TY  - JOUR
AU  - Šuljagić, Marija
AU  - Petronijević, Ivan
AU  - Mirković, Miljana M.
AU  - Kremenović, Aleksandar S.
AU  - Džunuzović, Adis
AU  - Pavlović, Vladimir B.
AU  - Kalezić-Glišović, Aleksandra
AU  - Anđelković, Ljubica
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10690
AB  - To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ferroelectric properties were investigated. The optimal phase composition in the BaTiO3/NiFe2O4 composite, sintered at 1150 °C, resulted in a wide frequency range stability. Additionally, particular phase composition indicates favorable properties such as low conductivity and ideal-like hysteresis loop behavior. The favorable properties of BaTiO3/NiFe2O4 make this particular composite an ideal material choice for further studies on applications of multi-ferroic devices.
T2  - Inorganics
T1  - BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties
VL  - 11
IS  - 2
SP  - 51
DO  - 10.3390/inorganics11020051
ER  - 

@article{
author = "Šuljagić, Marija and Petronijević, Ivan and Mirković, Miljana M. and Kremenović, Aleksandar S. and Džunuzović, Adis and Pavlović, Vladimir B. and Kalezić-Glišović, Aleksandra and Anđelković, Ljubica",
year = "2023",
abstract = "To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ferroelectric properties were investigated. The optimal phase composition in the BaTiO3/NiFe2O4 composite, sintered at 1150 °C, resulted in a wide frequency range stability. Additionally, particular phase composition indicates favorable properties such as low conductivity and ideal-like hysteresis loop behavior. The favorable properties of BaTiO3/NiFe2O4 make this particular composite an ideal material choice for further studies on applications of multi-ferroic devices.",
journal = "Inorganics",
title = "BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties",
volume = "11",
number = "2",
pages = "51",
doi = "10.3390/inorganics11020051"
}

Šuljagić, M., Petronijević, I., Mirković, M. M., Kremenović, A. S., Džunuzović, A., Pavlović, V. B., Kalezić-Glišović, A.,& Anđelković, L.. (2023). BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties. in Inorganics, 11(2), 51.
https://doi.org/10.3390/inorganics11020051

Šuljagić M, Petronijević I, Mirković MM, Kremenović AS, Džunuzović A, Pavlović VB, Kalezić-Glišović A, Anđelković L. BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties. in Inorganics. 2023;11(2):51.
doi:10.3390/inorganics11020051 .

Šuljagić, Marija, Petronijević, Ivan, Mirković, Miljana M., Kremenović, Aleksandar S., Džunuzović, Adis, Pavlović, Vladimir B., Kalezić-Glišović, Aleksandra, Anđelković, Ljubica, "BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties" in Inorganics, 11, no. 2 (2023):51,
https://doi.org/10.3390/inorganics11020051 . .

TY  - JOUR
AU  - Mitrović, Jelena
AU  - Bjelošević Žiberna, Maja
AU  - Vukadinović, Aleksandar
AU  - Knutson, Daniel E.
AU  - Sharmin, Dishary
AU  - Kremenović, Aleksandar
AU  - Ahlin Grabnar, Pegi
AU  - Planinšek, Odon
AU  - Lunter, Dominique
AU  - Cook, James M
AU  - Savić, Miroslav
AU  - Savić, Snežana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11440
AB  - Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms of particle size, solid state properties and morphology, while the interactions within the samples were analyzed by Fourier transform infrared spectroscopy. In the preliminary study, three formulations were selected based on the high redispersibility index values (around 95%). The temperature of primary drying had no significant effect on particle size, but stability during storage was impaired for samples dried at -10 °C. Samples dried at lower temperature were more homogeneous and remained stable for three months. It was found that the optimal ratio of sucrose or trehalose to mannitol was 3:2 at a total concentration of 10% to achieve the best stability (particle size < 1.0 μm, polydispersity index < 0.250). The amorphous state of lyoprotectants probably provided a high degree of interaction with nanocrystals, while the crystalline mannitol provided an elegant cake structure. Sucrose was superior to trehalose in maintaining particle size during freeze-drying, while trehalose was more effective in keeping particle size within limits during storage. In conclusion, results demonstrated that the appropriate combination of sucrose/trehalose and mannitol together with the appropriate selection of lyophilization process parameters could yield nanocrystals with satisfactory stability.
T2  - European Journal of Pharmaceutical Sciences
T1  - Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study
VL  - 189
DO  - 10.1016/j.ejps.2023.106557
ER  - 

@article{
author = "Mitrović, Jelena and Bjelošević Žiberna, Maja and Vukadinović, Aleksandar and Knutson, Daniel E. and Sharmin, Dishary and Kremenović, Aleksandar and Ahlin Grabnar, Pegi and Planinšek, Odon and Lunter, Dominique and Cook, James M and Savić, Miroslav and Savić, Snežana",
year = "2023",
abstract = "Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms of particle size, solid state properties and morphology, while the interactions within the samples were analyzed by Fourier transform infrared spectroscopy. In the preliminary study, three formulations were selected based on the high redispersibility index values (around 95%). The temperature of primary drying had no significant effect on particle size, but stability during storage was impaired for samples dried at -10 °C. Samples dried at lower temperature were more homogeneous and remained stable for three months. It was found that the optimal ratio of sucrose or trehalose to mannitol was 3:2 at a total concentration of 10% to achieve the best stability (particle size < 1.0 μm, polydispersity index < 0.250). The amorphous state of lyoprotectants probably provided a high degree of interaction with nanocrystals, while the crystalline mannitol provided an elegant cake structure. Sucrose was superior to trehalose in maintaining particle size during freeze-drying, while trehalose was more effective in keeping particle size within limits during storage. In conclusion, results demonstrated that the appropriate combination of sucrose/trehalose and mannitol together with the appropriate selection of lyophilization process parameters could yield nanocrystals with satisfactory stability.",
journal = "European Journal of Pharmaceutical Sciences",
title = "Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study",
volume = "189",
doi = "10.1016/j.ejps.2023.106557"
}

Mitrović, J., Bjelošević Žiberna, M., Vukadinović, A., Knutson, D. E., Sharmin, D., Kremenović, A., Ahlin Grabnar, P., Planinšek, O., Lunter, D., Cook, J. M., Savić, M.,& Savić, S.. (2023). Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study. in European Journal of Pharmaceutical Sciences, 189.
https://doi.org/10.1016/j.ejps.2023.106557

Mitrović J, Bjelošević Žiberna M, Vukadinović A, Knutson DE, Sharmin D, Kremenović A, Ahlin Grabnar P, Planinšek O, Lunter D, Cook JM, Savić M, Savić S. Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study. in European Journal of Pharmaceutical Sciences. 2023;189.
doi:10.1016/j.ejps.2023.106557 .

Mitrović, Jelena, Bjelošević Žiberna, Maja, Vukadinović, Aleksandar, Knutson, Daniel E., Sharmin, Dishary, Kremenović, Aleksandar, Ahlin Grabnar, Pegi, Planinšek, Odon, Lunter, Dominique, Cook, James M, Savić, Miroslav, Savić, Snežana, "Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study" in European Journal of Pharmaceutical Sciences, 189 (2023),
https://doi.org/10.1016/j.ejps.2023.106557 . .

TY  - JOUR
AU  - Dojčinović, Biljana P.
AU  - Jančar, Boštjan
AU  - Bessais, Lotfi
AU  - Kremenović, Aleksandar S.
AU  - Jović-Jovičić, Nataša P.
AU  - Banković, Predrag T.
AU  - Stanković, Dalibor M.
AU  - Ognjanović, Miloš
AU  - Antić, Bratislav
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8612
AB  - Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3-xYxO4 nanoparticles formed. The series of Fe3-xYxO4 (x = 0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200 degrees C. With increase of yttrium content (x value), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By both transmission electron microscopy and x-ray powder diffraction analyses, it was determined that the direction of growth of the spinel nanorods is along the [110] crystallographic direction. The Fe3-xYxO4 affinities of adsorption toward the inorganic arsenic species, As(III) (arsenite, AsO33-) and As(V) (arsenate, AsO43-), were investigated. Increased Y3+ content related to changes in sample morphology was followed by a decrease of As(III) removal efficiency and vice versa for As(V). The increase in Y3+ content, in addition to increasing the adsorption capacity for As(V), significantly expanded the optimum pH range for the maximum removal and decreased the contact time for necessary 50% removal (t(1/2)) of As(V) (Y00: pH 2-3, t(1/2) = 3.12 min; Y05: pH 2-6, t(1/2) = 2.12 min and Y10: pH 2-10, t(1/2) = 1.12 min). The results point to incorporation of Y3+ in the crystal lattice of magnetite, inducing nanorod spinel structure formation with significant changes in sorption properties important for the removal of inorganic arsenic from waters.
T2  - Nanotechnology
T1  - Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species
VL  - 30
IS  - 47
SP  - 475702
DO  - 10.1088/1361-6528/ab3ca2
ER  - 

@article{
author = "Dojčinović, Biljana P. and Jančar, Boštjan and Bessais, Lotfi and Kremenović, Aleksandar S. and Jović-Jovičić, Nataša P. and Banković, Predrag T. and Stanković, Dalibor M. and Ognjanović, Miloš and Antić, Bratislav",
year = "2019",
abstract = "Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3-xYxO4 nanoparticles formed. The series of Fe3-xYxO4 (x = 0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200 degrees C. With increase of yttrium content (x value), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By both transmission electron microscopy and x-ray powder diffraction analyses, it was determined that the direction of growth of the spinel nanorods is along the [110] crystallographic direction. The Fe3-xYxO4 affinities of adsorption toward the inorganic arsenic species, As(III) (arsenite, AsO33-) and As(V) (arsenate, AsO43-), were investigated. Increased Y3+ content related to changes in sample morphology was followed by a decrease of As(III) removal efficiency and vice versa for As(V). The increase in Y3+ content, in addition to increasing the adsorption capacity for As(V), significantly expanded the optimum pH range for the maximum removal and decreased the contact time for necessary 50% removal (t(1/2)) of As(V) (Y00: pH 2-3, t(1/2) = 3.12 min; Y05: pH 2-6, t(1/2) = 2.12 min and Y10: pH 2-10, t(1/2) = 1.12 min). The results point to incorporation of Y3+ in the crystal lattice of magnetite, inducing nanorod spinel structure formation with significant changes in sorption properties important for the removal of inorganic arsenic from waters.",
journal = "Nanotechnology",
title = "Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species",
volume = "30",
number = "47",
pages = "475702",
doi = "10.1088/1361-6528/ab3ca2"
}

Dojčinović, B. P., Jančar, B., Bessais, L., Kremenović, A. S., Jović-Jovičić, N. P., Banković, P. T., Stanković, D. M., Ognjanović, M.,& Antić, B.. (2019). Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species. in Nanotechnology, 30(47), 475702.
https://doi.org/10.1088/1361-6528/ab3ca2

Dojčinović BP, Jančar B, Bessais L, Kremenović AS, Jović-Jovičić NP, Banković PT, Stanković DM, Ognjanović M, Antić B. Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species. in Nanotechnology. 2019;30(47):475702.
doi:10.1088/1361-6528/ab3ca2 .

Dojčinović, Biljana P., Jančar, Boštjan, Bessais, Lotfi, Kremenović, Aleksandar S., Jović-Jovičić, Nataša P., Banković, Predrag T., Stanković, Dalibor M., Ognjanović, Miloš, Antić, Bratislav, "Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species" in Nanotechnology, 30, no. 47 (2019):475702,
https://doi.org/10.1088/1361-6528/ab3ca2 . .

