - Mitrić, Miodrag
AU  - Gilić, Martina
AU  - Umićević, Ana
AU  - Kuryliszyn-Kudelska, Izabela
AU  - Romčević, Nebojša Ž.
PY  - 2019
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/8501
AB  - Lithium iron phosphate (LiFePO4, LFP) is one of the widely used cathode materials for rechargeable lithium ion batteries. LFP batteries are widely used for electric vehicles and backup power due to their important advantages such as low cost, lifetime, efficiency, and reliability. There are still several technical challenges that need to be addressed: The increase of energy density or further reduction of their final cost. This paper concerned with the characterization of carbon coated LiFePO4 nanopowder cathode materials produced under different conditions by pulse combustion for providing energy to the reactor for the synthesis. The reactor was built according to the principles of the thermoacoustic burner on the basis of the Helmholtz resonator. The investigated nanopowders are synthesized by complete and incomplete combustion and calcined at 700 °C. The obtained samples were characterized by X-ray diffraction, Fourier transform infrared, Raman, and Mössbauer spectroscopy. Observed low-Temperature magnetic phase transitions definitively identified the crystal phases. The morphology of samples was controlled by scanning electron microscopy. The aim of this work is to show that it is possible to achieve a desired crystal phase by pulse combustion in a relatively cheap and fast way. The extremely rapid synthesis of almost pure phase material is possible due to the reduction in size of interacting particles and to an enormous number of collisions between them as a result of strong turbulent flow associated with explosive combustion. © 2019 Author(s).
T2  - Journal of Applied Physics
T1  - Characterization of LiFePO4 samples obtained by pulse combustion under various conditions of synthesis
VL  - 126
IS  - 8
SP  - 085109
DO  - 10.1063/1.5100358
ER  - 
@article{
author = "Lazarević, Zorica Ž. and Križan, Gregor and Križan, Janez and Milutinović, Aleksandra N. and Ivanovski, Valentin N. and Mitrić, Miodrag and Gilić, Martina and Umićević, Ana and Kuryliszyn-Kudelska, Izabela and Romčević, Nebojša Ž.",
year = "2019",
abstract = "Lithium iron phosphate (LiFePO4, LFP) is one of the widely used cathode materials for rechargeable lithium ion batteries. LFP batteries are widely used for electric vehicles and backup power due to their important advantages such as low cost, lifetime, efficiency, and reliability. There are still several technical challenges that need to be addressed: The increase of energy density or further reduction of their final cost. This paper concerned with the characterization of carbon coated LiFePO4 nanopowder cathode materials produced under different conditions by pulse combustion for providing energy to the reactor for the synthesis. The reactor was built according to the principles of the thermoacoustic burner on the basis of the Helmholtz resonator. The investigated nanopowders are synthesized by complete and incomplete combustion and calcined at 700 °C. The obtained samples were characterized by X-ray diffraction, Fourier transform infrared, Raman, and Mössbauer spectroscopy. Observed low-Temperature magnetic phase transitions definitively identified the crystal phases. The morphology of samples was controlled by scanning electron microscopy. The aim of this work is to show that it is possible to achieve a desired crystal phase by pulse combustion in a relatively cheap and fast way. The extremely rapid synthesis of almost pure phase material is possible due to the reduction in size of interacting particles and to an enormous number of collisions between them as a result of strong turbulent flow associated with explosive combustion. © 2019 Author(s).",
journal = "Journal of Applied Physics",
title = "Characterization of LiFePO4 samples obtained by pulse combustion under various conditions of synthesis",
volume = "126",
number = "8",
pages = "085109",
doi = "10.1063/1.5100358"
}
Lazarević, Z. Ž., Križan, G., Križan, J., Milutinović, A. N., Ivanovski, V. N., Mitrić, M., Gilić, M., Umićević, A., Kuryliszyn-Kudelska, I.,& Romčević, N. Ž.. (2019). Characterization of LiFePO4 samples obtained by pulse combustion under various conditions of synthesis. in Journal of Applied Physics, 126(8), 085109.
https://doi.org/10.1063/1.5100358
Lazarević ZŽ, Križan G, Križan J, Milutinović AN, Ivanovski VN, Mitrić M, Gilić M, Umićević A, Kuryliszyn-Kudelska I, Romčević NŽ. Characterization of LiFePO4 samples obtained by pulse combustion under various conditions of synthesis. in Journal of Applied Physics. 2019;126(8):085109.
doi:10.1063/1.5100358 .
Lazarević, Zorica Ž., Križan, Gregor, Križan, Janez, Milutinović, Aleksandra N., Ivanovski, Valentin N., Mitrić, Miodrag, Gilić, Martina, Umićević, Ana, Kuryliszyn-Kudelska, Izabela, Romčević, Nebojša Ž., "Characterization of LiFePO4 samples obtained by pulse combustion under various conditions of synthesis" in Journal of Applied Physics, 126, no. 8 (2019):085109,
https://doi.org/10.1063/1.5100358 . .

The influence of oxygen vacancy concentration in nanodispersed non-stoichiometric CeO2-δ oxides on the physico-chemical properties of conducting polyaniline/CeO2 composites

Kuzmanović, Bojana; Vujković, Milica; Tomić, Nataša M.; Bajuk-Bogdanović, Danica V.; Lazović, Vladimir M.; Šljukić, Biljana; Ivanović, Nenad; Mentus, Slavko V.

(2019)

TY  - JOUR
AU  - Kuzmanović, Bojana
AU  - Vujković, Milica
AU  - Tomić, Nataša M.
AU  - Bajuk-Bogdanović, Danica V.
AU  - Lazović, Vladimir M.
AU  - Šljukić, Biljana
AU  - Ivanović, Nenad
AU  - Mentus, Slavko V.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0013468619305584
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/8135
AB  - Cerium oxide (CeO 2-δ ) ultrafine nanoparticles, with the lower (CeO 2-δ -HT) and higher (CeO 2-δ -SS) fraction of oxygen vacancies, were used as anchoring sites for the polymerization of aniline in acidic medium. As a result, polyaniline-emeraldine salt (PANI-ES)-based composites (PANI-ES@CeO 2-δ -HT and PANI-ES@CeO 2-δ -SS) were obtained. The interaction between CeO 2-δ and PANI was examined by FTIR and Raman spectroscopy. The PANI polymerization is initiated via electrostatic interaction of anilinium cation and Cl − ions (adsorbed at the protonated hydroxyl groups of CeO 2-δ ), and proceeds with hydrogen and nitrogen interaction with oxide nanoparticles. Tailoring the oxygen vacancy population of oxide offers the possibility to control the type of PANI-cerium oxide interaction, and consequently structural, electrical, thermal, electronic and charge storage properties of composite. A high capacitance of synthesized materials, reaching ∼294 F g −1 (PANI-ES), ∼299 F g −1 (PANI-ES@CeO 2-δ -HT) and ∼314 F g −1 (PANI-ES@CeO 2-δ -SS), was measured in 1 M HCl, at a common scan rate of 20 mV s −1 . The high adhesion of PANI with cerium oxide prevents the oxide from its slow dissolution in 1MHCl thus providing the stability of this composite in an acidic solution. The rate of electrochemical oxidation of emeraldine salt into pernigraniline was also found to depend on CeO 2-δ characteristics. © 2019 Elsevier Ltd
T2  - Electrochimica Acta
T1  - The influence of oxygen vacancy concentration in nanodispersed non-stoichiometric CeO2-δ oxides on the physico-chemical properties of conducting polyaniline/CeO2 composites
VL  - 306
SP  - 506
EP  - 515
DO  - 10.1016/j.electacta.2019.03.135
ER  - 
@article{
author = "Kuzmanović, Bojana and Vujković, Milica and Tomić, Nataša M. and Bajuk-Bogdanović, Danica V. and Lazović, Vladimir M. and Šljukić, Biljana and Ivanović, Nenad and Mentus, Slavko V.",
year = "2019",
abstract = "Cerium oxide (CeO 2-δ ) ultrafine nanoparticles, with the lower (CeO 2-δ -HT) and higher (CeO 2-δ -SS) fraction of oxygen vacancies, were used as anchoring sites for the polymerization of aniline in acidic medium. As a result, polyaniline-emeraldine salt (PANI-ES)-based composites (PANI-ES@CeO 2-δ -HT and PANI-ES@CeO 2-δ -SS) were obtained. The interaction between CeO 2-δ and PANI was examined by FTIR and Raman spectroscopy. The PANI polymerization is initiated via electrostatic interaction of anilinium cation and Cl − ions (adsorbed at the protonated hydroxyl groups of CeO 2-δ ), and proceeds with hydrogen and nitrogen interaction with oxide nanoparticles. Tailoring the oxygen vacancy population of oxide offers the possibility to control the type of PANI-cerium oxide interaction, and consequently structural, electrical, thermal, electronic and charge storage properties of composite. A high capacitance of synthesized materials, reaching ∼294 F g −1 (PANI-ES), ∼299 F g −1 (PANI-ES@CeO 2-δ -HT) and ∼314 F g −1 (PANI-ES@CeO 2-δ -SS), was measured in 1 M HCl, at a common scan rate of 20 mV s −1 . The high adhesion of PANI with cerium oxide prevents the oxide from its slow dissolution in 1MHCl thus providing the stability of this composite in an acidic solution. The rate of electrochemical oxidation of emeraldine salt into pernigraniline was also found to depend on CeO 2-δ characteristics. © 2019 Elsevier Ltd",
journal = "Electrochimica Acta",
title = "The influence of oxygen vacancy concentration in nanodispersed non-stoichiometric CeO2-δ oxides on the physico-chemical properties of conducting polyaniline/CeO2 composites",
volume = "306",
pages = "506-515",
doi = "10.1016/j.electacta.2019.03.135"
}
Kuzmanović, B., Vujković, M., Tomić, N. M., Bajuk-Bogdanović, D. V., Lazović, V. M., Šljukić, B., Ivanović, N.,& Mentus, S. V.. (2019). The influence of oxygen vacancy concentration in nanodispersed non-stoichiometric CeO2-δ oxides on the physico-chemical properties of conducting polyaniline/CeO2 composites. in Electrochimica Acta, 306, 506-515.
https://doi.org/10.1016/j.electacta.2019.03.135
Kuzmanović B, Vujković M, Tomić NM, Bajuk-Bogdanović DV, Lazović VM, Šljukić B, Ivanović N, Mentus SV. The influence of oxygen vacancy concentration in nanodispersed non-stoichiometric CeO2-δ oxides on the physico-chemical properties of conducting polyaniline/CeO2 composites. in Electrochimica Acta. 2019;306:506-515.
doi:10.1016/j.electacta.2019.03.135 .
Kuzmanović, Bojana, Vujković, Milica, Tomić, Nataša M., Bajuk-Bogdanović, Danica V., Lazović, Vladimir M., Šljukić, Biljana, Ivanović, Nenad, Mentus, Slavko V., "The influence of oxygen vacancy concentration in nanodispersed non-stoichiometric CeO2-δ oxides on the physico-chemical properties of conducting polyaniline/CeO2 composites" in Electrochimica Acta, 306 (2019):506-515,
https://doi.org/10.1016/j.electacta.2019.03.135 . .
4
3
4

Effect of 5d transition metals doping on the photocatalytic properties of rutile TiO 2

Belošević-Čavor, Jelena; Koteski, Vasil J.; Umićević, Ana; Ivanovski, Valentin N.