TY  - JOUR
AU  - Kremenović, Aleksandar S.
AU  - Antić, Bratislav
AU  - Vulić, Predrag J.
AU  - Blanuša, Jovan
AU  - Tomić, Aleksandra
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1469
AB  - Magnetic structure of ZnFe2O4 normal spinel is re- examined. Antiferromagnetic structure non-collinear model is established within C(a)2 space group having four different crystallographic/magnetic sites for 32 Fe3+ spins within magnetic unit cell.
T2  - Journal of Magnetism and Magnetic Materials
T1  - ZnFe2O4 antiferromagnetic structure redetermination
VL  - 426
SP  - 264
EP  - 266
DO  - 10.1016/j.jmmm.2016.11.071
ER  - 

@article{
author = "Kremenović, Aleksandar S. and Antić, Bratislav and Vulić, Predrag J. and Blanuša, Jovan and Tomić, Aleksandra",
year = "2017",
abstract = "Magnetic structure of ZnFe2O4 normal spinel is re- examined. Antiferromagnetic structure non-collinear model is established within C(a)2 space group having four different crystallographic/magnetic sites for 32 Fe3+ spins within magnetic unit cell.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "ZnFe2O4 antiferromagnetic structure redetermination",
volume = "426",
pages = "264-266",
doi = "10.1016/j.jmmm.2016.11.071"
}

Kremenović, A. S., Antić, B., Vulić, P. J., Blanuša, J.,& Tomić, A.. (2017). ZnFe2O4 antiferromagnetic structure redetermination. in Journal of Magnetism and Magnetic Materials, 426, 264-266.
https://doi.org/10.1016/j.jmmm.2016.11.071

Kremenović AS, Antić B, Vulić PJ, Blanuša J, Tomić A. ZnFe2O4 antiferromagnetic structure redetermination. in Journal of Magnetism and Magnetic Materials. 2017;426:264-266.
doi:10.1016/j.jmmm.2016.11.071 .

Kremenović, Aleksandar S., Antić, Bratislav, Vulić, Predrag J., Blanuša, Jovan, Tomić, Aleksandra, "ZnFe2O4 antiferromagnetic structure redetermination" in Journal of Magnetism and Magnetic Materials, 426 (2017):264-266,
https://doi.org/10.1016/j.jmmm.2016.11.071 . .

TY  - JOUR
AU  - Welsch, A-M.
AU  - Murawski, D.
AU  - Prekajski, Marija D.
AU  - Vulic, P.
AU  - Kremenović, Aleksandar S.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/501
AB  - With the increased interest in application of Li aluminosilicate materials as solid electrolytes, this study focuses on investigating the influence of structure on conductivity properties in single-crystal LiAlSi2O6 which is characterized by three crystal polymorphs where only structural arrangements differ while the amount of mobile carriers is identical. Two single-crystal polymorphic phases produced at ambient pressure are with tetragonal P4(1)2(1)2 symmetry and hexagonal P6(2)22 symmetry, also referred to as beta- and gamma-spodumene in the older literature. For this study, flux-grown hexagonal spodumene single-crystals were measured for conductivity parallel to the crystallographic c-axis and the results were compared with previously published results for tetragonal spodumene, both as single-crystal and polycrystalline aggregate, monoclinic spodumene (alpha-spodumene) and LiAlSi2O6 glass. The activation energy E (a) of 79.69 +/- A 0.38 kJ/mol for hexagonal phase is very similar to the other crystalline polymorphs with the same orientation. However, the sigma (DC) in hexagonal spodumene was determined to be higher than other crystalline phases and about 1.5 orders of magnitude lower than the conductivity in glass LiAlSi2O6 phase. Additionally, the densities of atomic packing were compared between phases, and the differences in the openness of the structures indicate that the more dominant effect on the Li mobility lies with the actual spatial arrangement of Li sites and the Si/Al sublattice.
T2  - Physics and Chemistry of Minerals
T1  - Ionic conductivity in single-crystal LiAlSi2O6: influence of structure on lithium mobility
VL  - 42
IS  - 5
SP  - 413
EP  - 420
DO  - 10.1007/s00269-015-0732-2
ER  - 

@article{
author = "Welsch, A-M. and Murawski, D. and Prekajski, Marija D. and Vulic, P. and Kremenović, Aleksandar S.",
year = "2015",
abstract = "With the increased interest in application of Li aluminosilicate materials as solid electrolytes, this study focuses on investigating the influence of structure on conductivity properties in single-crystal LiAlSi2O6 which is characterized by three crystal polymorphs where only structural arrangements differ while the amount of mobile carriers is identical. Two single-crystal polymorphic phases produced at ambient pressure are with tetragonal P4(1)2(1)2 symmetry and hexagonal P6(2)22 symmetry, also referred to as beta- and gamma-spodumene in the older literature. For this study, flux-grown hexagonal spodumene single-crystals were measured for conductivity parallel to the crystallographic c-axis and the results were compared with previously published results for tetragonal spodumene, both as single-crystal and polycrystalline aggregate, monoclinic spodumene (alpha-spodumene) and LiAlSi2O6 glass. The activation energy E (a) of 79.69 +/- A 0.38 kJ/mol for hexagonal phase is very similar to the other crystalline polymorphs with the same orientation. However, the sigma (DC) in hexagonal spodumene was determined to be higher than other crystalline phases and about 1.5 orders of magnitude lower than the conductivity in glass LiAlSi2O6 phase. Additionally, the densities of atomic packing were compared between phases, and the differences in the openness of the structures indicate that the more dominant effect on the Li mobility lies with the actual spatial arrangement of Li sites and the Si/Al sublattice.",
journal = "Physics and Chemistry of Minerals",
title = "Ionic conductivity in single-crystal LiAlSi2O6: influence of structure on lithium mobility",
volume = "42",
number = "5",
pages = "413-420",
doi = "10.1007/s00269-015-0732-2"
}

Welsch, A-M., Murawski, D., Prekajski, M. D., Vulic, P.,& Kremenović, A. S.. (2015). Ionic conductivity in single-crystal LiAlSi2O6: influence of structure on lithium mobility. in Physics and Chemistry of Minerals, 42(5), 413-420.
https://doi.org/10.1007/s00269-015-0732-2

Welsch A, Murawski D, Prekajski MD, Vulic P, Kremenović AS. Ionic conductivity in single-crystal LiAlSi2O6: influence of structure on lithium mobility. in Physics and Chemistry of Minerals. 2015;42(5):413-420.
doi:10.1007/s00269-015-0732-2 .

Welsch, A-M., Murawski, D., Prekajski, Marija D., Vulic, P., Kremenović, Aleksandar S., "Ionic conductivity in single-crystal LiAlSi2O6: influence of structure on lithium mobility" in Physics and Chemistry of Minerals, 42, no. 5 (2015):413-420,
https://doi.org/10.1007/s00269-015-0732-2 . .

TY  - JOUR
AU  - Radosavljević-Mihajlović, Ana S.
AU  - Kremenović, Aleksandar S.
AU  - Došen, Anja M.
AU  - Andrejic, J. Z.
AU  - Dondur, Vera
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/218
AB  - Thermally induced phase transformations of Pb-exchange LTA and FAU zeolites were from ambient temperature to 1300 degrees C. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 degrees C. Prolonged heating of the intermediate product over 1100 degrees C results in the formation of disordered Pb-feldspar(LTA) [a = 8.414 (4) angstrom, b = 13.048 (4) angstrom, c = 7.169 (4) angstrom, beta = 115.35 degrees (3)] and Pb-feldspar(FAU) [a = 8.422 (4) angstrom, b = 13.054 (4) angstrom, c = 7.173 (4) angstrom, beta = 115.37 degrees (3)] phases. The phase conversions within the investigated temperature range were followed by thermal (DTA, TGA, and DSC), XRPD, and Raman methods. (C) 2014 Elsevier Inc. All rights reserved.
T2  - Microporous and Mesoporous Materials
T1  - Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases
VL  - 201
SP  - 210
EP  - 218
DO  - 10.1016/j.micromeso.2014.08.059
ER  - 

@article{
author = "Radosavljević-Mihajlović, Ana S. and Kremenović, Aleksandar S. and Došen, Anja M. and Andrejic, J. Z. and Dondur, Vera",
year = "2015",
abstract = "Thermally induced phase transformations of Pb-exchange LTA and FAU zeolites were from ambient temperature to 1300 degrees C. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 degrees C. Prolonged heating of the intermediate product over 1100 degrees C results in the formation of disordered Pb-feldspar(LTA) [a = 8.414 (4) angstrom, b = 13.048 (4) angstrom, c = 7.169 (4) angstrom, beta = 115.35 degrees (3)] and Pb-feldspar(FAU) [a = 8.422 (4) angstrom, b = 13.054 (4) angstrom, c = 7.173 (4) angstrom, beta = 115.37 degrees (3)] phases. The phase conversions within the investigated temperature range were followed by thermal (DTA, TGA, and DSC), XRPD, and Raman methods. (C) 2014 Elsevier Inc. All rights reserved.",
journal = "Microporous and Mesoporous Materials",
title = "Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases",
volume = "201",
pages = "210-218",
doi = "10.1016/j.micromeso.2014.08.059"
}

Radosavljević-Mihajlović, A. S., Kremenović, A. S., Došen, A. M., Andrejic, J. Z.,& Dondur, V.. (2015). Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases. in Microporous and Mesoporous Materials, 201, 210-218.
https://doi.org/10.1016/j.micromeso.2014.08.059

Radosavljević-Mihajlović AS, Kremenović AS, Došen AM, Andrejic JZ, Dondur V. Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases. in Microporous and Mesoporous Materials. 2015;201:210-218.
doi:10.1016/j.micromeso.2014.08.059 .

Radosavljević-Mihajlović, Ana S., Kremenović, Aleksandar S., Došen, Anja M., Andrejic, J. Z., Dondur, Vera, "Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases" in Microporous and Mesoporous Materials, 201 (2015):210-218,
https://doi.org/10.1016/j.micromeso.2014.08.059 . .

TY  - JOUR
AU  - Fabian, Martin
AU  - Antić, Bratislav
AU  - Girman, Vladimir
AU  - Vučinić-Vasić, Milica
AU  - Kremenović, Aleksandar S.
AU  - Suzuki, Shigeru
AU  - Hahn, Horst
AU  - Sepelak, Vladimir
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/718
AB  - A series of nanostructured fluorite-type Ce1-xYxO2-delta(0 LT = x LT = 0.35) solid solutions, prepared via high-energy milling of the CeO2/Y2O3 mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For the first time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1-xYxO2-delta, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria lattice as a consequence of yttrium incorporation. Raman spectra are directly affected by the presence of oxygen vacancies; their existence is evidenced by the presence of vibration modes at similar to 560 and similar to 600 cm(-1). The detailed spectroscopic investigations enable us to separate extrinsic and intrinsic origin of oxygen vacancies. It is demonstrated that mechanosynthesis can be successfully employed in the one-step preparation of nanocrystalline Ce1-xYxO2-delta solid solutions. (C) 2015 Elsevier Inc. All rights reserved.
T2  - Journal of Solid State Chemistry
T1  - Mechanosynthesis and structural characterization of nanocrystalline Ce1-xYxO2-delta(x=0.1-0.35) solid solutions
VL  - 230
SP  - 42
EP  - 48
DO  - 10.1016/j.jssc.2015.06.027
ER  - 

@article{
author = "Fabian, Martin and Antić, Bratislav and Girman, Vladimir and Vučinić-Vasić, Milica and Kremenović, Aleksandar S. and Suzuki, Shigeru and Hahn, Horst and Sepelak, Vladimir",
year = "2015",
abstract = "A series of nanostructured fluorite-type Ce1-xYxO2-delta(0 LT = x LT = 0.35) solid solutions, prepared via high-energy milling of the CeO2/Y2O3 mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For the first time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1-xYxO2-delta, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria lattice as a consequence of yttrium incorporation. Raman spectra are directly affected by the presence of oxygen vacancies; their existence is evidenced by the presence of vibration modes at similar to 560 and similar to 600 cm(-1). The detailed spectroscopic investigations enable us to separate extrinsic and intrinsic origin of oxygen vacancies. It is demonstrated that mechanosynthesis can be successfully employed in the one-step preparation of nanocrystalline Ce1-xYxO2-delta solid solutions. (C) 2015 Elsevier Inc. All rights reserved.",
journal = "Journal of Solid State Chemistry",
title = "Mechanosynthesis and structural characterization of nanocrystalline Ce1-xYxO2-delta(x=0.1-0.35) solid solutions",
volume = "230",
pages = "42-48",
doi = "10.1016/j.jssc.2015.06.027"
}

Fabian, M., Antić, B., Girman, V., Vučinić-Vasić, M., Kremenović, A. S., Suzuki, S., Hahn, H.,& Sepelak, V.. (2015). Mechanosynthesis and structural characterization of nanocrystalline Ce1-xYxO2-delta(x=0.1-0.35) solid solutions. in Journal of Solid State Chemistry, 230, 42-48.
https://doi.org/10.1016/j.jssc.2015.06.027

Fabian M, Antić B, Girman V, Vučinić-Vasić M, Kremenović AS, Suzuki S, Hahn H, Sepelak V. Mechanosynthesis and structural characterization of nanocrystalline Ce1-xYxO2-delta(x=0.1-0.35) solid solutions. in Journal of Solid State Chemistry. 2015;230:42-48.
doi:10.1016/j.jssc.2015.06.027 .