(2018)

TY  - JOUR
AU  - Belošević-Čavor, Jelena
AU  - Koteski, Vasil J.
AU  - Umićević, Ana
AU  - Ivanovski, Valentin N.
PY  - 2018
UR  - http://linkinghub.elsevier.com/retrieve/pii/S0927025618303306
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7700
AB  - Density functional theory (DFT) calculations were performed to address the effects of 5d transition metals (TM) doping on the electronic structure properties of rutile TiO2, using both the modified Becke-Johnson (mBJ) and on-site hybrid functional. The calculations show that there is a reduction of band gap in almost all the investigated cases, except when TiO2is doped with Ta. Some of the investigated systems (Re, W, Os, Ir) exhibit pronounced spin polarization, mainly arising from the TM atoms. In addition, a large increase of band gap is observed, when switching from a 24-atoms to 48-atoms supercell, while further enlarging the supercell size doesn't affect the band gap significantly. Among the investigated transition metals, Pt and Ir are the best candidates for improving the photocatalytic properties of rutile TiO2through substitutional doping.
T2  - Computational Materials Science
T1  - Effect of 5d transition metals doping on the photocatalytic properties of rutile TiO 2
VL  - 151
SP  - 328
EP  - 337
DO  - 10.1016/j.commatsci.2018.05.022
ER  - 
@article{
author = "Belošević-Čavor, Jelena and Koteski, Vasil J. and Umićević, Ana and Ivanovski, Valentin N.",
year = "2018",
abstract = "Density functional theory (DFT) calculations were performed to address the effects of 5d transition metals (TM) doping on the electronic structure properties of rutile TiO2, using both the modified Becke-Johnson (mBJ) and on-site hybrid functional. The calculations show that there is a reduction of band gap in almost all the investigated cases, except when TiO2is doped with Ta. Some of the investigated systems (Re, W, Os, Ir) exhibit pronounced spin polarization, mainly arising from the TM atoms. In addition, a large increase of band gap is observed, when switching from a 24-atoms to 48-atoms supercell, while further enlarging the supercell size doesn't affect the band gap significantly. Among the investigated transition metals, Pt and Ir are the best candidates for improving the photocatalytic properties of rutile TiO2through substitutional doping.",
journal = "Computational Materials Science",
title = "Effect of 5d transition metals doping on the photocatalytic properties of rutile TiO 2",
volume = "151",
pages = "328-337",
doi = "10.1016/j.commatsci.2018.05.022"
}
Belošević-Čavor, J., Koteski, V. J., Umićević, A.,& Ivanovski, V. N.. (2018). Effect of 5d transition metals doping on the photocatalytic properties of rutile TiO 2. in Computational Materials Science, 151, 328-337.
https://doi.org/10.1016/j.commatsci.2018.05.022
Belošević-Čavor J, Koteski VJ, Umićević A, Ivanovski VN. Effect of 5d transition metals doping on the photocatalytic properties of rutile TiO 2. in Computational Materials Science. 2018;151:328-337.
doi:10.1016/j.commatsci.2018.05.022 .
Belošević-Čavor, Jelena, Koteski, Vasil J., Umićević, Ana, Ivanovski, Valentin N., "Effect of 5d transition metals doping on the photocatalytic properties of rutile TiO 2" in Computational Materials Science, 151 (2018):328-337,
https://doi.org/10.1016/j.commatsci.2018.05.022 . .
7
6
6

Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media

Golubović, Aleksandar V.; Simovic, Bojana; Gašić, Slavica M.; Mijin, Dušan Ž.; Matković, Aleksandar; Babić, Biljana M.; Šćepanović, Maja

(2017)

TY  - JOUR
AU  - Golubović, Aleksandar V.
AU  - Simovic, Bojana
AU  - Gašić, Slavica M.
AU  - Mijin, Dušan Ž.
AU  - Matković, Aleksandar
AU  - Babić, Biljana M.
AU  - Šćepanović, Maja
PY  - 2017
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1779
AB  - TiO2 nanopowders were produced by sol-gel technique using TiCl4 as a starting material. For the preparation of crystalline anatase with developed surface area, this aqueous solution has been mixed with 0.05 M or 0.07 M (NH4)(2)SO4 solution in a temperature-controlled bath. The pH values of the suspension were 7, 8 or 9. According to the x-ray diffraction (XRD) analysis the anatase crystallite sizes were about 12 nm, which coincided with the average particle size revealed by scanning electron microscopy (SEM). The Raman scattering measurements have shown the presence of a small amount of highly disordered brookite phase in addition to dominant anatase phase with similar nanostructure in all synthesized powders. BET measurements revealed that all synthesized catalysts were fully mesoporous, except the sample synthesized with 0.07 M (NH4)(2)SO4 at pH=9, which had small amount of micropores. The photocatalytic degradation of herbicide Clomazone was carried out for both the pure active substance and as the commercial product (GAMIT 4-EC) under UV irradiation. The best photocatalytic efficiency was obtained for the catalyst with the largest specific surface area, confirming this parameter as crucial for enhanced photocatalytic degradation of the pure active substance and commercial product of herbicide Clomazone.
T2  - Science of Sintering
T1  - Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media
VL  - 49
IS  - 3
SP  - 319
EP  - 330
DO  - 10.2298/SOS1703319G
ER  - 
@article{
author = "Golubović, Aleksandar V. and Simovic, Bojana and Gašić, Slavica M. and Mijin, Dušan Ž. and Matković, Aleksandar and Babić, Biljana M. and Šćepanović, Maja",
year = "2017",
abstract = "TiO2 nanopowders were produced by sol-gel technique using TiCl4 as a starting material. For the preparation of crystalline anatase with developed surface area, this aqueous solution has been mixed with 0.05 M or 0.07 M (NH4)(2)SO4 solution in a temperature-controlled bath. The pH values of the suspension were 7, 8 or 9. According to the x-ray diffraction (XRD) analysis the anatase crystallite sizes were about 12 nm, which coincided with the average particle size revealed by scanning electron microscopy (SEM). The Raman scattering measurements have shown the presence of a small amount of highly disordered brookite phase in addition to dominant anatase phase with similar nanostructure in all synthesized powders. BET measurements revealed that all synthesized catalysts were fully mesoporous, except the sample synthesized with 0.07 M (NH4)(2)SO4 at pH=9, which had small amount of micropores. The photocatalytic degradation of herbicide Clomazone was carried out for both the pure active substance and as the commercial product (GAMIT 4-EC) under UV irradiation. The best photocatalytic efficiency was obtained for the catalyst with the largest specific surface area, confirming this parameter as crucial for enhanced photocatalytic degradation of the pure active substance and commercial product of herbicide Clomazone.",
journal = "Science of Sintering",
title = "Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media",
volume = "49",
number = "3",
pages = "319-330",
doi = "10.2298/SOS1703319G"
}
Golubović, A. V., Simovic, B., Gašić, S. M., Mijin, D. Ž., Matković, A., Babić, B. M.,& Šćepanović, M.. (2017). Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media. in Science of Sintering, 49(3), 319-330.
https://doi.org/10.2298/SOS1703319G
Golubović AV, Simovic B, Gašić SM, Mijin DŽ, Matković A, Babić BM, Šćepanović M. Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media. in Science of Sintering. 2017;49(3):319-330.
doi:10.2298/SOS1703319G .
Golubović, Aleksandar V., Simovic, Bojana, Gašić, Slavica M., Mijin, Dušan Ž., Matković, Aleksandar, Babić, Biljana M., Šćepanović, Maja, "Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media" in Science of Sintering, 49, no. 3 (2017):319-330,
https://doi.org/10.2298/SOS1703319G . .
2
2

Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior

Vranješ, Mila; Kuljanin-Jakovljević, Jadranka Ž.; Konstantinović, Zorica; Pomar, Alberto; Stoiljković, Milovan; Mitrić, Miodrag; Radetic, Tamara; Šaponjić, Zoran

(2017)

TY  - JOUR
AU  - Vranješ, Mila
AU  - Kuljanin-Jakovljević, Jadranka Ž.
AU  - Konstantinović, Zorica
AU  - Pomar, Alberto
AU  - Stoiljković, Milovan
AU  - Mitrić, Miodrag
AU  - Radetic, Tamara
AU  - Šaponjić, Zoran
PY  - 2017
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1792
AB  - Co2+ doped TiO2 nanocrystals were synthetized by a hydrothermal treatment procedure applied to precursor dispersion of titania nanotubes and Co2+ ions. Mixture of polygonal and prolate spheroid-like nanocrystals was obtained. The results of X-ray diffraction (XRD) analysis showed that resulted nanocrystals retain anatase crystal phase for both dopant concentrations (1.69 and 2.5 at%), but the crystal lattice parameters were affected. Reflection spectra revealed altered optical properties compared to bare TiO2. Room temperature ferromagnetic ordering with saturation magnetic moment in the range of 0.001-0.002 mu (B)/Co was observed for both measured films made of Co2+ doped TiO2 nanocrystals.
T2  - Journal of Advanced Ceramics
T1  - Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior
VL  - 6
IS  - 3
SP  - 220
EP  - 229
DO  - 10.1007/s40145-017-0233-5
ER  - 
@article{
author = "Vranješ, Mila and Kuljanin-Jakovljević, Jadranka Ž. and Konstantinović, Zorica and Pomar, Alberto and Stoiljković, Milovan and Mitrić, Miodrag and Radetic, Tamara and Šaponjić, Zoran",
year = "2017",
abstract = "Co2+ doped TiO2 nanocrystals were synthetized by a hydrothermal treatment procedure applied to precursor dispersion of titania nanotubes and Co2+ ions. Mixture of polygonal and prolate spheroid-like nanocrystals was obtained. The results of X-ray diffraction (XRD) analysis showed that resulted nanocrystals retain anatase crystal phase for both dopant concentrations (1.69 and 2.5 at%), but the crystal lattice parameters were affected. Reflection spectra revealed altered optical properties compared to bare TiO2. Room temperature ferromagnetic ordering with saturation magnetic moment in the range of 0.001-0.002 mu (B)/Co was observed for both measured films made of Co2+ doped TiO2 nanocrystals.",
journal = "Journal of Advanced Ceramics",
title = "Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior",
volume = "6",
number = "3",
pages = "220-229",
doi = "10.1007/s40145-017-0233-5"
}
Vranješ, M., Kuljanin-Jakovljević, J. Ž., Konstantinović, Z., Pomar, A., Stoiljković, M., Mitrić, M., Radetic, T.,& Šaponjić, Z.. (2017). Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior. in Journal of Advanced Ceramics, 6(3), 220-229.
https://doi.org/10.1007/s40145-017-0233-5
Vranješ M, Kuljanin-Jakovljević JŽ, Konstantinović Z, Pomar A, Stoiljković M, Mitrić M, Radetic T, Šaponjić Z. Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior. in Journal of Advanced Ceramics. 2017;6(3):220-229.
doi:10.1007/s40145-017-0233-5 .
Vranješ, Mila, Kuljanin-Jakovljević, Jadranka Ž., Konstantinović, Zorica, Pomar, Alberto, Stoiljković, Milovan, Mitrić, Miodrag, Radetic, Tamara, Šaponjić, Zoran, "Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior" in Journal of Advanced Ceramics, 6, no. 3 (2017):220-229,
https://doi.org/10.1007/s40145-017-0233-5 . .
2
2
2

Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition

Stojadinovic, Bojan; Dohčević-Mitrović, Zorana ; Stepanenko, Dimitrije; Rosić, Milena; Petronijević, Ivan M.; Tasić, Nikola B.; Ilic, Nikola; Matović, Branko; Stojanovic, Biljana

(2017)

TY  - JOUR
AU  - Stojadinovic, Bojan
AU  - Dohčević-Mitrović, Zorana 
AU  - Stepanenko, Dimitrije
AU  - Rosić, Milena
AU  - Petronijević, Ivan M.
AU  - Tasić, Nikola B.
AU  - Ilic, Nikola
AU  - Matović, Branko
AU  - Stojanovic, Biljana
PY  - 2017
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1804
AB  - We have studied Ho-doped BiFeO3 nanopowders (Bi1-xHoxFeO3, x = 0-0.15), prepared via sol-gel method, in order to analyse the effect of substitution-driven structural transition on dielectric and ferroelectric properties of bismuth ferrite. X-ray diffraction and Raman study demonstrated that an increased Ho concentration (x GT = 0.1) has induced gradual phase transition from rhombohedral to orthorhombic phase. The frequency dependent permittivity of Bi1-xHoxFeO3 nanopowders was analysed within a model which incorporates Debye-like dielectric response and dc and ac conductivity contributions based on universal dielectric response. It was shown that influence of leakage current and grain boundary/interface effects on dielectric and ferroelectric properties was substantially reduced in biphasic Bi1-xHoxFeO3 (x GT 0.1) samples. The electrical performance of Bi0.85Ho0.15FeO3 sample, for which orthorhombic phase prevailed, was significantly improved and Bi0.85Ho0.15FeO3 has sustained strong applied electric fields (up to 100 kV/cm) without breakdown. Under strong external fields, the polarization exhibited strong frequency dependence. The low-frequency remnant polarization and coercive field of Bi0.85Ho0.15FeO3 were significantly enhanced. It was proposed that defect dipolar polarization substantially contributed to the intrinsic polarization of Bi0.85Ho0.15FeO3 under strong electric fields at low frequencies.
T2  - Ceramics International
T1  - Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition
VL  - 43
IS  - 18
SP  - 16531
EP  - 16538
DO  - 10.1016/j.ceramint.2017.09.038
ER  - 
@article{
author = "Stojadinovic, Bojan and Dohčević-Mitrović, Zorana  and Stepanenko, Dimitrije and Rosić, Milena and Petronijević, Ivan M. and Tasić, Nikola B. and Ilic, Nikola and Matović, Branko and Stojanovic, Biljana",
year = "2017",
abstract = "We have studied Ho-doped BiFeO3 nanopowders (Bi1-xHoxFeO3, x = 0-0.15), prepared via sol-gel method, in order to analyse the effect of substitution-driven structural transition on dielectric and ferroelectric properties of bismuth ferrite. X-ray diffraction and Raman study demonstrated that an increased Ho concentration (x GT = 0.1) has induced gradual phase transition from rhombohedral to orthorhombic phase. The frequency dependent permittivity of Bi1-xHoxFeO3 nanopowders was analysed within a model which incorporates Debye-like dielectric response and dc and ac conductivity contributions based on universal dielectric response. It was shown that influence of leakage current and grain boundary/interface effects on dielectric and ferroelectric properties was substantially reduced in biphasic Bi1-xHoxFeO3 (x GT 0.1) samples. The electrical performance of Bi0.85Ho0.15FeO3 sample, for which orthorhombic phase prevailed, was significantly improved and Bi0.85Ho0.15FeO3 has sustained strong applied electric fields (up to 100 kV/cm) without breakdown. Under strong external fields, the polarization exhibited strong frequency dependence. The low-frequency remnant polarization and coercive field of Bi0.85Ho0.15FeO3 were significantly enhanced. It was proposed that defect dipolar polarization substantially contributed to the intrinsic polarization of Bi0.85Ho0.15FeO3 under strong electric fields at low frequencies.",
journal = "Ceramics International",
title = "Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition",
volume = "43",
number = "18",
pages = "16531-16538",
doi = "10.1016/j.ceramint.2017.09.038"
}
Stojadinovic, B., Dohčević-Mitrović, Z., Stepanenko, D., Rosić, M., Petronijević, I. M., Tasić, N. B., Ilic, N., Matović, B.,& Stojanovic, B.. (2017). Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition. in Ceramics International, 43(18), 16531-16538.
https://doi.org/10.1016/j.ceramint.2017.09.038
Stojadinovic B, Dohčević-Mitrović Z, Stepanenko D, Rosić M, Petronijević IM, Tasić NB, Ilic N, Matović B, Stojanovic B. Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition. in Ceramics International. 2017;43(18):16531-16538.
doi:10.1016/j.ceramint.2017.09.038 .
Stojadinovic, Bojan, Dohčević-Mitrović, Zorana , Stepanenko, Dimitrije, Rosić, Milena, Petronijević, Ivan M., Tasić, Nikola B., Ilic, Nikola, Matović, Branko, Stojanovic, Biljana, "Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition" in Ceramics International, 43, no. 18 (2017):16531-16538,
https://doi.org/10.1016/j.ceramint.2017.09.038 . .
11
10
10

Yttrium Orthoferrite Powder Obtained by the Mechanochemical Synthesis

Lazarević, Zorica Ž.; Jovalekic, Cedomir; Gilic, Martina; Ivanovski, Valentin N.; Umićević, Ana; Sekulić, Dalibor L.; Romčević, Nebojša Ž.

(2017)

TY  - JOUR
AU  - Lazarević, Zorica Ž.
AU  - Jovalekic, Cedomir
AU  - Gilic, Martina
AU  - Ivanovski, Valentin N.
AU  - Umićević, Ana
AU  - Sekulić, Dalibor L.
AU  - Romčević, Nebojša Ž.
PY  - 2017
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1778
AB  - Yttrium orthoferrite (YFeO3) powder was prepared by a mechanochemical synthesis from a mixture of Y2O3 and alpha-Fe2O3 powders in a planetary ball mill for 2.5 h. The obtained YFeO3 powder sample was characterized by X-ray diffraction (XRD), Raman and infrared spectroscopy. The average crystallite size calculated by the Scherrer equation was 12 nm. The Mossbauer spectroscopy at room temperature confirms the superparamagnetic character of YFeO3 orthoferrite sample.
T2  - Science of Sintering
T1  - Yttrium Orthoferrite Powder Obtained by the Mechanochemical Synthesis
VL  - 49
IS  - 3
SP  - 277
EP  - 284
DO  - 10.2298/SOS1703277L
ER  - 
@article{
author = "Lazarević, Zorica Ž. and Jovalekic, Cedomir and Gilic, Martina and Ivanovski, Valentin N. and Umićević, Ana and Sekulić, Dalibor L. and Romčević, Nebojša Ž.",
year = "2017",
abstract = "Yttrium orthoferrite (YFeO3) powder was prepared by a mechanochemical synthesis from a mixture of Y2O3 and alpha-Fe2O3 powders in a planetary ball mill for 2.5 h. The obtained YFeO3 powder sample was characterized by X-ray diffraction (XRD), Raman and infrared spectroscopy. The average crystallite size calculated by the Scherrer equation was 12 nm. The Mossbauer spectroscopy at room temperature confirms the superparamagnetic character of YFeO3 orthoferrite sample.",
journal = "Science of Sintering",
title = "Yttrium Orthoferrite Powder Obtained by the Mechanochemical Synthesis",
volume = "49",
number = "3",
pages = "277-284",
doi = "10.2298/SOS1703277L"
}
Lazarević, Z. Ž., Jovalekic, C., Gilic, M., Ivanovski, V. N., Umićević, A., Sekulić, D. L.,& Romčević, N. Ž.. (2017). Yttrium Orthoferrite Powder Obtained by the Mechanochemical Synthesis. in Science of Sintering, 49(3), 277-284.
https://doi.org/10.2298/SOS1703277L
Lazarević ZŽ, Jovalekic C, Gilic M, Ivanovski VN, Umićević A, Sekulić DL, Romčević NŽ. Yttrium Orthoferrite Powder Obtained by the Mechanochemical Synthesis. in Science of Sintering. 2017;49(3):277-284.
doi:10.2298/SOS1703277L .
Lazarević, Zorica Ž., Jovalekic, Cedomir, Gilic, Martina, Ivanovski, Valentin N., Umićević, Ana, Sekulić, Dalibor L., Romčević, Nebojša Ž., "Yttrium Orthoferrite Powder Obtained by the Mechanochemical Synthesis" in Science of Sintering, 49, no. 3 (2017):277-284,
https://doi.org/10.2298/SOS1703277L . .
4
6
6

Improving the photocatalytic properties of anatase TiO2(101) surface by co-doping with Cu and N: Ab initio study

Koteski, Vasil J.; Belošević-Čavor, Jelena; Umićević, Ana; Ivanovski, Valentin N.; Toprek, Dragan

(2017)

TY  - JOUR
AU  - Koteski, Vasil J.
AU  - Belošević-Čavor, Jelena
AU  - Umićević, Ana
AU  - Ivanovski, Valentin N.
AU  - Toprek, Dragan
PY  - 2017
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1721
AB  - Substitutionally and interstitially Cu/Nco-doped anatase TiO2(101) surface is investigated by using density functional theory (DFT) calculations. The results suggest improved visible light photocatalytic activity over undoped anatase TiO2. Sizable lattice relaxation around the dopants is observed, followed by a formation of N-O bond. Depending on the local arrangement of atoms, localized states above the valence band maximum, deep into the band gap, and below the conduction band minimum are found. In addition, our calculation also predict band gap narrowing. The hybridization of the Cu 3d and N 2p states within the band gap and the other electronic and optical properties suggest a synergistic effect of the dopants in the enhancement of the visible light absorption on the (101) anatase surface. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Improving the photocatalytic properties of anatase TiO2(101) surface by co-doping with Cu and N: Ab initio study
VL  - 425
SP  - 1095
EP  - 1100
DO  - 10.1016/j.apsusc.2017.07.064
ER  - 
@article{
author = "Koteski, Vasil J. and Belošević-Čavor, Jelena and Umićević, Ana and Ivanovski, Valentin N. and Toprek, Dragan",
year = "2017",
abstract = "Substitutionally and interstitially Cu/Nco-doped anatase TiO2(101) surface is investigated by using density functional theory (DFT) calculations. The results suggest improved visible light photocatalytic activity over undoped anatase TiO2. Sizable lattice relaxation around the dopants is observed, followed by a formation of N-O bond. Depending on the local arrangement of atoms, localized states above the valence band maximum, deep into the band gap, and below the conduction band minimum are found. In addition, our calculation also predict band gap narrowing. The hybridization of the Cu 3d and N 2p states within the band gap and the other electronic and optical properties suggest a synergistic effect of the dopants in the enhancement of the visible light absorption on the (101) anatase surface. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Improving the photocatalytic properties of anatase TiO2(101) surface by co-doping with Cu and N: Ab initio study",
volume = "425",
pages = "1095-1100",
doi = "10.1016/j.apsusc.2017.07.064"
}
Koteski, V. J., Belošević-Čavor, J., Umićević, A., Ivanovski, V. N.,& Toprek, D.. (2017). Improving the photocatalytic properties of anatase TiO2(101) surface by co-doping with Cu and N: Ab initio study. in Applied Surface Science, 425, 1095-1100.
https://doi.org/10.1016/j.apsusc.2017.07.064
Koteski VJ, Belošević-Čavor J, Umićević A, Ivanovski VN, Toprek D. Improving the photocatalytic properties of anatase TiO2(101) surface by co-doping with Cu and N: Ab initio study. in Applied Surface Science. 2017;425:1095-1100.
doi:10.1016/j.apsusc.2017.07.064 .
Koteski, Vasil J., Belošević-Čavor, Jelena, Umićević, Ana, Ivanovski, Valentin N., Toprek, Dragan, "Improving the photocatalytic properties of anatase TiO2(101) surface by co-doping with Cu and N: Ab initio study" in Applied Surface Science, 425 (2017):1095-1100,
https://doi.org/10.1016/j.apsusc.2017.07.064 . .
7
8
9

Morphology and magnetic properties of the ethylene-co-vinyl acetate/iron nanocomposite films prepared by implantation with Fe6+ ions

Božanić, Dušan K.; Draganić, Ilija; Bibić, Nataša M.; Luyt, Adriaan S.; Konstantinović, Zorica; Đoković, Vladimir

(Elsevier, 2016)

TY  - JOUR
AU  - Božanić, Dušan K.
AU  - Draganić, Ilija
AU  - Bibić, Nataša M.
AU  - Luyt, Adriaan S.
AU  - Konstantinović, Zorica
AU  - Đoković, Vladimir
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1097
AB  - Ethylene-co-vinyl acetate/iron nanocomposite films were fabricated by implantation with multiple charged ions at different fluencies. The films obtained with ion fluency of 1 x 10(17) cm(-2) were used for specific studies. It was found that spherical similar to 1.5 nm diameter nanoparticles were formed upon implantation. They were clustered into a single 80 nm wide strip about 40 nm beneath the film surface. The magnetic measurements of the film showed that the particles exhibit superparamagnetic behavior with a blocking temperature below 5K. A second type of the samples was also prepared with ion fluency of 1 x 10(17) cm(-2), but prior to implantation, the iron was evaporated onto the co-polymer surface. A nanocomposite film of different morphology was obtained upon the implantation and the particles were much smaller (-0.8 nm). The magnetic behavior of both the films was that of isolated nanoparticles, despite the high ion fluency of 1 x 10(17) cm(-2). (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Morphology and magnetic properties of the ethylene-co-vinyl acetate/iron nanocomposite films prepared by implantation with Fe6+ ions
VL  - 378
SP  - 362
EP  - 367
DO  - 10.1016/j.apsusc.2016.04.020
ER  - 
@article{
author = "Božanić, Dušan K. and Draganić, Ilija and Bibić, Nataša M. and Luyt, Adriaan S. and Konstantinović, Zorica and Đoković, Vladimir",
year = "2016",
abstract = "Ethylene-co-vinyl acetate/iron nanocomposite films were fabricated by implantation with multiple charged ions at different fluencies. The films obtained with ion fluency of 1 x 10(17) cm(-2) were used for specific studies. It was found that spherical similar to 1.5 nm diameter nanoparticles were formed upon implantation. They were clustered into a single 80 nm wide strip about 40 nm beneath the film surface. The magnetic measurements of the film showed that the particles exhibit superparamagnetic behavior with a blocking temperature below 5K. A second type of the samples was also prepared with ion fluency of 1 x 10(17) cm(-2), but prior to implantation, the iron was evaporated onto the co-polymer surface. A nanocomposite film of different morphology was obtained upon the implantation and the particles were much smaller (-0.8 nm). The magnetic behavior of both the films was that of isolated nanoparticles, despite the high ion fluency of 1 x 10(17) cm(-2). (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Morphology and magnetic properties of the ethylene-co-vinyl acetate/iron nanocomposite films prepared by implantation with Fe6+ ions",
volume = "378",
pages = "362-367",
doi = "10.1016/j.apsusc.2016.04.020"
}
Božanić, D. K., Draganić, I., Bibić, N. M., Luyt, A. S., Konstantinović, Z.,& Đoković, V.. (2016). Morphology and magnetic properties of the ethylene-co-vinyl acetate/iron nanocomposite films prepared by implantation with Fe6+ ions. in Applied Surface Science
Elsevier., 378, 362-367.
https://doi.org/10.1016/j.apsusc.2016.04.020
Božanić DK, Draganić I, Bibić NM, Luyt AS, Konstantinović Z, Đoković V. Morphology and magnetic properties of the ethylene-co-vinyl acetate/iron nanocomposite films prepared by implantation with Fe6+ ions. in Applied Surface Science. 2016;378:362-367.
doi:10.1016/j.apsusc.2016.04.020 .
Božanić, Dušan K., Draganić, Ilija, Bibić, Nataša M., Luyt, Adriaan S., Konstantinović, Zorica, Đoković, Vladimir, "Morphology and magnetic properties of the ethylene-co-vinyl acetate/iron nanocomposite films prepared by implantation with Fe6+ ions" in Applied Surface Science, 378 (2016):362-367,
https://doi.org/10.1016/j.apsusc.2016.04.020 . .
2
2
2

Influence of Some Sol-Gel Synthesis Parameters of Mesoporous Tio2 on Photocatalytic Degradation of Pollutants

Golubović, Aleksandar V.; Veljkovic, Ivana; Šćepanović, Maja; Grujić-Brojčin, Mirjana; Tomic, Natasa; Mijin, Dušan Ž.; Babić, Biljana M.