Fabian, Martin, Antić, Bratislav, Girman, Vladimir, Vučinić-Vasić, Milica, Kremenović, Aleksandar S., Suzuki, Shigeru, Hahn, Horst, Sepelak, Vladimir, "Mechanosynthesis and structural characterization of nanocrystalline Ce1-xYxO2-delta(x=0.1-0.35) solid solutions" in Journal of Solid State Chemistry, 230 (2015):42-48,
https://doi.org/10.1016/j.jssc.2015.06.027 . .

TY  - JOUR
AU  - Pantić, Jelena R.
AU  - Urbanovich, Vladimir
AU  - Poharc-Logar, Vesna
AU  - Jokić, Bojan M.
AU  - Stojmenović, Marija
AU  - Kremenović, Aleksandar S.
AU  - Matović, Branko
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/204
AB  - Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the high-pressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 A degrees C, sphene undergoes into phase transition, from room-temperature phase P2(1) /a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the structural information of the synthesized powder. The most important structural change due to phase transition, the disappearance of the characteristic out-of-center distortion of the Ti atom and moving to the center of octahedra, was confirmed. HPS is an effective method for producing full-dense ceramics without any additives. Reduction of particle size occurred during high-pressure compaction. Microstructure and particle size of both phases were analyzed by scanning electron microscopy.
T2  - Physics and Chemistry of Minerals
T1  - Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)
VL  - 41
IS  - 10
SP  - 775
EP  - 782
DO  - 10.1007/s00269-014-0693-x
ER  - 

@article{
author = "Pantić, Jelena R. and Urbanovich, Vladimir and Poharc-Logar, Vesna and Jokić, Bojan M. and Stojmenović, Marija and Kremenović, Aleksandar S. and Matović, Branko",
year = "2014",
abstract = "Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the high-pressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 A degrees C, sphene undergoes into phase transition, from room-temperature phase P2(1) /a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the structural information of the synthesized powder. The most important structural change due to phase transition, the disappearance of the characteristic out-of-center distortion of the Ti atom and moving to the center of octahedra, was confirmed. HPS is an effective method for producing full-dense ceramics without any additives. Reduction of particle size occurred during high-pressure compaction. Microstructure and particle size of both phases were analyzed by scanning electron microscopy.",
journal = "Physics and Chemistry of Minerals",
title = "Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)",
volume = "41",
number = "10",
pages = "775-782",
doi = "10.1007/s00269-014-0693-x"
}

Pantić, J. R., Urbanovich, V., Poharc-Logar, V., Jokić, B. M., Stojmenović, M., Kremenović, A. S.,& Matović, B.. (2014). Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5). in Physics and Chemistry of Minerals, 41(10), 775-782.
https://doi.org/10.1007/s00269-014-0693-x

Pantić JR, Urbanovich V, Poharc-Logar V, Jokić BM, Stojmenović M, Kremenović AS, Matović B. Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5). in Physics and Chemistry of Minerals. 2014;41(10):775-782.
doi:10.1007/s00269-014-0693-x .

Pantić, Jelena R., Urbanovich, Vladimir, Poharc-Logar, Vesna, Jokić, Bojan M., Stojmenović, Marija, Kremenović, Aleksandar S., Matović, Branko, "Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)" in Physics and Chemistry of Minerals, 41, no. 10 (2014):775-782,
https://doi.org/10.1007/s00269-014-0693-x . .

TY  - JOUR
AU  - Grujić-Brojčin, Mirjana
AU  - Armaković, Sanja J.
AU  - Tomić, Nataša
AU  - Abramović, Biljana F.
AU  - Golubavic, A.
AU  - Stojadinovic, B.
AU  - Kremenović, Aleksandar S.
AU  - Babić, Biljana M.
AU  - Dohcevic-Mitrovic, Z.
AU  - Šćepanović, Maja
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5881
AB  - The influence of La-doping in the range of 0.5-6.0 mol% on structural and morphological properties of TiO2 nanopowders synthesized by sol-gel routine has been investigated by XRPD, AFM, EDS and BET measurements, as well as Raman spectroscopy. The XRPD and Raman measurements have revealed the anatase phase as dominant in all nanopowders, with crystallite size decreasing from similar to 15 nm in pure TiO2 to similar to 12 nm in La-doped samples. The BET data suggest that all samples are fully mesoporous, with mean pore diameters in the range of similar to 6-8 nm. The specific surface area and the complexity of pore structure are greater in doped samples than in pure TiO2 sample. The spectroscopic ellipsometry has apparently shown that the band gap has been gradually increased with the increase of La content. The STM and STS techniques have been used successfully to evaluate the surface morphology and electronic properties of La-doped nanopowders. All investigated properties have been related to photocatalytic activity, tested in degradation of a metoprolol tartrate salt (0.05 mM), and induced by UV-radiation. All doped samples showed increased photocatalytic activity compared to pure TiO2, among which the 0.65 mol% La-doped sample appeared to be the most efficient. (C) 2013 Elsevier Inc. All rights reserved.
T2  - Materials Characterization
T1  - Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping
VL  - 88
SP  - 30
EP  - 41
DO  - 10.1016/j.matchar.2013.12.002
ER  - 

@article{
author = "Grujić-Brojčin, Mirjana and Armaković, Sanja J. and Tomić, Nataša and Abramović, Biljana F. and Golubavic, A. and Stojadinovic, B. and Kremenović, Aleksandar S. and Babić, Biljana M. and Dohcevic-Mitrovic, Z. and Šćepanović, Maja",
year = "2014",
abstract = "The influence of La-doping in the range of 0.5-6.0 mol% on structural and morphological properties of TiO2 nanopowders synthesized by sol-gel routine has been investigated by XRPD, AFM, EDS and BET measurements, as well as Raman spectroscopy. The XRPD and Raman measurements have revealed the anatase phase as dominant in all nanopowders, with crystallite size decreasing from similar to 15 nm in pure TiO2 to similar to 12 nm in La-doped samples. The BET data suggest that all samples are fully mesoporous, with mean pore diameters in the range of similar to 6-8 nm. The specific surface area and the complexity of pore structure are greater in doped samples than in pure TiO2 sample. The spectroscopic ellipsometry has apparently shown that the band gap has been gradually increased with the increase of La content. The STM and STS techniques have been used successfully to evaluate the surface morphology and electronic properties of La-doped nanopowders. All investigated properties have been related to photocatalytic activity, tested in degradation of a metoprolol tartrate salt (0.05 mM), and induced by UV-radiation. All doped samples showed increased photocatalytic activity compared to pure TiO2, among which the 0.65 mol% La-doped sample appeared to be the most efficient. (C) 2013 Elsevier Inc. All rights reserved.",
journal = "Materials Characterization",
title = "Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping",
volume = "88",
pages = "30-41",
doi = "10.1016/j.matchar.2013.12.002"
}

Grujić-Brojčin, M., Armaković, S. J., Tomić, N., Abramović, B. F., Golubavic, A., Stojadinovic, B., Kremenović, A. S., Babić, B. M., Dohcevic-Mitrovic, Z.,& Šćepanović, M.. (2014). Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping. in Materials Characterization, 88, 30-41.
https://doi.org/10.1016/j.matchar.2013.12.002

Grujić-Brojčin M, Armaković SJ, Tomić N, Abramović BF, Golubavic A, Stojadinovic B, Kremenović AS, Babić BM, Dohcevic-Mitrovic Z, Šćepanović M. Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping. in Materials Characterization. 2014;88:30-41.
doi:10.1016/j.matchar.2013.12.002 .

Grujić-Brojčin, Mirjana, Armaković, Sanja J., Tomić, Nataša, Abramović, Biljana F., Golubavic, A., Stojadinovic, B., Kremenović, Aleksandar S., Babić, Biljana M., Dohcevic-Mitrovic, Z., Šćepanović, Maja, "Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping" in Materials Characterization, 88 (2014):30-41,
https://doi.org/10.1016/j.matchar.2013.12.002 . .

TY  - JOUR
AU  - Nikolić, Aleksandar S.
AU  - Bošković, Marko
AU  - Fabian, Martin
AU  - Božanić, Dušan K.
AU  - Vučinić-Vasić, Milica
AU  - Kremenović, Aleksandar S.
AU  - Antić, Bratislav
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5813
AB  - Herein a comparative study of five nanocrystalline cerium oxides (CeO2-delta) synthesised by different methods and calcined at 500 degrees C is reported. XRPD analysis showed that stoichiometry parameter delta, crystallite size/strain and lattice constant were only slightly affected by the method utilized. All ceria nanoparticles are nearly spherical in shape with faceted morphology, free of defects and with a relatively uniform size distribution. The average microstrain was found to be approximately 10 times higher than that of bulk counterpart. The absorption edge of nanocrystalline materials was shifted towards a higher wavelengths (red shift) in comparison with bulk counterpart, and band gap values were in the range 2.7-3.24 eV (3.33 eV for bulk counterpart).
T2  - Journal of Nanoscience and Nanotechnology
T1  - Comparative Structural and Optical Properties of Different Ceria Nanoparticles
VL  - 13
IS  - 10
SP  - 6787
EP  - 6792
DO  - 10.1166/jnn.2013.7774
ER  - 

@article{
author = "Nikolić, Aleksandar S. and Bošković, Marko and Fabian, Martin and Božanić, Dušan K. and Vučinić-Vasić, Milica and Kremenović, Aleksandar S. and Antić, Bratislav",
year = "2013",
abstract = "Herein a comparative study of five nanocrystalline cerium oxides (CeO2-delta) synthesised by different methods and calcined at 500 degrees C is reported. XRPD analysis showed that stoichiometry parameter delta, crystallite size/strain and lattice constant were only slightly affected by the method utilized. All ceria nanoparticles are nearly spherical in shape with faceted morphology, free of defects and with a relatively uniform size distribution. The average microstrain was found to be approximately 10 times higher than that of bulk counterpart. The absorption edge of nanocrystalline materials was shifted towards a higher wavelengths (red shift) in comparison with bulk counterpart, and band gap values were in the range 2.7-3.24 eV (3.33 eV for bulk counterpart).",
journal = "Journal of Nanoscience and Nanotechnology",
title = "Comparative Structural and Optical Properties of Different Ceria Nanoparticles",
volume = "13",
number = "10",
pages = "6787-6792",
doi = "10.1166/jnn.2013.7774"
}

Nikolić, A. S., Bošković, M., Fabian, M., Božanić, D. K., Vučinić-Vasić, M., Kremenović, A. S.,& Antić, B.. (2013). Comparative Structural and Optical Properties of Different Ceria Nanoparticles. in Journal of Nanoscience and Nanotechnology, 13(10), 6787-6792.
https://doi.org/10.1166/jnn.2013.7774

Nikolić AS, Bošković M, Fabian M, Božanić DK, Vučinić-Vasić M, Kremenović AS, Antić B. Comparative Structural and Optical Properties of Different Ceria Nanoparticles. in Journal of Nanoscience and Nanotechnology. 2013;13(10):6787-6792.
doi:10.1166/jnn.2013.7774 .

Nikolić, Aleksandar S., Bošković, Marko, Fabian, Martin, Božanić, Dušan K., Vučinić-Vasić, Milica, Kremenović, Aleksandar S., Antić, Bratislav, "Comparative Structural and Optical Properties of Different Ceria Nanoparticles" in Journal of Nanoscience and Nanotechnology, 13, no. 10 (2013):6787-6792,
https://doi.org/10.1166/jnn.2013.7774 . .