(2016)

TY  - JOUR
AU  - Golubović, Aleksandar V.
AU  - Veljkovic, Ivana
AU  - Šćepanović, Maja
AU  - Grujić-Brojčin, Mirjana
AU  - Tomic, Natasa
AU  - Mijin, Dušan Ž.
AU  - Babić, Biljana M.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1020
AB  - Titanium dioxide (TiO2) nanopowders were produced by sol-gel technique from tetrabutyl titanate as a precursor by varying some parameters of the sol-gel synthesis, such as temperature (500 and 550 degrees C) and the duration of calcination (1.5, 2 and 2.5 h). X-ray powder diffraction (XRPD) results have shown that all synthesized nanopowders were dominantly in the anatase phase, with the presence of a small amount of rutile in samples calcined at 550 degrees C. According to the results obtained by the Williamson-Hall method, the anatase crystallite size was increased with the duration of the calcination (from 24 to 29 nm in samples calcined at lower temperature, and from 30 to 35 nm in samples calcined at higher temperature). The analysis of the shift and line-width of the most intensive anatase Eg Raman mode confirmed the XRPD results. The analysis of pore structure from nitrogen sorption experimental data described all samples as mesoporous, with mean pore diameters in the range of 5-8 nm. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the textile dye (C.I. Reactive Orange 16), car-bofuran ray scattering.
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Influence of Some Sol-Gel Synthesis Parameters of Mesoporous Tio2 on Photocatalytic Degradation of Pollutants
VL  - 22
IS  - 1
SP  - 65
EP  - 73
DO  - 10.2298/CICEQ150110020G
ER  - 
@article{
author = "Golubović, Aleksandar V. and Veljkovic, Ivana and Šćepanović, Maja and Grujić-Brojčin, Mirjana and Tomic, Natasa and Mijin, Dušan Ž. and Babić, Biljana M.",
year = "2016",
abstract = "Titanium dioxide (TiO2) nanopowders were produced by sol-gel technique from tetrabutyl titanate as a precursor by varying some parameters of the sol-gel synthesis, such as temperature (500 and 550 degrees C) and the duration of calcination (1.5, 2 and 2.5 h). X-ray powder diffraction (XRPD) results have shown that all synthesized nanopowders were dominantly in the anatase phase, with the presence of a small amount of rutile in samples calcined at 550 degrees C. According to the results obtained by the Williamson-Hall method, the anatase crystallite size was increased with the duration of the calcination (from 24 to 29 nm in samples calcined at lower temperature, and from 30 to 35 nm in samples calcined at higher temperature). The analysis of the shift and line-width of the most intensive anatase Eg Raman mode confirmed the XRPD results. The analysis of pore structure from nitrogen sorption experimental data described all samples as mesoporous, with mean pore diameters in the range of 5-8 nm. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the textile dye (C.I. Reactive Orange 16), car-bofuran ray scattering.",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Influence of Some Sol-Gel Synthesis Parameters of Mesoporous Tio2 on Photocatalytic Degradation of Pollutants",
volume = "22",
number = "1",
pages = "65-73",
doi = "10.2298/CICEQ150110020G"
}
Golubović, A. V., Veljkovic, I., Šćepanović, M., Grujić-Brojčin, M., Tomic, N., Mijin, D. Ž.,& Babić, B. M.. (2016). Influence of Some Sol-Gel Synthesis Parameters of Mesoporous Tio2 on Photocatalytic Degradation of Pollutants. in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 22(1), 65-73.
https://doi.org/10.2298/CICEQ150110020G
Golubović AV, Veljkovic I, Šćepanović M, Grujić-Brojčin M, Tomic N, Mijin DŽ, Babić BM. Influence of Some Sol-Gel Synthesis Parameters of Mesoporous Tio2 on Photocatalytic Degradation of Pollutants. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2016;22(1):65-73.
doi:10.2298/CICEQ150110020G .
Golubović, Aleksandar V., Veljkovic, Ivana, Šćepanović, Maja, Grujić-Brojčin, Mirjana, Tomic, Natasa, Mijin, Dušan Ž., Babić, Biljana M., "Influence of Some Sol-Gel Synthesis Parameters of Mesoporous Tio2 on Photocatalytic Degradation of Pollutants" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 22, no. 1 (2016):65-73,
https://doi.org/10.2298/CICEQ150110020G . .
2
3

Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration

Vranješ, Mila; Kuljanin-Jakovljević, Jadranka Ž.; Konstantinović, Zorica; Pomar, Alberto; Ahrenkiel, Scott Phillip; Radetic, Tamara; Stoiljković, Milovan; Mitrić, Miodrag; Šaponjić, Zoran

(Elsevier, 2016)

TY  - JOUR
AU  - Vranješ, Mila
AU  - Kuljanin-Jakovljević, Jadranka Ž.
AU  - Konstantinović, Zorica
AU  - Pomar, Alberto
AU  - Ahrenkiel, Scott Phillip
AU  - Radetic, Tamara
AU  - Stoiljković, Milovan
AU  - Mitrić, Miodrag
AU  - Šaponjić, Zoran
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1024
AB  - Cu2+ doped TiO2 nanocrystals were synthesized using dispersions of titania nanotubes in the presence of Cu2+ ions as a precursors. The morphologies of nanotubular titania precursors and resulted Cu2+ doped TiO2 nanocrystals were characterized by TEM. Structural and optical properties were studied by XRPD analysis and UV-vis spectroscopy in reflectance mode, respectively. Their magnetic properties were investigated using SQUID magnetometer. Tetragonal anatase crystalline structure was confirmed in all synthesized samples. Polygonal (d similar to 15 nm) and spheroid like (length, up to 90 nm) Cu2+ doped TiO2 nanocrystals in samples synthesized at different pHs were observed by TEM. Ferromagnetic ordering with almost closed loop (H-c similar to 200 Oe) was detected in all Cu2+ doped TiO2 nanoparticle films. The saturation magnetization values varied depending on the Cu2+ concentration, nanoparticles shape, size and consequently different number of oxygen vacancies. This study revealed possibility to control magnetic ordering by changing the shape/aspect ratio of Cu2+ doped TiO2 nanocrystals. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Materials Research Bulletin
T1  - Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration
VL  - 76
SP  - 100
EP  - 106
DO  - 10.1016/j.materresbull.2015.11.051
ER  - 
@article{
author = "Vranješ, Mila and Kuljanin-Jakovljević, Jadranka Ž. and Konstantinović, Zorica and Pomar, Alberto and Ahrenkiel, Scott Phillip and Radetic, Tamara and Stoiljković, Milovan and Mitrić, Miodrag and Šaponjić, Zoran",
year = "2016",
abstract = "Cu2+ doped TiO2 nanocrystals were synthesized using dispersions of titania nanotubes in the presence of Cu2+ ions as a precursors. The morphologies of nanotubular titania precursors and resulted Cu2+ doped TiO2 nanocrystals were characterized by TEM. Structural and optical properties were studied by XRPD analysis and UV-vis spectroscopy in reflectance mode, respectively. Their magnetic properties were investigated using SQUID magnetometer. Tetragonal anatase crystalline structure was confirmed in all synthesized samples. Polygonal (d similar to 15 nm) and spheroid like (length, up to 90 nm) Cu2+ doped TiO2 nanocrystals in samples synthesized at different pHs were observed by TEM. Ferromagnetic ordering with almost closed loop (H-c similar to 200 Oe) was detected in all Cu2+ doped TiO2 nanoparticle films. The saturation magnetization values varied depending on the Cu2+ concentration, nanoparticles shape, size and consequently different number of oxygen vacancies. This study revealed possibility to control magnetic ordering by changing the shape/aspect ratio of Cu2+ doped TiO2 nanocrystals. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Research Bulletin",
title = "Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration",
volume = "76",
pages = "100-106",
doi = "10.1016/j.materresbull.2015.11.051"
}
Vranješ, M., Kuljanin-Jakovljević, J. Ž., Konstantinović, Z., Pomar, A., Ahrenkiel, S. P., Radetic, T., Stoiljković, M., Mitrić, M.,& Šaponjić, Z.. (2016). Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration. in Materials Research Bulletin
Elsevier., 76, 100-106.
https://doi.org/10.1016/j.materresbull.2015.11.051
Vranješ M, Kuljanin-Jakovljević JŽ, Konstantinović Z, Pomar A, Ahrenkiel SP, Radetic T, Stoiljković M, Mitrić M, Šaponjić Z. Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration. in Materials Research Bulletin. 2016;76:100-106.
doi:10.1016/j.materresbull.2015.11.051 .
Vranješ, Mila, Kuljanin-Jakovljević, Jadranka Ž., Konstantinović, Zorica, Pomar, Alberto, Ahrenkiel, Scott Phillip, Radetic, Tamara, Stoiljković, Milovan, Mitrić, Miodrag, Šaponjić, Zoran, "Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration" in Materials Research Bulletin, 76 (2016):100-106,
https://doi.org/10.1016/j.materresbull.2015.11.051 . .
7
7
7

WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties

Dohčević-Mitrović, Zorana ; Stojadinovic, Stevan; Lozzi, Luca; Askrabic, Sonja; Rosić, Milena; Tomic, Natasa; Paunović, Novica M.; Lazovic, Sasa; Nikolic, Marko G.; Santucci, Sandro

(2016)

TY  - JOUR
AU  - Dohčević-Mitrović, Zorana 
AU  - Stojadinovic, Stevan
AU  - Lozzi, Luca
AU  - Askrabic, Sonja
AU  - Rosić, Milena
AU  - Tomic, Natasa
AU  - Paunović, Novica M.
AU  - Lazovic, Sasa
AU  - Nikolic, Marko G.
AU  - Santucci, Sandro
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1234
AB  - WO3/TiO2 and TiO2 coatings were prepared on titania substrates using facile and cost-effective plasma electrolytic oxidation process. The coatings were characterized by X-ray diffraction, scanning electron microscopy, Raman, UV vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. With increasing duration of PEO process, the monoclinic WO3 phase became dominant and new monoclinic WO2.95 phase appeared. The optical absorption edge in the WO3/TiO2 samples, enriched with WO3/WO2.96 phase, was shifted to the visible region. The photocatalytic efficiency of WO3/TiO2 and pure TiO2 samples was evaluated by performing the photodegradation experiments in an aqueous solution of Rhodamine 6G and Mordant Blue 9 under the visible and UV light. The WO3/TiO2 catalysts are much more efficient than pure TiO2 under visible light and slightly better under UV light. The improvement of photocatalytic activity in the visible region is attributed to better light absorption, higher adsorption affinity and increased charge separation efficiency. (C) 2016 Elsevier Ltd. All rights reserved.
T2  - Materials Research Bulletin
T1  - WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties
VL  - 83
SP  - 217
EP  - 224
DO  - 10.1016/j.materresbull.2016.06.011
ER  - 
@article{
author = "Dohčević-Mitrović, Zorana  and Stojadinovic, Stevan and Lozzi, Luca and Askrabic, Sonja and Rosić, Milena and Tomic, Natasa and Paunović, Novica M. and Lazovic, Sasa and Nikolic, Marko G. and Santucci, Sandro",
year = "2016",
abstract = "WO3/TiO2 and TiO2 coatings were prepared on titania substrates using facile and cost-effective plasma electrolytic oxidation process. The coatings were characterized by X-ray diffraction, scanning electron microscopy, Raman, UV vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. With increasing duration of PEO process, the monoclinic WO3 phase became dominant and new monoclinic WO2.95 phase appeared. The optical absorption edge in the WO3/TiO2 samples, enriched with WO3/WO2.96 phase, was shifted to the visible region. The photocatalytic efficiency of WO3/TiO2 and pure TiO2 samples was evaluated by performing the photodegradation experiments in an aqueous solution of Rhodamine 6G and Mordant Blue 9 under the visible and UV light. The WO3/TiO2 catalysts are much more efficient than pure TiO2 under visible light and slightly better under UV light. The improvement of photocatalytic activity in the visible region is attributed to better light absorption, higher adsorption affinity and increased charge separation efficiency. (C) 2016 Elsevier Ltd. All rights reserved.",
journal = "Materials Research Bulletin",
title = "WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties",
volume = "83",
pages = "217-224",
doi = "10.1016/j.materresbull.2016.06.011"
}
Dohčević-Mitrović, Z., Stojadinovic, S., Lozzi, L., Askrabic, S., Rosić, M., Tomic, N., Paunović, N. M., Lazovic, S., Nikolic, M. G.,& Santucci, S.. (2016). WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties. in Materials Research Bulletin, 83, 217-224.
https://doi.org/10.1016/j.materresbull.2016.06.011
Dohčević-Mitrović Z, Stojadinovic S, Lozzi L, Askrabic S, Rosić M, Tomic N, Paunović NM, Lazovic S, Nikolic MG, Santucci S. WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties. in Materials Research Bulletin. 2016;83:217-224.
doi:10.1016/j.materresbull.2016.06.011 .
Dohčević-Mitrović, Zorana , Stojadinovic, Stevan, Lozzi, Luca, Askrabic, Sonja, Rosić, Milena, Tomic, Natasa, Paunović, Novica M., Lazovic, Sasa, Nikolic, Marko G., Santucci, Sandro, "WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties" in Materials Research Bulletin, 83 (2016):217-224,
https://doi.org/10.1016/j.materresbull.2016.06.011 . .
1
41
34
41

Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites

Marković, Smilja ; Rajić, Vladimir; Stanković, Ana; Veselinović, Ljiljana; Belošević-Čavor, Jelena; Batalović, Katarina; Abazović, Nadica; Škapin, Srečo Davor; Uskoković, Dragan

(Elsevier, 2016)

TY  - JOUR
AU  - Marković, Smilja 
AU  - Rajić, Vladimir
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Belošević-Čavor, Jelena
AU  - Batalović, Katarina
AU  - Abazović, Nadica
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/963
AB  - ZnO spheroidal nanoparticles, synthesized by microwave processing, were used for preparation of composites with polyethylene oxide (PEO). The phase purity and crystal structure of the composites were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The composites particles morphology and size distributions were studied by FE-SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV Vis diffuse reflectance and photoluminescence spectroscopy. It is found that in the wavelength range 550-800 nm, ZnO and ZnO/PEO composites absorb about 50% of the incident light intensity. Also red-shift of band gap energy (0.12-0.15 eV) compared to bulk ZnO was determined. The effect of PEO molecular weights, 200,000, 600,000 and 900,000 g/mol, on photocatalytic activity of ZnO/PEO composites were examined via de-colorization of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB de-colorization was found after 6 h of irradiation. The enhanced photocatalytic activity of ZnO/PEO composites is attributed to the: (1) lattice defects introduced in ZnO crystal structure by rapid microwave processing, and (2) presence of PEO as a source of oxygen interstitials. In order to confirm and further clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed. (C) 2016 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Solar Energy
T1  - Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites
VL  - 127
SP  - 124
EP  - 135
DO  - 10.1016/j.solener.2016.01.026
ER  - 
@article{
author = "Marković, Smilja  and Rajić, Vladimir and Stanković, Ana and Veselinović, Ljiljana and Belošević-Čavor, Jelena and Batalović, Katarina and Abazović, Nadica and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2016",
abstract = "ZnO spheroidal nanoparticles, synthesized by microwave processing, were used for preparation of composites with polyethylene oxide (PEO). The phase purity and crystal structure of the composites were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The composites particles morphology and size distributions were studied by FE-SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV Vis diffuse reflectance and photoluminescence spectroscopy. It is found that in the wavelength range 550-800 nm, ZnO and ZnO/PEO composites absorb about 50% of the incident light intensity. Also red-shift of band gap energy (0.12-0.15 eV) compared to bulk ZnO was determined. The effect of PEO molecular weights, 200,000, 600,000 and 900,000 g/mol, on photocatalytic activity of ZnO/PEO composites were examined via de-colorization of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB de-colorization was found after 6 h of irradiation. The enhanced photocatalytic activity of ZnO/PEO composites is attributed to the: (1) lattice defects introduced in ZnO crystal structure by rapid microwave processing, and (2) presence of PEO as a source of oxygen interstitials. In order to confirm and further clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed. (C) 2016 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Solar Energy",
title = "Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites",
volume = "127",
pages = "124-135",
doi = "10.1016/j.solener.2016.01.026"
}
Marković, S., Rajić, V., Stanković, A., Veselinović, L., Belošević-Čavor, J., Batalović, K., Abazović, N., Škapin, S. D.,& Uskoković, D.. (2016). Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites. in Solar Energy
Elsevier., 127, 124-135.
https://doi.org/10.1016/j.solener.2016.01.026
Marković S, Rajić V, Stanković A, Veselinović L, Belošević-Čavor J, Batalović K, Abazović N, Škapin SD, Uskoković D. Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites. in Solar Energy. 2016;127:124-135.
doi:10.1016/j.solener.2016.01.026 .
Marković, Smilja , Rajić, Vladimir, Stanković, Ana, Veselinović, Ljiljana, Belošević-Čavor, Jelena, Batalović, Katarina, Abazović, Nadica, Škapin, Srečo Davor, Uskoković, Dragan, "Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites" in Solar Energy, 127 (2016):124-135,
https://doi.org/10.1016/j.solener.2016.01.026 . .
8
10
10

Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters

Toprek, Dragan; Koteski, Vasil J.

(Elsevier, 2016)

TY  - JOUR
AU  - Toprek, Dragan
AU  - Koteski, Vasil J.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/981
AB  - The stability and structure of titanium doped gold clusters (AunTi; n = 1-32) are studied by density functional theory calculations, as implemented in the first principles code SIESTA. The exchange and correlation effects were calculated within the generalized gradient approximation (GGA) parametrized by Perdew, Burke and Ernzerhof (PBE). We used norm conserving Troullier-Martins pseudopotentials for the 10-electron valence configuration of Ti and 11-electron valence configuration of Au. All calculations were spin-polarized. The global energy minimum geometries of the clusters were searched for by using the simulated annealing technique. The stability of the clusters is discussed on the basis of the binding energy per atom, second-order energy difference, vertical ionization potential, vertical electron affinities, HOMO-LUMO energy gap and vibrational frequencies. Based on the simultaneous criteria of high binding energy, high band gap, high vertical ionization potential, and low electron affinity, it is found that Au4Ti and Au14Ti clusters have a higher stability and are candidates for magic clusters, which confirms the already known results from previous works. The new result presented in this paper is that the Au20Ti and Au30Ti clusters have a higher stability too. In general, the clusters with even n are more stable than the clusters with odd n. Most of the clusters with even n are non-magnetic (total magnetic moment is zero). Our results also suggest that only the Au3Ti, Au7Ti and Au8Ti clusters have a planar structure. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Computational and Theoretical Chemistry
T1  - Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters
VL  - 1081
SP  - 9
EP  - 17
DO  - 10.1016/j.comptc.2016.02.005
ER  - 
@article{
author = "Toprek, Dragan and Koteski, Vasil J.",
year = "2016",
abstract = "The stability and structure of titanium doped gold clusters (AunTi; n = 1-32) are studied by density functional theory calculations, as implemented in the first principles code SIESTA. The exchange and correlation effects were calculated within the generalized gradient approximation (GGA) parametrized by Perdew, Burke and Ernzerhof (PBE). We used norm conserving Troullier-Martins pseudopotentials for the 10-electron valence configuration of Ti and 11-electron valence configuration of Au. All calculations were spin-polarized. The global energy minimum geometries of the clusters were searched for by using the simulated annealing technique. The stability of the clusters is discussed on the basis of the binding energy per atom, second-order energy difference, vertical ionization potential, vertical electron affinities, HOMO-LUMO energy gap and vibrational frequencies. Based on the simultaneous criteria of high binding energy, high band gap, high vertical ionization potential, and low electron affinity, it is found that Au4Ti and Au14Ti clusters have a higher stability and are candidates for magic clusters, which confirms the already known results from previous works. The new result presented in this paper is that the Au20Ti and Au30Ti clusters have a higher stability too. In general, the clusters with even n are more stable than the clusters with odd n. Most of the clusters with even n are non-magnetic (total magnetic moment is zero). Our results also suggest that only the Au3Ti, Au7Ti and Au8Ti clusters have a planar structure. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Computational and Theoretical Chemistry",
title = "Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters",
volume = "1081",
pages = "9-17",
doi = "10.1016/j.comptc.2016.02.005"
}
Toprek, D.,& Koteski, V. J.. (2016). Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters. in Computational and Theoretical Chemistry
Elsevier., 1081, 9-17.
https://doi.org/10.1016/j.comptc.2016.02.005
Toprek D, Koteski VJ. Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters. in Computational and Theoretical Chemistry. 2016;1081:9-17.
doi:10.1016/j.comptc.2016.02.005 .
Toprek, Dragan, Koteski, Vasil J., "Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters" in Computational and Theoretical Chemistry, 1081 (2016):9-17,
https://doi.org/10.1016/j.comptc.2016.02.005 . .
8
9
9

Истраживање структуре и хиперфиних интеракција у интерметалној y'-Ni3Al фази са примесама хафнијума и гвожђа

Ivanovski, Valentin N.

(Универзитет у Београду, Физички факултет, 2015)