TY  - JOUR
AU  - Pantić, Jelena R.
AU  - Prekajski, Marija D.
AU  - Dramićanin, Miroslav
AU  - Abazović, Nadica
AU  - Vuković, Nikola
AU  - Kremenović, Aleksandar S.
AU  - Matović, Branko
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5684
AB  - Mechanical activation of precursors has been used for the preparation of Cr-doped sphene ceramic pigments (CaTi1-yCrySiO5). Ceramic material has been prepared from a powder mixture of CaCO3, TiO2, SiO2 and Cr(NO3)center dot 9H(2)O using vibro-milling for homogenization and activation of precursors. The mechanochemical process initially yielded amorphous powders, which on further calcination, crystallized to yield Cr-doped sphene ceramic pigment. Phase evolution in CaTi1-yCrySiO5 composition with thermal treatment was investigated by X-ray powder diffraction (XRPD). Texture properties and particle size distribution were analyzed by scanning electron microscopy (SEM) and laser diffraction, respectively. UV/Vis reflectance spectra are used to determinate the behavior of the chromium ion. The color efficiency of pigments was evaluated by colorimetric analysis (CIE L * a * b system). Photoluminescence measurements were also performed. (c) 2013 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Preparation and characterization of chrome doped sphene pigments prepared via precursor mechanochemical activation
VL  - 579
SP  - 290
EP  - 294
DO  - 10.1016/j.jallcom.2013.06.046
ER  - 

@article{
author = "Pantić, Jelena R. and Prekajski, Marija D. and Dramićanin, Miroslav and Abazović, Nadica and Vuković, Nikola and Kremenović, Aleksandar S. and Matović, Branko",
year = "2013",
abstract = "Mechanical activation of precursors has been used for the preparation of Cr-doped sphene ceramic pigments (CaTi1-yCrySiO5). Ceramic material has been prepared from a powder mixture of CaCO3, TiO2, SiO2 and Cr(NO3)center dot 9H(2)O using vibro-milling for homogenization and activation of precursors. The mechanochemical process initially yielded amorphous powders, which on further calcination, crystallized to yield Cr-doped sphene ceramic pigment. Phase evolution in CaTi1-yCrySiO5 composition with thermal treatment was investigated by X-ray powder diffraction (XRPD). Texture properties and particle size distribution were analyzed by scanning electron microscopy (SEM) and laser diffraction, respectively. UV/Vis reflectance spectra are used to determinate the behavior of the chromium ion. The color efficiency of pigments was evaluated by colorimetric analysis (CIE L * a * b system). Photoluminescence measurements were also performed. (c) 2013 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Preparation and characterization of chrome doped sphene pigments prepared via precursor mechanochemical activation",
volume = "579",
pages = "290-294",
doi = "10.1016/j.jallcom.2013.06.046"
}

Pantić, J. R., Prekajski, M. D., Dramićanin, M., Abazović, N., Vuković, N., Kremenović, A. S.,& Matović, B.. (2013). Preparation and characterization of chrome doped sphene pigments prepared via precursor mechanochemical activation. in Journal of Alloys and Compounds, 579, 290-294.
https://doi.org/10.1016/j.jallcom.2013.06.046

Pantić JR, Prekajski MD, Dramićanin M, Abazović N, Vuković N, Kremenović AS, Matović B. Preparation and characterization of chrome doped sphene pigments prepared via precursor mechanochemical activation. in Journal of Alloys and Compounds. 2013;579:290-294.
doi:10.1016/j.jallcom.2013.06.046 .

Pantić, Jelena R., Prekajski, Marija D., Dramićanin, Miroslav, Abazović, Nadica, Vuković, Nikola, Kremenović, Aleksandar S., Matović, Branko, "Preparation and characterization of chrome doped sphene pigments prepared via precursor mechanochemical activation" in Journal of Alloys and Compounds, 579 (2013):290-294,
https://doi.org/10.1016/j.jallcom.2013.06.046 . .

TY  - JOUR
AU  - Pantić, Jelena R.
AU  - Kremenović, Aleksandar S.
AU  - Došen, Anja M.
AU  - Prekajski, Marija D.
AU  - Stanković, Nadežda
AU  - Baščarević, Zvezdana D.
AU  - Matović, Branko
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5325
AB  - Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibromilling for homogenization and activation of precursors. The mechanochemical process initially yielded amorphous powders, which on further calcination, crystallized to yield sphene ceramic. The evolution of the phase composition with thermal treatment was investigated by X-ray powder diffraction (XRPD). Powder morphology and particle size distribution were analyzed by scanning electron microscopy (SEM) and laser diffraction, respectively. Rietveld refinement was employed to get the structural information of the synthesized powder. Densification and microstructure evolution was determined by means of density and scanning electron microscopy (SEM). The most favorable conditions for mechanical activation and synthesis of sphene based ceramic material are reported. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Influence of mechanical activation on sphene based ceramic material synthesis
VL  - 39
IS  - 1
SP  - 483
EP  - 488
DO  - 10.1016/j.ceramint.2012.06.052
ER  - 

@article{
author = "Pantić, Jelena R. and Kremenović, Aleksandar S. and Došen, Anja M. and Prekajski, Marija D. and Stanković, Nadežda and Baščarević, Zvezdana D. and Matović, Branko",
year = "2013",
abstract = "Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibromilling for homogenization and activation of precursors. The mechanochemical process initially yielded amorphous powders, which on further calcination, crystallized to yield sphene ceramic. The evolution of the phase composition with thermal treatment was investigated by X-ray powder diffraction (XRPD). Powder morphology and particle size distribution were analyzed by scanning electron microscopy (SEM) and laser diffraction, respectively. Rietveld refinement was employed to get the structural information of the synthesized powder. Densification and microstructure evolution was determined by means of density and scanning electron microscopy (SEM). The most favorable conditions for mechanical activation and synthesis of sphene based ceramic material are reported. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Influence of mechanical activation on sphene based ceramic material synthesis",
volume = "39",
number = "1",
pages = "483-488",
doi = "10.1016/j.ceramint.2012.06.052"
}

Pantić, J. R., Kremenović, A. S., Došen, A. M., Prekajski, M. D., Stanković, N., Baščarević, Z. D.,& Matović, B.. (2013). Influence of mechanical activation on sphene based ceramic material synthesis. in Ceramics International, 39(1), 483-488.
https://doi.org/10.1016/j.ceramint.2012.06.052

Pantić JR, Kremenović AS, Došen AM, Prekajski MD, Stanković N, Baščarević ZD, Matović B. Influence of mechanical activation on sphene based ceramic material synthesis. in Ceramics International. 2013;39(1):483-488.
doi:10.1016/j.ceramint.2012.06.052 .

Pantić, Jelena R., Kremenović, Aleksandar S., Došen, Anja M., Prekajski, Marija D., Stanković, Nadežda, Baščarević, Zvezdana D., Matović, Branko, "Influence of mechanical activation on sphene based ceramic material synthesis" in Ceramics International, 39, no. 1 (2013):483-488,
https://doi.org/10.1016/j.ceramint.2012.06.052 . .

TY  - JOUR
AU  - Prekajski, Marija D.
AU  - Fruth, Viktor
AU  - Andronescu, Cristian
AU  - Trandafilović, Lidija V.
AU  - Pantić, Jelena R.
AU  - Kremenović, Aleksandar S.
AU  - Matović, Branko
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5678
AB  - Single phase solid solution Ce1-xBixO2-delta with the composition of x = 0.1-0.5 were successfully synthesized at room temperature using simple and fast Self Propagating Room Temperature procedure (SPRT). Thermal stability of these solid solutions with different concentration of Bi cation was investigated at various temperatures up to 1400 degrees C by applying thermogravimetric analysis (DTA/DTG/TG). Powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and Infra Red spectroscopy (IR). It was revealed that all samples with concentration of bismuth higher than 10 at.% are unstable during thermal treatment, resulting in Bi leaving the structure of ceria and formation of beta-Bi2O3 as second phase. Moreover, at a certain temperatures bismuth begins to evaporate. (c) 2013 Elsevier B. V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Thermal stability of Ce1-xBixO2-delta (x=0.1-0.5) solid solution
VL  - 578
SP  - 26
EP  - 31
DO  - 10.1016/j.jallcom.2013.05.006
ER  - 

@article{
author = "Prekajski, Marija D. and Fruth, Viktor and Andronescu, Cristian and Trandafilović, Lidija V. and Pantić, Jelena R. and Kremenović, Aleksandar S. and Matović, Branko",
year = "2013",
abstract = "Single phase solid solution Ce1-xBixO2-delta with the composition of x = 0.1-0.5 were successfully synthesized at room temperature using simple and fast Self Propagating Room Temperature procedure (SPRT). Thermal stability of these solid solutions with different concentration of Bi cation was investigated at various temperatures up to 1400 degrees C by applying thermogravimetric analysis (DTA/DTG/TG). Powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and Infra Red spectroscopy (IR). It was revealed that all samples with concentration of bismuth higher than 10 at.% are unstable during thermal treatment, resulting in Bi leaving the structure of ceria and formation of beta-Bi2O3 as second phase. Moreover, at a certain temperatures bismuth begins to evaporate. (c) 2013 Elsevier B. V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Thermal stability of Ce1-xBixO2-delta (x=0.1-0.5) solid solution",
volume = "578",
pages = "26-31",
doi = "10.1016/j.jallcom.2013.05.006"
}

Prekajski, M. D., Fruth, V., Andronescu, C., Trandafilović, L. V., Pantić, J. R., Kremenović, A. S.,& Matović, B.. (2013). Thermal stability of Ce1-xBixO2-delta (x=0.1-0.5) solid solution. in Journal of Alloys and Compounds, 578, 26-31.
https://doi.org/10.1016/j.jallcom.2013.05.006

Prekajski MD, Fruth V, Andronescu C, Trandafilović LV, Pantić JR, Kremenović AS, Matović B. Thermal stability of Ce1-xBixO2-delta (x=0.1-0.5) solid solution. in Journal of Alloys and Compounds. 2013;578:26-31.
doi:10.1016/j.jallcom.2013.05.006 .

Prekajski, Marija D., Fruth, Viktor, Andronescu, Cristian, Trandafilović, Lidija V., Pantić, Jelena R., Kremenović, Aleksandar S., Matović, Branko, "Thermal stability of Ce1-xBixO2-delta (x=0.1-0.5) solid solution" in Journal of Alloys and Compounds, 578 (2013):26-31,
https://doi.org/10.1016/j.jallcom.2013.05.006 . .

TY  - JOUR
AU  - Antić, Bratislav
AU  - Perović, Marija M.
AU  - Kremenović, Aleksandar S.
AU  - Blanuša, Jovan
AU  - Spasojević, Vojislav
AU  - Vulić, Predrag J.
AU  - Bessais, Lotfi
AU  - Božin, Emil S.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5305
AB  - The evolution of the magnetic state, crystal structure and microstructure parameters of nanocrystalline zinc-ferrite, tuned by thermal annealing of similar to 4 nm nanoparticles, was systematically studied by complementary characterization methods. Structural analysis of neutron and synchrotron x-ray radiation data revealed a mixed cation distribution in the nanoparticle samples, with the degree of inversion systematically decreasing from 0.25 in an as-prepared nanocrystalline sample to a non-inverted spinel structure with a normal cation distribution in the bulk counterpart. The results of DC magnetization and Mossbauer spectroscopy experiments indicated a superparamagnetic relaxation in similar to 4 nm nanoparticles, albeit with different freezing temperatures T-f of 27.5 K and 46 K, respectively. The quadrupole splitting parameter decreases with the annealing temperature due to cation redistribution between the tetrahedral and octahedral sites of the spinel structure and the associated defects. DC magnetization measurements indicated the existence of significant interparticle interactions among nanoparticles (superspins). Additional confirmation for the presence of interparticle interactions was found from the fit of the Tf(H) dependence to the AT line, from which a value of the anisotropy constant of K-eff = 5.6 x 10(5) erg cm(-3) was deduced. Further evidence for strong interparticle interactions was found from AC susceptibility measurements, where the frequency dependence of the freezing temperature T-f(f) was satisfactory described by both Vogel-Fulcher and dynamic scaling theory, both applicable for interacting systems. The parameters obtained from these fits suggest collective freezing of magnetic moments at T-f.
T2  - Journal of Physics: Condensed Matter
T1  - An integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn-ferrite nanoparticles
VL  - 25
IS  - 8
DO  - 10.1088/0953-8984/25/8/086001
ER  - 