TY  - THES
AU  - Ivanovski, Valentin N.
PY  - 2015
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=3175
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:11524/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=47674639
UR  - http://nardus.mpn.gov.rs/123456789/5910
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7291
AB  - У овом раду истраживана су поликристална интерметална једињења γ′–Ni3Al са примесама атома хафнијума и γ′–Ni3Al са примесама атома гвожђа. Испитивања локалне структуре, магнетних и електричних особина γ′–Ni3Al једињења допираних атомима Hf или атомима Fe извршена су методама дифракције Х–зрачења, мерењима магнетизације, као и применом временски разложених пертурбованих угаоних корелација и спектроскопије Mössbauer–овог ефекта, које су омогућиле истраживања хиперфиних интеракција на језгрима примеса Hf и на језгрима примеса Fe. Ова експериментална истраживања испитиваних система су употпуњена прорачунима енергије дефеката, као и параметара структуре и хиперфиних интеракција на основу првих принципа. Главни циљ експерименталних истраживања и теоријских прорачуна интерметалне γ′– Ni3Al фазе са примесама атома хафнијума, односно гвожђа био је да се одреди преферентно позиционирање атома Hf, односно атома Fe у γ′–Ni3Al решетки, као и њихов утицај на кристалну решетку у коју се уграђују. Aнализoм дифракције Х–зрака испитиваних Hf допираних Ni3Al узорака утврђено је присуство кубне γ′ фазе (ознака L12) у испитиваним Hf–Ni3Al легурама, као и њене две тетрагоналне трансформације L60 и D022. Анализа је показала да је кубна L12 фаза доминантна у односу на тетрагоналне фазе испитиваних Hf–Ni3Al узорака. Мерења хиперфиних интеракција на проби 181Та, језгру–потомку 181Hf, у легурама 0.2, 0.5 и 5 at.% Hf – Ni3Al извршена су у температурском опсегу од 78 K до 1230 K. Измерене вредности хиперфиних параметара приписане су одређеним позицијама атома Hf у присутним Ni3Al фазама: L12, D022 и L60. Присуствo 181Ta–сигнала који је константан у времену кореспондира атомима Hf на позицији Al атома у доминантној L12 фази. За све три испитиване легуре, измерена нижа вредност спин независне електричнеiiiквадруполне фреквенције додељена је електричној квадруполној интеракцији којадејствује на атоме Hf који су заменили атоме Al у тетрагоналној D022 фази.Измерена виша вредност фреквенције кореспондира атомима Hf на позицијамаатома Al у тетрагоналној L60 фази.Резултати прорачуна параметара хиперфиних интеракција, електронских иструктурних особина Hf–Ni3Al легура из првих принципа изведених методомпроширених равних таласа са локалним орбиталама коришћењем WIEN2k (“AnAugmented Plane Wave Plus Local Orbitals Program”) кода коректно репродукујувредности добијене у експерименталним мерењима. Прорачуни енергије дефекатабазирани на теорији функционала густине изведени су VASP (“the Vienna ab–initiosimulation package”) кодом. Прорачунате електронске структуре проба уразматрању са тачкастим групама симетрије њихових позиција помогли су уидентификовању порекла хиперфиних интеракција и утврдили да је преферентнапозиција хафнијума на позицији коју заузимају атоми Al у Ni3Al.Карактеризација узорака γ′–Ni3Al допираних гвожђем извршена једифракцијом Х–зрачења и мерењима магнетизације. Локална електронска имагнетна структура, хиперфине интеракције пробе 57Fe, као и фазни састав легураNi2.82Fe0.18Al и Ni2.64Fe0.36Al истражени су спектроскопијом Mössbauеr–овогефекта. Резултати прорачуна електронских особина Fe–Ni3Al легура из првихпринципа методом пројектора проширених таласа као и резултати прорачунаенергије дефеката објашњавају електронску структуру, хиперфине интеракције ипреферентну позицију атома Fe у легури γ′–Ni3Al са мањком никла. Вредностизрачунате највеће компоненте тензора градијента електричног поља, Vzz = 1.61021 Vm-2 на основу вредности параметара добијених из Mössbauеr–ових спектара,указује да у обе испитиване легуре атоми гвожђа замењују атоме никла у γ′–Ni3Al.
AB  - The dissertation addresses the local crystal structure and hyperfine interactions of hafnium or iron doped polycrystalline intermatallic γ′–Ni3Al alloys.The local structure, magnetic and electrical properties of γ′–Ni3Al compounds doped with Hf atoms or Fe atoms were investigated by the X ray diffraction, magnetization, time differential perturbed angular correlation spectroscopy and Mössbauer–effect spectroscopy. The last two experimental methods provided insight into hyperfine interactions of Hf– and Fe–nucleus. This was complemented by the calculations of the energy of the defects, as well as with ab initio calculations of structural and hyperfine interactions parameters.The main goal of the experimental and theoretical investigations of the intermetallic γ′–Ni3Al phase doped with Hf or Fe atoms was to determine the site preference of dopant atoms in the γ′–Ni3Al matrix, as well as their influence on the host lattice.The X–ray diffraction measurements of the Hf doped Ni3Al samples revealed the presence of the cubic γ′ phase (usually denoted by L12) and its two tetragonal distortions: D022 and L60. The refinement of XRD data showed the dominant presence of the cubic L12 phase in the Hf–Ni3Al samples, with the minority presence of the two tetragonal phases. The measurements of the hyperfine interactions of the 181Та–probe in the 0.2, 0.5 and 5 at.% Hf – Ni3Al alloys (181Та–nucleus is the daughter–nucleus of the 181Hf–parent nucleus) were done in the temperature range 78 K to 1230 K. The measured hyperfine parameters values were assigned to the various Hf atom sites in the different crystal structures (cubic and tetragonal) present in the Ni3Al alloys. The presence of 181Та–signal constant in time is ascribed to Hf atoms at the Al sites in dominant L12 phase. For all investigated alloys, the lower value of the spin independent electric quadrupole frequency was ascribed to the electric quadrupole interaction of the Hf nuclei substituting on the Al sites in the tetragonal D022 phase in the Hf–Ni3Al valloys. The higher value of the spin independent electric quadrupole frequency corresponded to the electric quadrupole interactions of the Hf nuclei substituting on the Al sites in the tetragonal L60 phase in the Hf–Ni3Al alloys.The ab initio calculations of electronic and structural properties and hyperfine parameters of the 181Ta ion probe in the Hf–Ni3Al alloys, performed using the full potential augmented plane wave plus local–orbital method as implemented in the WIEN2k code, correctly reproduce the experimental results. The DFT (density functional theory) calculations of point defect energies were done by using the Vienna ab initio simulation package VASP. The ab initio calculations enable discussion on the structural and electronic properties of the Ni3Al polycrystalline alloys.The joint experimental and theoretical investigations enabled us to identify the observed hyperfine interactions and showed that hafnium additions prefer aluminum sites in Ni3Al.The structural and magnetic characterizations of the Fe doped γ′–Ni3Al samples were done by the X–ray diffraction and magnetization measurements. The local electronic and magnetic structure, the hyperfine interactions of the 57Fe–probes, as well as the phase composition of the Ni2.82Fe0.18Al and Ni2.64Fe0.36Al alloys were investigated by means of the Mössbauer–effect spectroscopy. The ab initio calculations performed with the projector augmented wave method and the calculations of the energies of iron point defects were done to elucidate the electronic structure, the hyperfine interactions and site preference of Fe doped Ni–deficit γ′–Ni3Al. The value of calculated electric field gradient tensor Vzz = 1.6 1021 Vm-2 matches well with the results of Mössbauer spectroscopy and indicates weak preference of iron dopant atoms for Ni sites.
PB  - Универзитет у Београду, Физички факултет
T2  - Универзитет у Београду
T1  - Истраживање структуре и хиперфиних интеракција у интерметалној y'-Ni3Al фази са примесама хафнијума и гвожђа
T1  - Investigation of the structure and hyperfine interactions in the intermetallic y'-Ni3Al phase doped with hafnium and iron
ER  - 
@phdthesis{
author = "Ivanovski, Valentin N.",
year = "2015",
abstract = "У овом раду истраживана су поликристална интерметална једињења γ′–Ni3Al са примесама атома хафнијума и γ′–Ni3Al са примесама атома гвожђа. Испитивања локалне структуре, магнетних и електричних особина γ′–Ni3Al једињења допираних атомима Hf или атомима Fe извршена су методама дифракције Х–зрачења, мерењима магнетизације, као и применом временски разложених пертурбованих угаоних корелација и спектроскопије Mössbauer–овог ефекта, које су омогућиле истраживања хиперфиних интеракција на језгрима примеса Hf и на језгрима примеса Fe. Ова експериментална истраживања испитиваних система су употпуњена прорачунима енергије дефеката, као и параметара структуре и хиперфиних интеракција на основу првих принципа. Главни циљ експерименталних истраживања и теоријских прорачуна интерметалне γ′– Ni3Al фазе са примесама атома хафнијума, односно гвожђа био је да се одреди преферентно позиционирање атома Hf, односно атома Fe у γ′–Ni3Al решетки, као и њихов утицај на кристалну решетку у коју се уграђују. Aнализoм дифракције Х–зрака испитиваних Hf допираних Ni3Al узорака утврђено је присуство кубне γ′ фазе (ознака L12) у испитиваним Hf–Ni3Al легурама, као и њене две тетрагоналне трансформације L60 и D022. Анализа је показала да је кубна L12 фаза доминантна у односу на тетрагоналне фазе испитиваних Hf–Ni3Al узорака. Мерења хиперфиних интеракција на проби 181Та, језгру–потомку 181Hf, у легурама 0.2, 0.5 и 5 at.% Hf – Ni3Al извршена су у температурском опсегу од 78 K до 1230 K. Измерене вредности хиперфиних параметара приписане су одређеним позицијама атома Hf у присутним Ni3Al фазама: L12, D022 и L60. Присуствo 181Ta–сигнала који је константан у времену кореспондира атомима Hf на позицији Al атома у доминантној L12 фази. За све три испитиване легуре, измерена нижа вредност спин независне електричнеiiiквадруполне фреквенције додељена је електричној квадруполној интеракцији којадејствује на атоме Hf који су заменили атоме Al у тетрагоналној D022 фази.Измерена виша вредност фреквенције кореспондира атомима Hf на позицијамаатома Al у тетрагоналној L60 фази.Резултати прорачуна параметара хиперфиних интеракција, електронских иструктурних особина Hf–Ni3Al легура из првих принципа изведених методомпроширених равних таласа са локалним орбиталама коришћењем WIEN2k (“AnAugmented Plane Wave Plus Local Orbitals Program”) кода коректно репродукујувредности добијене у експерименталним мерењима. Прорачуни енергије дефекатабазирани на теорији функционала густине изведени су VASP (“the Vienna ab–initiosimulation package”) кодом. Прорачунате електронске структуре проба уразматрању са тачкастим групама симетрије њихових позиција помогли су уидентификовању порекла хиперфиних интеракција и утврдили да је преферентнапозиција хафнијума на позицији коју заузимају атоми Al у Ni3Al.Карактеризација узорака γ′–Ni3Al допираних гвожђем извршена једифракцијом Х–зрачења и мерењима магнетизације. Локална електронска имагнетна структура, хиперфине интеракције пробе 57Fe, као и фазни састав легураNi2.82Fe0.18Al и Ni2.64Fe0.36Al истражени су спектроскопијом Mössbauеr–овогефекта. Резултати прорачуна електронских особина Fe–Ni3Al легура из првихпринципа методом пројектора проширених таласа као и резултати прорачунаенергије дефеката објашњавају електронску структуру, хиперфине интеракције ипреферентну позицију атома Fe у легури γ′–Ni3Al са мањком никла. Вредностизрачунате највеће компоненте тензора градијента електричног поља, Vzz = 1.61021 Vm-2 на основу вредности параметара добијених из Mössbauеr–ових спектара,указује да у обе испитиване легуре атоми гвожђа замењују атоме никла у γ′–Ni3Al., The dissertation addresses the local crystal structure and hyperfine interactions of hafnium or iron doped polycrystalline intermatallic γ′–Ni3Al alloys.The local structure, magnetic and electrical properties of γ′–Ni3Al compounds doped with Hf atoms or Fe atoms were investigated by the X ray diffraction, magnetization, time differential perturbed angular correlation spectroscopy and Mössbauer–effect spectroscopy. The last two experimental methods provided insight into hyperfine interactions of Hf– and Fe–nucleus. This was complemented by the calculations of the energy of the defects, as well as with ab initio calculations of structural and hyperfine interactions parameters.The main goal of the experimental and theoretical investigations of the intermetallic γ′–Ni3Al phase doped with Hf or Fe atoms was to determine the site preference of dopant atoms in the γ′–Ni3Al matrix, as well as their influence on the host lattice.The X–ray diffraction measurements of the Hf doped Ni3Al samples revealed the presence of the cubic γ′ phase (usually denoted by L12) and its two tetragonal distortions: D022 and L60. The refinement of XRD data showed the dominant presence of the cubic L12 phase in the Hf–Ni3Al samples, with the minority presence of the two tetragonal phases. The measurements of the hyperfine interactions of the 181Та–probe in the 0.2, 0.5 and 5 at.% Hf – Ni3Al alloys (181Та–nucleus is the daughter–nucleus of the 181Hf–parent nucleus) were done in the temperature range 78 K to 1230 K. The measured hyperfine parameters values were assigned to the various Hf atom sites in the different crystal structures (cubic and tetragonal) present in the Ni3Al alloys. The presence of 181Та–signal constant in time is ascribed to Hf atoms at the Al sites in dominant L12 phase. For all investigated alloys, the lower value of the spin independent electric quadrupole frequency was ascribed to the electric quadrupole interaction of the Hf nuclei substituting on the Al sites in the tetragonal D022 phase in the Hf–Ni3Al valloys. The higher value of the spin independent electric quadrupole frequency corresponded to the electric quadrupole interactions of the Hf nuclei substituting on the Al sites in the tetragonal L60 phase in the Hf–Ni3Al alloys.The ab initio calculations of electronic and structural properties and hyperfine parameters of the 181Ta ion probe in the Hf–Ni3Al alloys, performed using the full potential augmented plane wave plus local–orbital method as implemented in the WIEN2k code, correctly reproduce the experimental results. The DFT (density functional theory) calculations of point defect energies were done by using the Vienna ab initio simulation package VASP. The ab initio calculations enable discussion on the structural and electronic properties of the Ni3Al polycrystalline alloys.The joint experimental and theoretical investigations enabled us to identify the observed hyperfine interactions and showed that hafnium additions prefer aluminum sites in Ni3Al.The structural and magnetic characterizations of the Fe doped γ′–Ni3Al samples were done by the X–ray diffraction and magnetization measurements. The local electronic and magnetic structure, the hyperfine interactions of the 57Fe–probes, as well as the phase composition of the Ni2.82Fe0.18Al and Ni2.64Fe0.36Al alloys were investigated by means of the Mössbauer–effect spectroscopy. The ab initio calculations performed with the projector augmented wave method and the calculations of the energies of iron point defects were done to elucidate the electronic structure, the hyperfine interactions and site preference of Fe doped Ni–deficit γ′–Ni3Al. The value of calculated electric field gradient tensor Vzz = 1.6 1021 Vm-2 matches well with the results of Mössbauer spectroscopy and indicates weak preference of iron dopant atoms for Ni sites.",
publisher = "Универзитет у Београду, Физички факултет",
journal = "Универзитет у Београду",
title = "Истраживање структуре и хиперфиних интеракција у интерметалној y'-Ni3Al фази са примесама хафнијума и гвожђа, Investigation of the structure and hyperfine interactions in the intermetallic y'-Ni3Al phase doped with hafnium and iron"
}
Ivanovski, V. N.. (2015). Истраживање структуре и хиперфиних интеракција у интерметалној y'-Ni3Al фази са примесама хафнијума и гвожђа. in Универзитет у Београду
Универзитет у Београду, Физички факултет..
Ivanovski VN. Истраживање структуре и хиперфиних интеракција у интерметалној y'-Ni3Al фази са примесама хафнијума и гвожђа. in Универзитет у Београду. 2015;..
Ivanovski, Valentin N., "Истраживање структуре и хиперфиних интеракција у интерметалној y'-Ni3Al фази са примесама хафнијума и гвожђа" in Универзитет у Београду (2015).

Synthesis of Anatase Nanopowders by Sol-gel Method and Influence of Temperatures of Calcination to Their Photocatalitic Properties

Golubović, Aleksandar V.; Simović, Bojana; Šćepanović, Maja; Mijin, Dušan Ž.; Matkovic, A.; Grujić-Brojčin, Mirjana; Babić, Biljana M.