@article{
author = "Antić, Bratislav and Perović, Marija M. and Kremenović, Aleksandar S. and Blanuša, Jovan and Spasojević, Vojislav and Vulić, Predrag J. and Bessais, Lotfi and Božin, Emil S.",
year = "2013",
abstract = "The evolution of the magnetic state, crystal structure and microstructure parameters of nanocrystalline zinc-ferrite, tuned by thermal annealing of similar to 4 nm nanoparticles, was systematically studied by complementary characterization methods. Structural analysis of neutron and synchrotron x-ray radiation data revealed a mixed cation distribution in the nanoparticle samples, with the degree of inversion systematically decreasing from 0.25 in an as-prepared nanocrystalline sample to a non-inverted spinel structure with a normal cation distribution in the bulk counterpart. The results of DC magnetization and Mossbauer spectroscopy experiments indicated a superparamagnetic relaxation in similar to 4 nm nanoparticles, albeit with different freezing temperatures T-f of 27.5 K and 46 K, respectively. The quadrupole splitting parameter decreases with the annealing temperature due to cation redistribution between the tetrahedral and octahedral sites of the spinel structure and the associated defects. DC magnetization measurements indicated the existence of significant interparticle interactions among nanoparticles (superspins). Additional confirmation for the presence of interparticle interactions was found from the fit of the Tf(H) dependence to the AT line, from which a value of the anisotropy constant of K-eff = 5.6 x 10(5) erg cm(-3) was deduced. Further evidence for strong interparticle interactions was found from AC susceptibility measurements, where the frequency dependence of the freezing temperature T-f(f) was satisfactory described by both Vogel-Fulcher and dynamic scaling theory, both applicable for interacting systems. The parameters obtained from these fits suggest collective freezing of magnetic moments at T-f.",
journal = "Journal of Physics: Condensed Matter",
title = "An integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn-ferrite nanoparticles",
volume = "25",
number = "8",
doi = "10.1088/0953-8984/25/8/086001"
}

Antić, B., Perović, M. M., Kremenović, A. S., Blanuša, J., Spasojević, V., Vulić, P. J., Bessais, L.,& Božin, E. S.. (2013). An integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn-ferrite nanoparticles. in Journal of Physics: Condensed Matter, 25(8).
https://doi.org/10.1088/0953-8984/25/8/086001

Antić B, Perović MM, Kremenović AS, Blanuša J, Spasojević V, Vulić PJ, Bessais L, Božin ES. An integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn-ferrite nanoparticles. in Journal of Physics: Condensed Matter. 2013;25(8).
doi:10.1088/0953-8984/25/8/086001 .

Antić, Bratislav, Perović, Marija M., Kremenović, Aleksandar S., Blanuša, Jovan, Spasojević, Vojislav, Vulić, Predrag J., Bessais, Lotfi, Božin, Emil S., "An integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn-ferrite nanoparticles" in Journal of Physics: Condensed Matter, 25, no. 8 (2013),
https://doi.org/10.1088/0953-8984/25/8/086001 . .

TY  - JOUR
AU  - Nikolić, Aleksandar S.
AU  - Jović, Nataša G.
AU  - Rogan, Jelena R.
AU  - Kremenović, Aleksandar S.
AU  - Ristić, Mira
AU  - Meden, A.
AU  - Antić, Bratislav
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5544
AB  - Different synthesis methods for the preparation of nanocrystalline nickel ferrites are reported: the thermal decomposition of precursors, made of: (i) metal-nitrate salts with carboxylic acids (citric, malonic and tartaric), and (ii) metal-nitrate salts and polyethylene glycol (PEG), in the presence of potassium chloride as a capping agent. The as-prepared gel precursors were characterized by TGA/DTA, while the samples obtained after annealing at 450 degrees C were investigated by FTIR, FESEM, XRD and Mossbauer spectroscopy. Regardless of the type of carboxylic acid used, nanocrystallites prepared by (i) method are similar in size (11-16 nm), while the method (ii) gives crystallites similar to 33 nm in size with negligible microstrain. The differences in the lattice parameter, ranging from 8.3369(2) to 8.3574(2) angstrom, result from cation distribution, nonstoichiometry and structural imperfections in the nickel ferrite nanoparticles. The Mossbauer spectra analysis indicates existence of large distortions of tetrahedral and octahedral sites in these spinel compounds. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites
VL  - 39
IS  - 6
SP  - 6681
EP  - 6688
DO  - 10.1016/j.ceramint.2013.01.106
ER  - 

@article{
author = "Nikolić, Aleksandar S. and Jović, Nataša G. and Rogan, Jelena R. and Kremenović, Aleksandar S. and Ristić, Mira and Meden, A. and Antić, Bratislav",
year = "2013",
abstract = "Different synthesis methods for the preparation of nanocrystalline nickel ferrites are reported: the thermal decomposition of precursors, made of: (i) metal-nitrate salts with carboxylic acids (citric, malonic and tartaric), and (ii) metal-nitrate salts and polyethylene glycol (PEG), in the presence of potassium chloride as a capping agent. The as-prepared gel precursors were characterized by TGA/DTA, while the samples obtained after annealing at 450 degrees C were investigated by FTIR, FESEM, XRD and Mossbauer spectroscopy. Regardless of the type of carboxylic acid used, nanocrystallites prepared by (i) method are similar in size (11-16 nm), while the method (ii) gives crystallites similar to 33 nm in size with negligible microstrain. The differences in the lattice parameter, ranging from 8.3369(2) to 8.3574(2) angstrom, result from cation distribution, nonstoichiometry and structural imperfections in the nickel ferrite nanoparticles. The Mossbauer spectra analysis indicates existence of large distortions of tetrahedral and octahedral sites in these spinel compounds. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites",
volume = "39",
number = "6",
pages = "6681-6688",
doi = "10.1016/j.ceramint.2013.01.106"
}

Nikolić, A. S., Jović, N. G., Rogan, J. R., Kremenović, A. S., Ristić, M., Meden, A.,& Antić, B.. (2013). Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites. in Ceramics International, 39(6), 6681-6688.
https://doi.org/10.1016/j.ceramint.2013.01.106

Nikolić AS, Jović NG, Rogan JR, Kremenović AS, Ristić M, Meden A, Antić B. Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites. in Ceramics International. 2013;39(6):6681-6688.
doi:10.1016/j.ceramint.2013.01.106 .

Nikolić, Aleksandar S., Jović, Nataša G., Rogan, Jelena R., Kremenović, Aleksandar S., Ristić, Mira, Meden, A., Antić, Bratislav, "Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites" in Ceramics International, 39, no. 6 (2013):6681-6688,
https://doi.org/10.1016/j.ceramint.2013.01.106 . .

TY  - JOUR
AU  - Vučinić-Vasić, Milica
AU  - Božin, Emil S.
AU  - Bessais, Lotfi
AU  - Stojanovic, G.
AU  - Kozmidis-Luburic, U.
AU  - Abeykoon, M.
AU  - Jančar, Boštjan
AU  - Meden, A.
AU  - Kremenović, Aleksandar S.
AU  - Antić, Bratislav
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5555
AB  - Evolution of the structural and magnetic properties of ZnFe1.95Yb0.05O4 nanoparticles, prepared via a high-energy ball milling route and exposed to further thermal annealing/heating, was assessed in detail and correlation of these properties explored. inversion, heating of the sample to similar to 500 degrees C is found to rapidly alter the cation distribution from mixed to normal, in agreement with the known cation preferences. Under the same conditions the crystallite size only slowly grows. By further thermal treatment appreciably. An interrelationship among the lattice parameter, octahedral site occupancy, and crystallite size has been established. The observations are (a) both the site occupancy of Fe3+ at octahedral 16d spinel sites (N-16d(Fe3+)) and the cubic lattice parameter rapidly increase with an initial increase of the crystallite size, (b) the lattice parameter increases with increasing occupancy, N-16d(Fe3+), and (c) there appears to be a critical nanoparticle diameter (approximately 15 nm) above which both the site occupancy and lattice parameter values are saturated. The magnetic behavior of the annealed samples appears to be correlated to the evolution of both the cation distribution and crystallite size, as follows. As-prepared samples and those annealed at lower temperatures show superparamagnetic behavior at room temperature, presumably as a consequence of the Fe3+ distribution and strong Fe3+(8a)-O-Fe3+(16d) superexchange interactions. Samples with a nanopartide diameter greater than 12 nm and with almost normal distributions exhibit the paramagnetic state. The coercive field is found to decrease with an increase of the crystallite size. Partial Yb3+/Fe3+ substitution is found to increase the inversion parameter and saturation magnetization. Detailed knowledge of the thermal evolution of structural/microstructural parameters allows control over the cation distribution and crystallite size and hence the magnetic properties of nanoferrites.
T2  - Journal of Physical Chemistry. C
T1  - Thermal Evolution of Cation Distribution/Crystallite Size and Their Correlation with the Magnetic State of Yb-Substituted Zinc Ferrite Nanoparticles
VL  - 117
IS  - 23
SP  - 12358
EP  - 12365
DO  - 10.1021/jp403459t
ER  - 

@article{
author = "Vučinić-Vasić, Milica and Božin, Emil S. and Bessais, Lotfi and Stojanovic, G. and Kozmidis-Luburic, U. and Abeykoon, M. and Jančar, Boštjan and Meden, A. and Kremenović, Aleksandar S. and Antić, Bratislav",
year = "2013",
abstract = "Evolution of the structural and magnetic properties of ZnFe1.95Yb0.05O4 nanoparticles, prepared via a high-energy ball milling route and exposed to further thermal annealing/heating, was assessed in detail and correlation of these properties explored. inversion, heating of the sample to similar to 500 degrees C is found to rapidly alter the cation distribution from mixed to normal, in agreement with the known cation preferences. Under the same conditions the crystallite size only slowly grows. By further thermal treatment appreciably. An interrelationship among the lattice parameter, octahedral site occupancy, and crystallite size has been established. The observations are (a) both the site occupancy of Fe3+ at octahedral 16d spinel sites (N-16d(Fe3+)) and the cubic lattice parameter rapidly increase with an initial increase of the crystallite size, (b) the lattice parameter increases with increasing occupancy, N-16d(Fe3+), and (c) there appears to be a critical nanoparticle diameter (approximately 15 nm) above which both the site occupancy and lattice parameter values are saturated. The magnetic behavior of the annealed samples appears to be correlated to the evolution of both the cation distribution and crystallite size, as follows. As-prepared samples and those annealed at lower temperatures show superparamagnetic behavior at room temperature, presumably as a consequence of the Fe3+ distribution and strong Fe3+(8a)-O-Fe3+(16d) superexchange interactions. Samples with a nanopartide diameter greater than 12 nm and with almost normal distributions exhibit the paramagnetic state. The coercive field is found to decrease with an increase of the crystallite size. Partial Yb3+/Fe3+ substitution is found to increase the inversion parameter and saturation magnetization. Detailed knowledge of the thermal evolution of structural/microstructural parameters allows control over the cation distribution and crystallite size and hence the magnetic properties of nanoferrites.",
journal = "Journal of Physical Chemistry. C",
title = "Thermal Evolution of Cation Distribution/Crystallite Size and Their Correlation with the Magnetic State of Yb-Substituted Zinc Ferrite Nanoparticles",
volume = "117",
number = "23",
pages = "12358-12365",
doi = "10.1021/jp403459t"
}

Vučinić-Vasić, M., Božin, E. S., Bessais, L., Stojanovic, G., Kozmidis-Luburic, U., Abeykoon, M., Jančar, B., Meden, A., Kremenović, A. S.,& Antić, B.. (2013). Thermal Evolution of Cation Distribution/Crystallite Size and Their Correlation with the Magnetic State of Yb-Substituted Zinc Ferrite Nanoparticles. in Journal of Physical Chemistry. C, 117(23), 12358-12365.
https://doi.org/10.1021/jp403459t

Vučinić-Vasić M, Božin ES, Bessais L, Stojanovic G, Kozmidis-Luburic U, Abeykoon M, Jančar B, Meden A, Kremenović AS, Antić B. Thermal Evolution of Cation Distribution/Crystallite Size and Their Correlation with the Magnetic State of Yb-Substituted Zinc Ferrite Nanoparticles. in Journal of Physical Chemistry. C. 2013;117(23):12358-12365.
doi:10.1021/jp403459t .

Vučinić-Vasić, Milica, Božin, Emil S., Bessais, Lotfi, Stojanovic, G., Kozmidis-Luburic, U., Abeykoon, M., Jančar, Boštjan, Meden, A., Kremenović, Aleksandar S., Antić, Bratislav, "Thermal Evolution of Cation Distribution/Crystallite Size and Their Correlation with the Magnetic State of Yb-Substituted Zinc Ferrite Nanoparticles" in Journal of Physical Chemistry. C, 117, no. 23 (2013):12358-12365,
https://doi.org/10.1021/jp403459t . .