(2015)

TY  - JOUR
AU  - Golubović, Aleksandar V.
AU  - Simović, Bojana
AU  - Šćepanović, Maja
AU  - Mijin, Dušan Ž.
AU  - Matkovic, A.
AU  - Grujić-Brojčin, Mirjana
AU  - Babić, Biljana M.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/566
AB  - The titanium dioxide (TiO2) nanopowders were produced by sol-gel technique from tetrabutyl titanate as a precursor, varying the temperature of calcination (from 500 to 550 degrees C with the step of 10 degrees C). XRPD results have shown that all synthesized nanopowders are dominantly in anatase phase. The analysis of the shift and linewidth of the most intensive anatase E-g Raman mode confirmed the XRPD results and added the presence of small amount of highly disordered brookite phase in all samples. The analysis of pore structure from nitrogen sorption experimental data described all samples as mesoporous, with mean pore diameters in the range of 1.5 and 4.5 nm. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the textile dye (C.I. Reactive Orange 16). The sample calcined at temperature of 510 degrees C showed the best photocatalytic performance.
T2  - Science of Sintering
T1  - Synthesis of Anatase Nanopowders by Sol-gel Method and Influence of Temperatures of Calcination to Their Photocatalitic Properties
VL  - 47
IS  - 1
SP  - 41
EP  - 49
DO  - 10.2298/SOS1501041G
ER  - 
@article{
author = "Golubović, Aleksandar V. and Simović, Bojana and Šćepanović, Maja and Mijin, Dušan Ž. and Matkovic, A. and Grujić-Brojčin, Mirjana and Babić, Biljana M.",
year = "2015",
abstract = "The titanium dioxide (TiO2) nanopowders were produced by sol-gel technique from tetrabutyl titanate as a precursor, varying the temperature of calcination (from 500 to 550 degrees C with the step of 10 degrees C). XRPD results have shown that all synthesized nanopowders are dominantly in anatase phase. The analysis of the shift and linewidth of the most intensive anatase E-g Raman mode confirmed the XRPD results and added the presence of small amount of highly disordered brookite phase in all samples. The analysis of pore structure from nitrogen sorption experimental data described all samples as mesoporous, with mean pore diameters in the range of 1.5 and 4.5 nm. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the textile dye (C.I. Reactive Orange 16). The sample calcined at temperature of 510 degrees C showed the best photocatalytic performance.",
journal = "Science of Sintering",
title = "Synthesis of Anatase Nanopowders by Sol-gel Method and Influence of Temperatures of Calcination to Their Photocatalitic Properties",
volume = "47",
number = "1",
pages = "41-49",
doi = "10.2298/SOS1501041G"
}
Golubović, A. V., Simović, B., Šćepanović, M., Mijin, D. Ž., Matkovic, A., Grujić-Brojčin, M.,& Babić, B. M.. (2015). Synthesis of Anatase Nanopowders by Sol-gel Method and Influence of Temperatures of Calcination to Their Photocatalitic Properties. in Science of Sintering, 47(1), 41-49.
https://doi.org/10.2298/SOS1501041G
Golubović AV, Simović B, Šćepanović M, Mijin DŽ, Matkovic A, Grujić-Brojčin M, Babić BM. Synthesis of Anatase Nanopowders by Sol-gel Method and Influence of Temperatures of Calcination to Their Photocatalitic Properties. in Science of Sintering. 2015;47(1):41-49.
doi:10.2298/SOS1501041G .
Golubović, Aleksandar V., Simović, Bojana, Šćepanović, Maja, Mijin, Dušan Ž., Matkovic, A., Grujić-Brojčin, Mirjana, Babić, Biljana M., "Synthesis of Anatase Nanopowders by Sol-gel Method and Influence of Temperatures of Calcination to Their Photocatalitic Properties" in Science of Sintering, 47, no. 1 (2015):41-49,
https://doi.org/10.2298/SOS1501041G . .
1
3
3

Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route

Tomić, Nataša; Grujić-Brojčin, Mirjana; Finčur, Nina L.; Abramović, Biljana F.; Simović, Bojana; Krstić, Jugoslav B.; Matović, Branko; Šćepanović, Maja

(Elsevier, 2015)

TY  - JOUR
AU  - Tomić, Nataša
AU  - Grujić-Brojčin, Mirjana
AU  - Finčur, Nina L.
AU  - Abramović, Biljana F.
AU  - Simović, Bojana
AU  - Krstić, Jugoslav B.
AU  - Matović, Branko
AU  - Šćepanović, Maja
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/821
AB  - Two series of nanocrystalline brookite-type powders have been synthesized by using combined sal gel hydrothermal method with titanium tetrachloride (TiCI4) as a precursor and hydrothermal temperature and reaction time varied in the range of 120-200 degrees C and 12-48 h, respectively. The effects of chosen synthesis parameters on structural, morphological and optical properties of synthesized powders have been investigated by the XRPD, SEM, EDS and BET measurements, as well Raman spectroscopy and spectroscopic ellipsometry. The XRPD results have shown that pure brookite phase, with mean crystallite size of -33 nm, has been obtained only in the sample synthesized at 200 degrees C, after 24 h of hydrothermal process. In all other samples anatase phase also appears, whereas rutile and sodium titanate phases have been noticed in the samples synthesized at lower temperatures. The presence of different titania phases has also been confirmed and analyzed by Raman scattering measurements. The SEM measurements have shown spindle-like particles in brookite-rich samples synthesized at 200 degrees C, whereas BET measurements have detected mesoporous structure in these samples. The properties of synthesized powders have been correlated to their photocatalytic efficiency, tested in degradation of alprazolam, one of the 5th generation benzodiazepines. The sample consisted of pure brookite has shown the highest efficiency in the photodegradation of alprazolam, practically equal to the activity of Degussa P25. (C) 2015 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Materials Chemistry and Physics
T1  - Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route
VL  - 163
SP  - 518
EP  - 528
DO  - 10.1016/j.matchemphys.2015.08.008
ER  - 
@article{
author = "Tomić, Nataša and Grujić-Brojčin, Mirjana and Finčur, Nina L. and Abramović, Biljana F. and Simović, Bojana and Krstić, Jugoslav B. and Matović, Branko and Šćepanović, Maja",
year = "2015",
abstract = "Two series of nanocrystalline brookite-type powders have been synthesized by using combined sal gel hydrothermal method with titanium tetrachloride (TiCI4) as a precursor and hydrothermal temperature and reaction time varied in the range of 120-200 degrees C and 12-48 h, respectively. The effects of chosen synthesis parameters on structural, morphological and optical properties of synthesized powders have been investigated by the XRPD, SEM, EDS and BET measurements, as well Raman spectroscopy and spectroscopic ellipsometry. The XRPD results have shown that pure brookite phase, with mean crystallite size of -33 nm, has been obtained only in the sample synthesized at 200 degrees C, after 24 h of hydrothermal process. In all other samples anatase phase also appears, whereas rutile and sodium titanate phases have been noticed in the samples synthesized at lower temperatures. The presence of different titania phases has also been confirmed and analyzed by Raman scattering measurements. The SEM measurements have shown spindle-like particles in brookite-rich samples synthesized at 200 degrees C, whereas BET measurements have detected mesoporous structure in these samples. The properties of synthesized powders have been correlated to their photocatalytic efficiency, tested in degradation of alprazolam, one of the 5th generation benzodiazepines. The sample consisted of pure brookite has shown the highest efficiency in the photodegradation of alprazolam, practically equal to the activity of Degussa P25. (C) 2015 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Chemistry and Physics",
title = "Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route",
volume = "163",
pages = "518-528",
doi = "10.1016/j.matchemphys.2015.08.008"
}
Tomić, N., Grujić-Brojčin, M., Finčur, N. L., Abramović, B. F., Simović, B., Krstić, J. B., Matović, B.,& Šćepanović, M.. (2015). Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route. in Materials Chemistry and Physics
Elsevier., 163, 518-528.
https://doi.org/10.1016/j.matchemphys.2015.08.008
Tomić N, Grujić-Brojčin M, Finčur NL, Abramović BF, Simović B, Krstić JB, Matović B, Šćepanović M. Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route. in Materials Chemistry and Physics. 2015;163:518-528.
doi:10.1016/j.matchemphys.2015.08.008 .
Tomić, Nataša, Grujić-Brojčin, Mirjana, Finčur, Nina L., Abramović, Biljana F., Simović, Bojana, Krstić, Jugoslav B., Matović, Branko, Šćepanović, Maja, "Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route" in Materials Chemistry and Physics, 163 (2015):518-528,
https://doi.org/10.1016/j.matchemphys.2015.08.008 . .
27
29
30

Spectroscopy investigation of nanostructured nickel-zinc ferrite obtained by mechanochemical synthesis

Lazarević, Zorica Ž.; Milutinovic, Aleksandra N.; Jovalekic, Cedomir D.; Ivanovski, Valentin N.; Daneu, Nina; Mađarević, Ivan; Romčević, Nebojša Ž.

(2015)

TY  - JOUR
AU  - Lazarević, Zorica Ž.
AU  - Milutinovic, Aleksandra N.
AU  - Jovalekic, Cedomir D.
AU  - Ivanovski, Valentin N.
AU  - Daneu, Nina
AU  - Mađarević, Ivan
AU  - Romčević, Nebojša Ž.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/386
AB  - Nano crystalline samples of nickel zinc ferrite, Ni0.5Zn0.5Fe2O4 were prepared by mechanochemical route in a planetary ball mill starting from two mixtures of the appropriate quantities of the powders: case (1) oxide powders: NiO, ZnO and alpha-Fe2O3 in one case, and in the second case (2) hydroxide powders: Ni(OH)(2), Zn(OH)(2) and Fe(OH)(3). In order to monitor the progress of chemical reaction and confirm phase formation, powder samples obtained after 5 h and 10 h of milling were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman, IR and Mossbauer spectroscopy. It is shown that the soft mechanochemical method, i.e. mechanochemical activation of hydroxides, produces high quality single phase Ni0.5Zn0.5Fe2O4 samples in much more efficient way. From the IR spectroscopy of single phase samples it is obvious that energy of modes depends on the ratio of cations. The deconvolution of Raman spectra allows to separate contributions of different cations to a particular type of vibration and to estimate the degree of inversion. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Materials Research Bulletin
T1  - Spectroscopy investigation of nanostructured nickel-zinc ferrite obtained by mechanochemical synthesis
VL  - 63
SP  - 239
EP  - 247
DO  - 10.1016/j.materresbull.2014.12.005
ER  - 
@article{
author = "Lazarević, Zorica Ž. and Milutinovic, Aleksandra N. and Jovalekic, Cedomir D. and Ivanovski, Valentin N. and Daneu, Nina and Mađarević, Ivan and Romčević, Nebojša Ž.",
year = "2015",
abstract = "Nano crystalline samples of nickel zinc ferrite, Ni0.5Zn0.5Fe2O4 were prepared by mechanochemical route in a planetary ball mill starting from two mixtures of the appropriate quantities of the powders: case (1) oxide powders: NiO, ZnO and alpha-Fe2O3 in one case, and in the second case (2) hydroxide powders: Ni(OH)(2), Zn(OH)(2) and Fe(OH)(3). In order to monitor the progress of chemical reaction and confirm phase formation, powder samples obtained after 5 h and 10 h of milling were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman, IR and Mossbauer spectroscopy. It is shown that the soft mechanochemical method, i.e. mechanochemical activation of hydroxides, produces high quality single phase Ni0.5Zn0.5Fe2O4 samples in much more efficient way. From the IR spectroscopy of single phase samples it is obvious that energy of modes depends on the ratio of cations. The deconvolution of Raman spectra allows to separate contributions of different cations to a particular type of vibration and to estimate the degree of inversion. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Materials Research Bulletin",
title = "Spectroscopy investigation of nanostructured nickel-zinc ferrite obtained by mechanochemical synthesis",
volume = "63",
pages = "239-247",
doi = "10.1016/j.materresbull.2014.12.005"
}
Lazarević, Z. Ž., Milutinovic, A. N., Jovalekic, C. D., Ivanovski, V. N., Daneu, N., Mađarević, I.,& Romčević, N. Ž.. (2015). Spectroscopy investigation of nanostructured nickel-zinc ferrite obtained by mechanochemical synthesis. in Materials Research Bulletin, 63, 239-247.
https://doi.org/10.1016/j.materresbull.2014.12.005
Lazarević ZŽ, Milutinovic AN, Jovalekic CD, Ivanovski VN, Daneu N, Mađarević I, Romčević NŽ. Spectroscopy investigation of nanostructured nickel-zinc ferrite obtained by mechanochemical synthesis. in Materials Research Bulletin. 2015;63:239-247.
doi:10.1016/j.materresbull.2014.12.005 .
Lazarević, Zorica Ž., Milutinovic, Aleksandra N., Jovalekic, Cedomir D., Ivanovski, Valentin N., Daneu, Nina, Mađarević, Ivan, Romčević, Nebojša Ž., "Spectroscopy investigation of nanostructured nickel-zinc ferrite obtained by mechanochemical synthesis" in Materials Research Bulletin, 63 (2015):239-247,
https://doi.org/10.1016/j.materresbull.2014.12.005 . .
13
11
11

Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals

Radović, Marko B.; Dohcevic-Mitrovic, Z.; Paunović, Novica M.; Bošković, Snežana B.; Tomić, Nataša; Tadić, Nenad; Belca, I.