TY  - JOUR
AU  - Kremenović, Aleksandar S.
AU  - Božanić, Dušan K.
AU  - Welsch, A. -M.
AU  - Jančar, Boštjan
AU  - Nikolić, Aleksandar S.
AU  - Bošković, Marko
AU  - Colomban, Ph.
AU  - Fabian, Martin
AU  - Antić, Bratislav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5320
AB  - The 5-10 nnn Ce1-XEuXO2-delta (0 LT = x LT = 0.30) nanoparticles with fluorite structure were synthesized by thermal decomposition of Eu- and Ce-2,4-pentanedione complexes mixtures. X-ray line broadening analysis of mixed samples Ce1-XEuXO2-delta (0.05 LT = x LT = 0.30) showed that the crystallite size was lower and root mean square strain higher than in pure ceria. However, within mixed samples Ce1-XEuXO2-delta (0.05 LT = x LT = 0.30) crystallite size and root mean square strain were independent of Eu3+ concentration. Raman spectroscopy results indicated that europium ions yield disorder by breaking the phonon propagation and therefore making the non-centre Brillouin zone modes Raman active. The absorption bands in the spectra of mixed oxides were blue-shifted in comparison to pure CeO2-delta nanopowder. The samples show red emission typical for Eu ions. The biggest photoluminescent intensity was observed for the highest Eu3+ concentration (x = 0.30) and further enhanced with the increase in crystallinity.
T2  - Journal of Nanoscience and Nanotechnology
T1  - Effects of Eu3+ Concentration on Structural, Optical and Vibrational Properties of Multifunctional Ce1-X,EuXO2-delta Nanoparticles Synthesized by Thermolysis of 2,4-Pentanedione Complexes
VL  - 12
IS  - 12
SP  - 8893
EP  - 8899
DO  - 10.1166/jnn.2012.6797
ER  - 

@article{
author = "Kremenović, Aleksandar S. and Božanić, Dušan K. and Welsch, A. -M. and Jančar, Boštjan and Nikolić, Aleksandar S. and Bošković, Marko and Colomban, Ph. and Fabian, Martin and Antić, Bratislav",
year = "2012",
abstract = "The 5-10 nnn Ce1-XEuXO2-delta (0 LT = x LT = 0.30) nanoparticles with fluorite structure were synthesized by thermal decomposition of Eu- and Ce-2,4-pentanedione complexes mixtures. X-ray line broadening analysis of mixed samples Ce1-XEuXO2-delta (0.05 LT = x LT = 0.30) showed that the crystallite size was lower and root mean square strain higher than in pure ceria. However, within mixed samples Ce1-XEuXO2-delta (0.05 LT = x LT = 0.30) crystallite size and root mean square strain were independent of Eu3+ concentration. Raman spectroscopy results indicated that europium ions yield disorder by breaking the phonon propagation and therefore making the non-centre Brillouin zone modes Raman active. The absorption bands in the spectra of mixed oxides were blue-shifted in comparison to pure CeO2-delta nanopowder. The samples show red emission typical for Eu ions. The biggest photoluminescent intensity was observed for the highest Eu3+ concentration (x = 0.30) and further enhanced with the increase in crystallinity.",
journal = "Journal of Nanoscience and Nanotechnology",
title = "Effects of Eu3+ Concentration on Structural, Optical and Vibrational Properties of Multifunctional Ce1-X,EuXO2-delta Nanoparticles Synthesized by Thermolysis of 2,4-Pentanedione Complexes",
volume = "12",
number = "12",
pages = "8893-8899",
doi = "10.1166/jnn.2012.6797"
}

Kremenović, A. S., Božanić, D. K., Welsch, A. -M., Jančar, B., Nikolić, A. S., Bošković, M., Colomban, Ph., Fabian, M.,& Antić, B.. (2012). Effects of Eu3+ Concentration on Structural, Optical and Vibrational Properties of Multifunctional Ce1-X,EuXO2-delta Nanoparticles Synthesized by Thermolysis of 2,4-Pentanedione Complexes. in Journal of Nanoscience and Nanotechnology, 12(12), 8893-8899.
https://doi.org/10.1166/jnn.2012.6797

Kremenović AS, Božanić DK, Welsch A-, Jančar B, Nikolić AS, Bošković M, Colomban P, Fabian M, Antić B. Effects of Eu3+ Concentration on Structural, Optical and Vibrational Properties of Multifunctional Ce1-X,EuXO2-delta Nanoparticles Synthesized by Thermolysis of 2,4-Pentanedione Complexes. in Journal of Nanoscience and Nanotechnology. 2012;12(12):8893-8899.
doi:10.1166/jnn.2012.6797 .

Kremenović, Aleksandar S., Božanić, Dušan K., Welsch, A. -M., Jančar, Boštjan, Nikolić, Aleksandar S., Bošković, Marko, Colomban, Ph., Fabian, Martin, Antić, Bratislav, "Effects of Eu3+ Concentration on Structural, Optical and Vibrational Properties of Multifunctional Ce1-X,EuXO2-delta Nanoparticles Synthesized by Thermolysis of 2,4-Pentanedione Complexes" in Journal of Nanoscience and Nanotechnology, 12, no. 12 (2012):8893-8899,
https://doi.org/10.1166/jnn.2012.6797 . .

TY  - JOUR
AU  - Prekajski, Marija D.
AU  - Dohcevic-Mitrovic, Z.
AU  - Radović, Marko B.
AU  - Babić, Biljana M.
AU  - Pantić, Jelena R.
AU  - Kremenović, Aleksandar S.
AU  - Matović, Branko
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4832
AB  - Nanocrystalline powders of solid solution CeO2-Bi2O3 were synthesized by self-propagating room temperature reaction (SPRT) procedure with composition (Ce1-xBixO2-delta where the x = 0.1-0.5). X-ray diffraction analyses show that for x LT 0.50 a solid solution with fluorite structure is formed. Rietvelds structure refinement method was applied to characterize prepared powders and its microstructure (size strain). The lattice parameters increase according to Vegards rule with increasing of Bi concentration. The average crystallite size is about 2-3 nm. Spectroscopic ellipsometry and Raman scattering measurements were used to characterize the samples at room temperature. The Raman measurements demonstrated electron molecular vibrational coupling and increase of oxygen vacancy concentration whereas increase of Bi content provokes a small decrease of optical absorption edge in comparison with pure ceria. Specific surface area of obtained powders was measured by Brunauer-Emmet-Teller (BET) method. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - Journal of the European Ceramic Society
T1  - Nanocrystaline solid solution CeO2-Bi2O3
VL  - 32
IS  - 9
SP  - 1983
EP  - 1987
DO  - 10.1016/j.jeurceramsoc.2011.12.009
ER  - 

@article{
author = "Prekajski, Marija D. and Dohcevic-Mitrovic, Z. and Radović, Marko B. and Babić, Biljana M. and Pantić, Jelena R. and Kremenović, Aleksandar S. and Matović, Branko",
year = "2012",
abstract = "Nanocrystalline powders of solid solution CeO2-Bi2O3 were synthesized by self-propagating room temperature reaction (SPRT) procedure with composition (Ce1-xBixO2-delta where the x = 0.1-0.5). X-ray diffraction analyses show that for x LT 0.50 a solid solution with fluorite structure is formed. Rietvelds structure refinement method was applied to characterize prepared powders and its microstructure (size strain). The lattice parameters increase according to Vegards rule with increasing of Bi concentration. The average crystallite size is about 2-3 nm. Spectroscopic ellipsometry and Raman scattering measurements were used to characterize the samples at room temperature. The Raman measurements demonstrated electron molecular vibrational coupling and increase of oxygen vacancy concentration whereas increase of Bi content provokes a small decrease of optical absorption edge in comparison with pure ceria. Specific surface area of obtained powders was measured by Brunauer-Emmet-Teller (BET) method. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "Journal of the European Ceramic Society",
title = "Nanocrystaline solid solution CeO2-Bi2O3",
volume = "32",
number = "9",
pages = "1983-1987",
doi = "10.1016/j.jeurceramsoc.2011.12.009"
}

Prekajski, M. D., Dohcevic-Mitrovic, Z., Radović, M. B., Babić, B. M., Pantić, J. R., Kremenović, A. S.,& Matović, B.. (2012). Nanocrystaline solid solution CeO2-Bi2O3. in Journal of the European Ceramic Society, 32(9), 1983-1987.
https://doi.org/10.1016/j.jeurceramsoc.2011.12.009

Prekajski MD, Dohcevic-Mitrovic Z, Radović MB, Babić BM, Pantić JR, Kremenović AS, Matović B. Nanocrystaline solid solution CeO2-Bi2O3. in Journal of the European Ceramic Society. 2012;32(9):1983-1987.
doi:10.1016/j.jeurceramsoc.2011.12.009 .

Prekajski, Marija D., Dohcevic-Mitrovic, Z., Radović, Marko B., Babić, Biljana M., Pantić, Jelena R., Kremenović, Aleksandar S., Matović, Branko, "Nanocrystaline solid solution CeO2-Bi2O3" in Journal of the European Ceramic Society, 32, no. 9 (2012):1983-1987,
https://doi.org/10.1016/j.jeurceramsoc.2011.12.009 . .

TY  - CONF
AU  - Prekajski, Marija D.
AU  - Stanković, Nadežda
AU  - Čebela, Maria
AU  - Minović-Arsić, Tamara
AU  - Kremenović, Aleksandar S.
AU  - Matović, Branko
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7013
AB  - Nanocrystaline powders of solid solution Ce1-xBixO2-delta with the composition of x = 0.1 - 0.5 were synthesized at room temperature using Self Propagating Room Temperature procedure (SPRT). Obtained results show that all synthesized powders were single-phase solid solution at room temperature (XRPD and Raman spectroscopy). Thermal stability of these solid solutions with different concentration of Bi was investigated at various temperatures in the range of 600 - 1200 degrees C. It was revealed that all samples with higher Bi ion concentration are unstable during thermal treatment resulting in formation of alpha-Bi2O3 as second phase. Also the detail characterization is done of all samples (crystallite size, strain-stress, powder morphology, BET).
C3  - ModTech International Conference : 16th International Conference on Modern Technologies, Quality and Innovation, May 24-26, Sinaia, Romania
T1  - Thermal Stability of Ceo2 - Bi2o3 Solid Solution
SP  - 809
EP  - 812
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7013
ER  - 

@conference{
author = "Prekajski, Marija D. and Stanković, Nadežda and Čebela, Maria and Minović-Arsić, Tamara and Kremenović, Aleksandar S. and Matović, Branko",
year = "2012",
abstract = "Nanocrystaline powders of solid solution Ce1-xBixO2-delta with the composition of x = 0.1 - 0.5 were synthesized at room temperature using Self Propagating Room Temperature procedure (SPRT). Obtained results show that all synthesized powders were single-phase solid solution at room temperature (XRPD and Raman spectroscopy). Thermal stability of these solid solutions with different concentration of Bi was investigated at various temperatures in the range of 600 - 1200 degrees C. It was revealed that all samples with higher Bi ion concentration are unstable during thermal treatment resulting in formation of alpha-Bi2O3 as second phase. Also the detail characterization is done of all samples (crystallite size, strain-stress, powder morphology, BET).",
journal = "ModTech International Conference : 16th International Conference on Modern Technologies, Quality and Innovation, May 24-26, Sinaia, Romania",
title = "Thermal Stability of Ceo2 - Bi2o3 Solid Solution",
pages = "809-812",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7013"
}

Prekajski, M. D., Stanković, N., Čebela, M., Minović-Arsić, T., Kremenović, A. S.,& Matović, B.. (2012). Thermal Stability of Ceo2 - Bi2o3 Solid Solution. in ModTech International Conference : 16th International Conference on Modern Technologies, Quality and Innovation, May 24-26, Sinaia, Romania, 809-812.
https://hdl.handle.net/21.15107/rcub_vinar_7013

Prekajski MD, Stanković N, Čebela M, Minović-Arsić T, Kremenović AS, Matović B. Thermal Stability of Ceo2 - Bi2o3 Solid Solution. in ModTech International Conference : 16th International Conference on Modern Technologies, Quality and Innovation, May 24-26, Sinaia, Romania. 2012;:809-812.
https://hdl.handle.net/21.15107/rcub_vinar_7013 .