(2015)

TY  - JOUR
AU  - Radović, Marko B.
AU  - Dohcevic-Mitrovic, Z.
AU  - Paunović, Novica M.
AU  - Bošković, Snežana B.
AU  - Tomić, Nataša
AU  - Tadić, Nenad
AU  - Belca, I.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/379
AB  - Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effective medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place.
T2  - Journal of Physics. D: Applied Physics
T1  - Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals
VL  - 48
IS  - 6
DO  - 10.1088/0022-3727/48/6/065301
ER  - 
@article{
author = "Radović, Marko B. and Dohcevic-Mitrovic, Z. and Paunović, Novica M. and Bošković, Snežana B. and Tomić, Nataša and Tadić, Nenad and Belca, I.",
year = "2015",
abstract = "Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effective medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place.",
journal = "Journal of Physics. D: Applied Physics",
title = "Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals",
volume = "48",
number = "6",
doi = "10.1088/0022-3727/48/6/065301"
}
Radović, M. B., Dohcevic-Mitrovic, Z., Paunović, N. M., Bošković, S. B., Tomić, N., Tadić, N.,& Belca, I.. (2015). Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals. in Journal of Physics. D: Applied Physics, 48(6).
https://doi.org/10.1088/0022-3727/48/6/065301
Radović MB, Dohcevic-Mitrovic Z, Paunović NM, Bošković SB, Tomić N, Tadić N, Belca I. Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals. in Journal of Physics. D: Applied Physics. 2015;48(6).
doi:10.1088/0022-3727/48/6/065301 .
Radović, Marko B., Dohcevic-Mitrovic, Z., Paunović, Novica M., Bošković, Snežana B., Tomić, Nataša, Tadić, Nenad, Belca, I., "Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals" in Journal of Physics. D: Applied Physics, 48, no. 6 (2015),
https://doi.org/10.1088/0022-3727/48/6/065301 . .
4
4
4

Enhancing photocatalytic properties of rutile TiO2 by codoping with N and metals - Ab initio study

Belošević-Čavor, Jelena; Batalović, Katarina; Koteski, Vasil J.; Radaković, Jana; Rangel, C. M.

(2015)

TY  - JOUR
AU  - Belošević-Čavor, Jelena
AU  - Batalović, Katarina
AU  - Koteski, Vasil J.
AU  - Radaković, Jana
AU  - Rangel, C. M.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/676
AB  - Substitutional N to O and M to Ti (M = Pt, V, Sb) codoped rutile TiO2 was investigated using density functional theory (OFT) based calculations with both standard and hybrid exchange-correlation functionals. The band gaps calculated using generalized gradient approximation (GGA) exhibited narrowing compared to the pure rutile TiO2 in all the investigated cases. In contrast, the results obtained with hybrid exchange-correlation functional showed that there was no band gap narrowing, but doping induced localized states within the band gap just above the valence band, as well as below the conduction band for Pt doped TiO2. The presence of broad intermediate states (IS) in the band gap could enhance visible light absorption through a two step optical transition from the valence to the conduction band via the IS and at the same time lower recombination of the photo-generated charges. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
T2  - International Journal of Hydrogen Energy
T1  - Enhancing photocatalytic properties of rutile TiO2 by codoping with N and metals - Ab initio study
VL  - 40
IS  - 31
SP  - 9696
EP  - 9703
DO  - 10.1016/j.ijhydene.2015.06.001
ER  - 
@article{
author = "Belošević-Čavor, Jelena and Batalović, Katarina and Koteski, Vasil J. and Radaković, Jana and Rangel, C. M.",
year = "2015",
abstract = "Substitutional N to O and M to Ti (M = Pt, V, Sb) codoped rutile TiO2 was investigated using density functional theory (OFT) based calculations with both standard and hybrid exchange-correlation functionals. The band gaps calculated using generalized gradient approximation (GGA) exhibited narrowing compared to the pure rutile TiO2 in all the investigated cases. In contrast, the results obtained with hybrid exchange-correlation functional showed that there was no band gap narrowing, but doping induced localized states within the band gap just above the valence band, as well as below the conduction band for Pt doped TiO2. The presence of broad intermediate states (IS) in the band gap could enhance visible light absorption through a two step optical transition from the valence to the conduction band via the IS and at the same time lower recombination of the photo-generated charges. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.",
journal = "International Journal of Hydrogen Energy",
title = "Enhancing photocatalytic properties of rutile TiO2 by codoping with N and metals - Ab initio study",
volume = "40",
number = "31",
pages = "9696-9703",
doi = "10.1016/j.ijhydene.2015.06.001"
}
Belošević-Čavor, J., Batalović, K., Koteski, V. J., Radaković, J.,& Rangel, C. M.. (2015). Enhancing photocatalytic properties of rutile TiO2 by codoping with N and metals - Ab initio study. in International Journal of Hydrogen Energy, 40(31), 9696-9703.
https://doi.org/10.1016/j.ijhydene.2015.06.001
Belošević-Čavor J, Batalović K, Koteski VJ, Radaković J, Rangel CM. Enhancing photocatalytic properties of rutile TiO2 by codoping with N and metals - Ab initio study. in International Journal of Hydrogen Energy. 2015;40(31):9696-9703.
doi:10.1016/j.ijhydene.2015.06.001 .
Belošević-Čavor, Jelena, Batalović, Katarina, Koteski, Vasil J., Radaković, Jana, Rangel, C. M., "Enhancing photocatalytic properties of rutile TiO2 by codoping with N and metals - Ab initio study" in International Journal of Hydrogen Energy, 40, no. 31 (2015):9696-9703,
https://doi.org/10.1016/j.ijhydene.2015.06.001 . .
15
14
15

Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles

Dohcevic-Mitrovic, Z. D.; Paunović, Novica M.; Matović, Branko; Osiceanu, P.; Scurtu, R.; Askrabic, S.; Radović, Marko B.

(2015)

TY  - JOUR
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Paunović, Novica M.
AU  - Matović, Branko
AU  - Osiceanu, P.
AU  - Scurtu, R.
AU  - Askrabic, S.
AU  - Radović, Marko B.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/505
AB  - Y-doped HfO2 nanopowders, produced by metathesis synthesis, exhibit ferromagnetism at room temperature. The X-ray diffraction and Raman measurements have shown that HfO2 nanopowders undergo phase transformation from monoclinic to tetragonal and cubic phase with increasing of Y content. The X-ray photoelectron spectroscopy and Raman analysis gave evidence that Y-doped HfO2 nanopowders are oxygen deficient. The ferromagnetic properties of Y-doped HfO2 nanocrystals are dependent on crystal structure changes. The structural transformation from monoclinic to tetragonal phase with Y doping is followed by increased ferromagnetic ordering because of the increased concentration of oxygen vacancies (V-O) in different charge states. Higher Y content favors the formation of cubic phase and the ferromagnetism significantly weakens. In cubic hafnia phase, yttrium can form (V-O-Y-Hf) defect complexes in different charge states. The appearance of these complexes can be responsible for the degradation of ferromagnetic ordering. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles
VL  - 41
IS  - 5
SP  - 6970
EP  - 6977
DO  - 10.1016/j.ceramint.2015.02.002
ER  - 
@article{
author = "Dohcevic-Mitrovic, Z. D. and Paunović, Novica M. and Matović, Branko and Osiceanu, P. and Scurtu, R. and Askrabic, S. and Radović, Marko B.",
year = "2015",
abstract = "Y-doped HfO2 nanopowders, produced by metathesis synthesis, exhibit ferromagnetism at room temperature. The X-ray diffraction and Raman measurements have shown that HfO2 nanopowders undergo phase transformation from monoclinic to tetragonal and cubic phase with increasing of Y content. The X-ray photoelectron spectroscopy and Raman analysis gave evidence that Y-doped HfO2 nanopowders are oxygen deficient. The ferromagnetic properties of Y-doped HfO2 nanocrystals are dependent on crystal structure changes. The structural transformation from monoclinic to tetragonal phase with Y doping is followed by increased ferromagnetic ordering because of the increased concentration of oxygen vacancies (V-O) in different charge states. Higher Y content favors the formation of cubic phase and the ferromagnetism significantly weakens. In cubic hafnia phase, yttrium can form (V-O-Y-Hf) defect complexes in different charge states. The appearance of these complexes can be responsible for the degradation of ferromagnetic ordering. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles",
volume = "41",
number = "5",
pages = "6970-6977",
doi = "10.1016/j.ceramint.2015.02.002"
}
Dohcevic-Mitrovic, Z. D., Paunović, N. M., Matović, B., Osiceanu, P., Scurtu, R., Askrabic, S.,& Radović, M. B.. (2015). Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles. in Ceramics International, 41(5), 6970-6977.
https://doi.org/10.1016/j.ceramint.2015.02.002
Dohcevic-Mitrovic ZD, Paunović NM, Matović B, Osiceanu P, Scurtu R, Askrabic S, Radović MB. Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles. in Ceramics International. 2015;41(5):6970-6977.
doi:10.1016/j.ceramint.2015.02.002 .
Dohcevic-Mitrovic, Z. D., Paunović, Novica M., Matović, Branko, Osiceanu, P., Scurtu, R., Askrabic, S., Radović, Marko B., "Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles" in Ceramics International, 41, no. 5 (2015):6970-6977,
https://doi.org/10.1016/j.ceramint.2015.02.002 . .
15
13
14

Influence of Ta and Nb on the hydrogen absorption kinetics in Zr-based alloys

Conic, D.; Gradisek, A.; Radaković, Jana; Iordoc, M.; Mirković, Miljana M.; Čebela, Maria; Batalović, Katarina

(2015)

TY  - JOUR
AU  - Conic, D.
AU  - Gradisek, A.
AU  - Radaković, Jana
AU  - Iordoc, M.
AU  - Mirković, Miljana M.
AU  - Čebela, Maria
AU  - Batalović, Katarina
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/269
AB  - The kinetics of hydrogen absorption in Zr alloys containing Nb and Ta admixtures (10 wt% Nb, 12 wt%Ta and 10 wt%Nb and 12 wt%Ta) is addressed. Hydrogen absorption is measured in the temperature range 400-700 degrees C at hydrogen pressure 1 bar using the volumetric method, and a kinetic analysis is performed to determine the mechanisms and rates of hydrogen absorption. To get further insight into hydrogen diffusivity in zirconium hydride, H-1 NMR spectroscopy is used to provide the activation energies for proton jumping in the studied samples. The tantalum is found to dominantly influence the surface reactivity, while niobium influences large decrease of the activation energy for hydrogen diffusion in the bulk of zirconium hydride. This behavior is linked to the information on the structure of the alloys obtained by XRD. Copyright.(C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
T2  - International Journal of Hydrogen Energy
T1  - Influence of Ta and Nb on the hydrogen absorption kinetics in Zr-based alloys
VL  - 40
IS  - 16
SP  - 5677
EP  - 5682
DO  - 10.1016/j.ijhydene.2015.02.083
ER  - 
@article{
author = "Conic, D. and Gradisek, A. and Radaković, Jana and Iordoc, M. and Mirković, Miljana M. and Čebela, Maria and Batalović, Katarina",
year = "2015",
abstract = "The kinetics of hydrogen absorption in Zr alloys containing Nb and Ta admixtures (10 wt% Nb, 12 wt%Ta and 10 wt%Nb and 12 wt%Ta) is addressed. Hydrogen absorption is measured in the temperature range 400-700 degrees C at hydrogen pressure 1 bar using the volumetric method, and a kinetic analysis is performed to determine the mechanisms and rates of hydrogen absorption. To get further insight into hydrogen diffusivity in zirconium hydride, H-1 NMR spectroscopy is used to provide the activation energies for proton jumping in the studied samples. The tantalum is found to dominantly influence the surface reactivity, while niobium influences large decrease of the activation energy for hydrogen diffusion in the bulk of zirconium hydride. This behavior is linked to the information on the structure of the alloys obtained by XRD. Copyright.(C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.",
journal = "International Journal of Hydrogen Energy",
title = "Influence of Ta and Nb on the hydrogen absorption kinetics in Zr-based alloys",
volume = "40",
number = "16",
pages = "5677-5682",
doi = "10.1016/j.ijhydene.2015.02.083"
}
Conic, D., Gradisek, A., Radaković, J., Iordoc, M., Mirković, M. M., Čebela, M.,& Batalović, K.. (2015). Influence of Ta and Nb on the hydrogen absorption kinetics in Zr-based alloys. in International Journal of Hydrogen Energy, 40(16), 5677-5682.
https://doi.org/10.1016/j.ijhydene.2015.02.083
Conic D, Gradisek A, Radaković J, Iordoc M, Mirković MM, Čebela M, Batalović K. Influence of Ta and Nb on the hydrogen absorption kinetics in Zr-based alloys. in International Journal of Hydrogen Energy. 2015;40(16):5677-5682.
doi:10.1016/j.ijhydene.2015.02.083 .
Conic, D., Gradisek, A., Radaković, Jana, Iordoc, M., Mirković, Miljana M., Čebela, Maria, Batalović, Katarina, "Influence of Ta and Nb on the hydrogen absorption kinetics in Zr-based alloys" in International Journal of Hydrogen Energy, 40, no. 16 (2015):5677-5682,
https://doi.org/10.1016/j.ijhydene.2015.02.083 . .
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