Prekajski, Marija D., Stanković, Nadežda, Čebela, Maria, Minović-Arsić, Tamara, Kremenović, Aleksandar S., Matović, Branko, "Thermal Stability of Ceo2 - Bi2o3 Solid Solution" in ModTech International Conference : 16th International Conference on Modern Technologies, Quality and Innovation, May 24-26, Sinaia, Romania (2012):809-812,
https://hdl.handle.net/21.15107/rcub_vinar_7013 .

TY  - JOUR
AU  - Jović, Nataša G.
AU  - Prekajski, Marija D.
AU  - Kremenović, Aleksandar S.
AU  - Jančar, Boštjan
AU  - Kahlenberg, V.
AU  - Antić, Bratislav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4721
AB  - alpha-lithium ferrite (Li0.5Fe2.5O4) nanoparticles have been prepared using two synthesis routes: citrate gel decomposition as well as the Pechini method. Analysis of HRTEM images of the particles showed that they have a core/shell structure, an average size of similar to 10 nm and stacking faults parallel to the (110) planes. In both samples, the distribution of the Li and Fe cations was found to be partially ordered on the octahedral sites (Wyckoff positions 4b and 12d of space group P4(3)32). According to literature data, Li0.5Fe2.5O4 should adopt a disordered spinel structure (so called beta-phase, space group Fd (3) over barm) for crystallites of 10 nm or less in size. In this study it is shown that (a) the symmetry of the Li0.5Fe2.5O4 nanoparticles depends on the degree of their crystallinity and (b) the ordered crystal structures can be formed even for crystallites of 5-6 nm in size. By fitting the room temperature Mossbauer spectra it was obtained that the hyperfine field values are lower in the sample synthesized by the Pechini method. The Pechini process probably resulted in larger distortions of the cation environments than the citrate gel decomposition method. The saturation magnetization in turn was higher for the material obtained by the gel decomposition approach. (C) 2012 American Institute of Physics. [doi:10.1063/1.3684554]
T2  - Journal of Applied Physics
T1  - Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles
VL  - 111
IS  - 3
DO  - 10.1063/1.3684554
ER  - 

@article{
author = "Jović, Nataša G. and Prekajski, Marija D. and Kremenović, Aleksandar S. and Jančar, Boštjan and Kahlenberg, V. and Antić, Bratislav",
year = "2012",
abstract = "alpha-lithium ferrite (Li0.5Fe2.5O4) nanoparticles have been prepared using two synthesis routes: citrate gel decomposition as well as the Pechini method. Analysis of HRTEM images of the particles showed that they have a core/shell structure, an average size of similar to 10 nm and stacking faults parallel to the (110) planes. In both samples, the distribution of the Li and Fe cations was found to be partially ordered on the octahedral sites (Wyckoff positions 4b and 12d of space group P4(3)32). According to literature data, Li0.5Fe2.5O4 should adopt a disordered spinel structure (so called beta-phase, space group Fd (3) over barm) for crystallites of 10 nm or less in size. In this study it is shown that (a) the symmetry of the Li0.5Fe2.5O4 nanoparticles depends on the degree of their crystallinity and (b) the ordered crystal structures can be formed even for crystallites of 5-6 nm in size. By fitting the room temperature Mossbauer spectra it was obtained that the hyperfine field values are lower in the sample synthesized by the Pechini method. The Pechini process probably resulted in larger distortions of the cation environments than the citrate gel decomposition method. The saturation magnetization in turn was higher for the material obtained by the gel decomposition approach. (C) 2012 American Institute of Physics. [doi:10.1063/1.3684554]",
journal = "Journal of Applied Physics",
title = "Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles",
volume = "111",
number = "3",
doi = "10.1063/1.3684554"
}

Jović, N. G., Prekajski, M. D., Kremenović, A. S., Jančar, B., Kahlenberg, V.,& Antić, B.. (2012). Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles. in Journal of Applied Physics, 111(3).
https://doi.org/10.1063/1.3684554

Jović NG, Prekajski MD, Kremenović AS, Jančar B, Kahlenberg V, Antić B. Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles. in Journal of Applied Physics. 2012;111(3).
doi:10.1063/1.3684554 .

Jović, Nataša G., Prekajski, Marija D., Kremenović, Aleksandar S., Jančar, Boštjan, Kahlenberg, V., Antić, Bratislav, "Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles" in Journal of Applied Physics, 111, no. 3 (2012),
https://doi.org/10.1063/1.3684554 . .

TY  - JOUR
AU  - Antić, Bratislav
AU  - Kremenović, Aleksandar S.
AU  - Jović, Nataša G.
AU  - Pavlović, Miodrag B.
AU  - Jovalekić, Čedomir
AU  - Nikolić, Aleksandar S.
AU  - Goya, Gerardo F.
AU  - Weidenthaler, C.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6946
AB  - We present a study of the structural and magnetic properties of (Mn,Fe)(3-delta)O-4 nanoparticles synthesized by soft mechanochemistry using Mn(OH)(2) x 2 H2O and Fe(OH)(3) powders as starting compounds. The resulting nanoparticles with a composition of the (Mn,Fe)(3-delta)O-4 type are found to have a core/shell structure with different Mn/Fe ratios in the core and at the surface. XPS analysis points to valences of +2, +3, and +4 for Mn and +3 for Fe at the particle surface. Combined results of XRPD, Mossbauer spectroscopy, and EDX analysis suggest that there is a deviation from stoichiometry in the nanoparticle core compared to the shell, accompanied by creation of cation polyvalence and vacancies. The value of saturation magnetization, M-S, of 73.5 emu/g at room temperature, is among the highest reported so far among nanocrystalline ferrite systems of similar composition. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3700228]
T2  - Journal of Applied Physics
T1  - Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe)(3-delta)O-4 nanoparticles
VL  - 111
IS  - 7
DO  - 10.1063/1.3700228
ER  - 

@article{
author = "Antić, Bratislav and Kremenović, Aleksandar S. and Jović, Nataša G. and Pavlović, Miodrag B. and Jovalekić, Čedomir and Nikolić, Aleksandar S. and Goya, Gerardo F. and Weidenthaler, C.",
year = "2012",
abstract = "We present a study of the structural and magnetic properties of (Mn,Fe)(3-delta)O-4 nanoparticles synthesized by soft mechanochemistry using Mn(OH)(2) x 2 H2O and Fe(OH)(3) powders as starting compounds. The resulting nanoparticles with a composition of the (Mn,Fe)(3-delta)O-4 type are found to have a core/shell structure with different Mn/Fe ratios in the core and at the surface. XPS analysis points to valences of +2, +3, and +4 for Mn and +3 for Fe at the particle surface. Combined results of XRPD, Mossbauer spectroscopy, and EDX analysis suggest that there is a deviation from stoichiometry in the nanoparticle core compared to the shell, accompanied by creation of cation polyvalence and vacancies. The value of saturation magnetization, M-S, of 73.5 emu/g at room temperature, is among the highest reported so far among nanocrystalline ferrite systems of similar composition. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3700228]",
journal = "Journal of Applied Physics",
title = "Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe)(3-delta)O-4 nanoparticles",
volume = "111",
number = "7",
doi = "10.1063/1.3700228"
}

Antić, B., Kremenović, A. S., Jović, N. G., Pavlović, M. B., Jovalekić, Č., Nikolić, A. S., Goya, G. F.,& Weidenthaler, C.. (2012). Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe)(3-delta)O-4 nanoparticles. in Journal of Applied Physics, 111(7).
https://doi.org/10.1063/1.3700228

Antić B, Kremenović AS, Jović NG, Pavlović MB, Jovalekić Č, Nikolić AS, Goya GF, Weidenthaler C. Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe)(3-delta)O-4 nanoparticles. in Journal of Applied Physics. 2012;111(7).
doi:10.1063/1.3700228 .

Antić, Bratislav, Kremenović, Aleksandar S., Jović, Nataša G., Pavlović, Miodrag B., Jovalekić, Čedomir, Nikolić, Aleksandar S., Goya, Gerardo F., Weidenthaler, C., "Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe)(3-delta)O-4 nanoparticles" in Journal of Applied Physics, 111, no. 7 (2012),
https://doi.org/10.1063/1.3700228 . .

TY  - JOUR
AU  - Askrabic, S.
AU  - Dohcevic-Mitrovic, Z.
AU  - Kremenović, Aleksandar S.
AU  - Lazarević, Nataša
AU  - Kahlenberg, V.
AU  - Popović, Zoran V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4661
AB  - Nanocrystalline ceria (CeO2) is known for its ionic conductivity and oxygen storage properties, which depend on the presence of oxygen ion vacancies. The vacancies cause several important changes in CeO2 involving microstrain, electronic structure, magnetic properties, etc. In this article, we focus our attention to the microstructural changes of nanocrystalline CeO2-x annealed at different temperatures in the range 200500 degrees C. Structural and vibrational properties were investigated by X-ray diffraction and Raman spectroscopy. It was observed that the content of oxygen vacancies changed significantly with increasing annealing temperature, which plays an important role in the observed microstructural changes of the annealed samples. We demonstrate that the observed microstrain changes, because of variable defect content, dominate over the crystallite size effect. This finding is opposite to the conclusions made by several other authors. A new mode, classified as a probable surface mode, was observed in the Raman spectra at similar to 480 cm(1), the appearance of which can be explained by the large defective structure and disorder in the ceria lattice. Copyright (c) 2011 John Wiley and Sons, Ltd.
T2  - Journal of Raman Spectroscopy
T1  - Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals
VL  - 43
IS  - 1
SP  - 76
EP  - 81
DO  - 10.1002/jrs.2987
ER  - 

@article{
author = "Askrabic, S. and Dohcevic-Mitrovic, Z. and Kremenović, Aleksandar S. and Lazarević, Nataša and Kahlenberg, V. and Popović, Zoran V.",
year = "2012",
abstract = "Nanocrystalline ceria (CeO2) is known for its ionic conductivity and oxygen storage properties, which depend on the presence of oxygen ion vacancies. The vacancies cause several important changes in CeO2 involving microstrain, electronic structure, magnetic properties, etc. In this article, we focus our attention to the microstructural changes of nanocrystalline CeO2-x annealed at different temperatures in the range 200500 degrees C. Structural and vibrational properties were investigated by X-ray diffraction and Raman spectroscopy. It was observed that the content of oxygen vacancies changed significantly with increasing annealing temperature, which plays an important role in the observed microstructural changes of the annealed samples. We demonstrate that the observed microstrain changes, because of variable defect content, dominate over the crystallite size effect. This finding is opposite to the conclusions made by several other authors. A new mode, classified as a probable surface mode, was observed in the Raman spectra at similar to 480 cm(1), the appearance of which can be explained by the large defective structure and disorder in the ceria lattice. Copyright (c) 2011 John Wiley and Sons, Ltd.",
journal = "Journal of Raman Spectroscopy",
title = "Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals",
volume = "43",
number = "1",
pages = "76-81",
doi = "10.1002/jrs.2987"
}

Askrabic, S., Dohcevic-Mitrovic, Z., Kremenović, A. S., Lazarević, N., Kahlenberg, V.,& Popović, Z. V.. (2012). Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals. in Journal of Raman Spectroscopy, 43(1), 76-81.
https://doi.org/10.1002/jrs.2987

Askrabic S, Dohcevic-Mitrovic Z, Kremenović AS, Lazarević N, Kahlenberg V, Popović ZV. Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals. in Journal of Raman Spectroscopy. 2012;43(1):76-81.
doi:10.1002/jrs.2987 .

Askrabic, S., Dohcevic-Mitrovic, Z., Kremenović, Aleksandar S., Lazarević, Nataša, Kahlenberg, V., Popović, Zoran V., "Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals" in Journal of Raman Spectroscopy, 43, no. 1 (2012):76-81,
https://doi.org/10.1002/jrs.2987 . .

TY  - JOUR
AU  - Kremenović, Aleksandar S.
AU  - Jančar, Boštjan
AU  - Ristić, Mira
AU  - Vučinić-Vasić, Milica
AU  - Rogan, Jelena R.
AU  - Pacevski, Aleksandar
AU  - Antić, Bratislav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4726
AB  - Transition-metal-oxide/transition-metal nanocomposites, such as NiO/Ni, FeO/Fe, and CoO/Co, have been the subject of much recent investigation (i) because of their potential applications and (ii) because they are good model systems for studies of some effects on the nanoscale. They are used, for example, as catalysts, fuel-cell electrodes, magnetic memories, etc. When a nanocomposite is composed of both ferromagnetic (FM) and antiferromagnetic (AFM) nanoparticles, interesting physical properties can occur, such as the phenomenon of exchange bias (EB). A Ni/NiO nanocomposite obtained by the thermal decomposition of nickel(II) acetate tetrahydrate, Ni(CH3COO)(2)center dot 4H(2)O, at 300 degrees C, is composed of NiO (62%) and Ni (38%) with crystallite sizes of 11 and 278 nm, respectively. We observed an increase in the crystallite size for NiO and decrease of crystallite size for Ni, a decrease in the microstrain for both and an increase in the NiO phase content with thermal annealing in air, while high-energy ball milling leads to a decrease of the crystallite size, an increase in the size of the agglomerates, and microstrain as well as reduction, NiO - GT Ni. The lattice parameters of the nanosized NiO and Ni show a deviation from the value for the bulk counterparts as a consequence of crystallite size reduction and the grain-surface relaxation effect. The exchange bias found in a milled sample with particles of 10 nm (NiO) and 11 nm (Ni) disappears for larger particles as a consequence of a coupling-area decrease between the antiferromagnetic and ferromagnetic particles. Due to reduction/oxidation (NiO LT - GT Ni) and size as well as surface-relaxation effects the saturation magnetization value increases/decreases with milling/annealing, respectively. Having in mind the effect of size on the exchange bias, coercivity, and magnetization values, it is possible, by annealing/milling, to tailor the composition and particle size and then control the exchange bias and improve the other magnetic properties of the Ni/NiO.
T2  - Journal of Physical Chemistry. C
T1  - Exchange-Bias and Grain-Surface Relaxations in Nanostructured NiO/Ni Induced by a Particle Size Reduction
VL  - 116
IS  - 7
SP  - 4356
EP  - 4364
DO  - 10.1021/jp206658v
ER  - 

@article{
author = "Kremenović, Aleksandar S. and Jančar, Boštjan and Ristić, Mira and Vučinić-Vasić, Milica and Rogan, Jelena R. and Pacevski, Aleksandar and Antić, Bratislav",
year = "2012",
abstract = "Transition-metal-oxide/transition-metal nanocomposites, such as NiO/Ni, FeO/Fe, and CoO/Co, have been the subject of much recent investigation (i) because of their potential applications and (ii) because they are good model systems for studies of some effects on the nanoscale. They are used, for example, as catalysts, fuel-cell electrodes, magnetic memories, etc. When a nanocomposite is composed of both ferromagnetic (FM) and antiferromagnetic (AFM) nanoparticles, interesting physical properties can occur, such as the phenomenon of exchange bias (EB). A Ni/NiO nanocomposite obtained by the thermal decomposition of nickel(II) acetate tetrahydrate, Ni(CH3COO)(2)center dot 4H(2)O, at 300 degrees C, is composed of NiO (62%) and Ni (38%) with crystallite sizes of 11 and 278 nm, respectively. We observed an increase in the crystallite size for NiO and decrease of crystallite size for Ni, a decrease in the microstrain for both and an increase in the NiO phase content with thermal annealing in air, while high-energy ball milling leads to a decrease of the crystallite size, an increase in the size of the agglomerates, and microstrain as well as reduction, NiO - GT Ni. The lattice parameters of the nanosized NiO and Ni show a deviation from the value for the bulk counterparts as a consequence of crystallite size reduction and the grain-surface relaxation effect. The exchange bias found in a milled sample with particles of 10 nm (NiO) and 11 nm (Ni) disappears for larger particles as a consequence of a coupling-area decrease between the antiferromagnetic and ferromagnetic particles. Due to reduction/oxidation (NiO LT - GT Ni) and size as well as surface-relaxation effects the saturation magnetization value increases/decreases with milling/annealing, respectively. Having in mind the effect of size on the exchange bias, coercivity, and magnetization values, it is possible, by annealing/milling, to tailor the composition and particle size and then control the exchange bias and improve the other magnetic properties of the Ni/NiO.",
journal = "Journal of Physical Chemistry. C",
title = "Exchange-Bias and Grain-Surface Relaxations in Nanostructured NiO/Ni Induced by a Particle Size Reduction",
volume = "116",
number = "7",
pages = "4356-4364",
doi = "10.1021/jp206658v"
}

Kremenović, A. S., Jančar, B., Ristić, M., Vučinić-Vasić, M., Rogan, J. R., Pacevski, A.,& Antić, B.. (2012). Exchange-Bias and Grain-Surface Relaxations in Nanostructured NiO/Ni Induced by a Particle Size Reduction. in Journal of Physical Chemistry. C, 116(7), 4356-4364.
https://doi.org/10.1021/jp206658v

Kremenović AS, Jančar B, Ristić M, Vučinić-Vasić M, Rogan JR, Pacevski A, Antić B. Exchange-Bias and Grain-Surface Relaxations in Nanostructured NiO/Ni Induced by a Particle Size Reduction. in Journal of Physical Chemistry. C. 2012;116(7):4356-4364.
doi:10.1021/jp206658v .

Kremenović, Aleksandar S., Jančar, Boštjan, Ristić, Mira, Vučinić-Vasić, Milica, Rogan, Jelena R., Pacevski, Aleksandar, Antić, Bratislav, "Exchange-Bias and Grain-Surface Relaxations in Nanostructured NiO/Ni Induced by a Particle Size Reduction" in Journal of Physical Chemistry. C, 116, no. 7 (2012):4356-4364,
https://doi.org/10.1021/jp206658v . .

TY  - CONF
AU  - Jović, Nataša
AU  - Antić, Bratislav
AU  - Kremenović, Aleksandar
AU  - Spasojević, Vojislav
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11035
AB  - Nanocrystalline spinel ferrites, with the general formula MFe2O4 (M is a divalent cation) are an important class of nanostructured materials with their potential in ceramic, electrochemical, magnetic, ferroelectric, catalytic and biomedical applications. Using a low temperature synthesis of such materials it is possible to obtain ultra fine particles. The crystal structure, microstructure and magnetic properties of series of nanocrystalline spinel ferrites have been studied by XRD, HRTEM, Mössbauer spectroscopy and SQUID measurements. The Rietveld analysis of the powder diffraction data have been performed (using Fullprof software) to obtain quantitative microstructural information (e.g. the cation distribution, the crystallite size, microstrain). More sophisticated models have been used to explain magnetic behavior of an assembly of nanostructured particles, which include microscopic mechanisms such as spin disorder, surface contributions and the presence of interparticle interactions (exchange and/or dipolar). The saturation magnetization of investigated nanostructural vs. bulk spinel ferrites is discussed in term of a competition between the site exchange of cations and the spin canting phenomena. For a selected example, the variation in the particle anisotropy energy, extracted from the magnetic measurements in high and low external magnetic field, is well describe accounting for the interparticle interaction and the surface effects on the energy barrier.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade
T1  - Variability of structural and magnetic properties of nanocrystalline spinel ferrites
SP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11035
ER  - 

@conference{
author = "Jović, Nataša and Antić, Bratislav and Kremenović, Aleksandar and Spasojević, Vojislav",
year = "2011",
abstract = "Nanocrystalline spinel ferrites, with the general formula MFe2O4 (M is a divalent cation) are an important class of nanostructured materials with their potential in ceramic, electrochemical, magnetic, ferroelectric, catalytic and biomedical applications. Using a low temperature synthesis of such materials it is possible to obtain ultra fine particles. The crystal structure, microstructure and magnetic properties of series of nanocrystalline spinel ferrites have been studied by XRD, HRTEM, Mössbauer spectroscopy and SQUID measurements. The Rietveld analysis of the powder diffraction data have been performed (using Fullprof software) to obtain quantitative microstructural information (e.g. the cation distribution, the crystallite size, microstrain). More sophisticated models have been used to explain magnetic behavior of an assembly of nanostructured particles, which include microscopic mechanisms such as spin disorder, surface contributions and the presence of interparticle interactions (exchange and/or dipolar). The saturation magnetization of investigated nanostructural vs. bulk spinel ferrites is discussed in term of a competition between the site exchange of cations and the spin canting phenomena. For a selected example, the variation in the particle anisotropy energy, extracted from the magnetic measurements in high and low external magnetic field, is well describe accounting for the interparticle interaction and the surface effects on the energy barrier.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade",
title = "Variability of structural and magnetic properties of nanocrystalline spinel ferrites",
pages = "40",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11035"
}

Jović, N., Antić, B., Kremenović, A.,& Spasojević, V.. (2011). Variability of structural and magnetic properties of nanocrystalline spinel ferrites. in Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade
Belgrade : Serbian Ceramic Society., 40.
https://hdl.handle.net/21.15107/rcub_vinar_11035

Jović N, Antić B, Kremenović A, Spasojević V. Variability of structural and magnetic properties of nanocrystalline spinel ferrites. in Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade. 2011;:40.
https://hdl.handle.net/21.15107/rcub_vinar_11035 .

Jović, Nataša, Antić, Bratislav, Kremenović, Aleksandar, Spasojević, Vojislav, "Variability of structural and magnetic properties of nanocrystalline spinel ferrites" in Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade (2011):40,
https://hdl.handle.net/21.15107/rcub_vinar_11035 .

TY  - CONF
AU  - Radosavljević-Mihajlović, Ana S.
AU  - Stanković, Nadežda
AU  - Pašalić, Snežana
AU  - Kremenović, Aleksandar
AU  - Dondur, Vera
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11040
AB  - The Pb-ceramic was syntheses by process of thermally induced phase transformation of Pb-exchange LTA and FAU zeolites. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 o C. Prolonged heating of the intermediate product over 1100o C results directly in formation of a disorder Pb feldsparLTA [a =8.4171(4) Å, b=13.0532(4) Å, c=7.1722(4) Å, β=115.35(3)°] and Pb-feldsparFAU [a=8.426(4) Å, b=13.0608(4) Å, c=7.1773(4) Å, β=115.36(3)°] phase. The phase conversions in the temperature range investigated were followed by thermal (DTA/TGA), XRPD, and SEM/EDS analyses. The results showed that the Pbceramic could be obtained by process of thermally induced phase transformation of Pbexchange zeolites.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade
T1  - Syntheses of Pb-ceramic from zeolite precursors: XRPD refinement and SEM/EDS analysis
SP  - 58
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11040
ER  - 

@conference{
author = "Radosavljević-Mihajlović, Ana S. and Stanković, Nadežda and Pašalić, Snežana and Kremenović, Aleksandar and Dondur, Vera",
year = "2011",
abstract = "The Pb-ceramic was syntheses by process of thermally induced phase transformation of Pb-exchange LTA and FAU zeolites. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 o C. Prolonged heating of the intermediate product over 1100o C results directly in formation of a disorder Pb feldsparLTA [a =8.4171(4) Å, b=13.0532(4) Å, c=7.1722(4) Å, β=115.35(3)°] and Pb-feldsparFAU [a=8.426(4) Å, b=13.0608(4) Å, c=7.1773(4) Å, β=115.36(3)°] phase. The phase conversions in the temperature range investigated were followed by thermal (DTA/TGA), XRPD, and SEM/EDS analyses. The results showed that the Pbceramic could be obtained by process of thermally induced phase transformation of Pbexchange zeolites.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade",
title = "Syntheses of Pb-ceramic from zeolite precursors: XRPD refinement and SEM/EDS analysis",
pages = "58",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11040"
}

Radosavljević-Mihajlović, A. S., Stanković, N., Pašalić, S., Kremenović, A.,& Dondur, V.. (2011). Syntheses of Pb-ceramic from zeolite precursors: XRPD refinement and SEM/EDS analysis. in Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade
Belgrade : Serbian Ceramic Society., 58.
https://hdl.handle.net/21.15107/rcub_vinar_11040

Radosavljević-Mihajlović AS, Stanković N, Pašalić S, Kremenović A, Dondur V. Syntheses of Pb-ceramic from zeolite precursors: XRPD refinement and SEM/EDS analysis. in Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade. 2011;:58.
https://hdl.handle.net/21.15107/rcub_vinar_11040 .

Radosavljević-Mihajlović, Ana S., Stanković, Nadežda, Pašalić, Snežana, Kremenović, Aleksandar, Dondur, Vera, "Syntheses of Pb-ceramic from zeolite precursors: XRPD refinement and SEM/EDS analysis" in Advanced Ceramics and Application : 1st Serbian Ceramic Society Conference :  program and the book of abstracts; March 17-18; Belgrade (2011):58,
https://hdl.handle.net/21.15107/rcub_vinar_11040 .