TY  - JOUR
AU  - Veselinović, Ljiljana
AU  - Mitrić, Miodrag
AU  - Mančić, Lidija
AU  - Jardim, Paula M.
AU  - Škapin, Srečo Davor
AU  - Cvjetićanin, Nikola
AU  - Milović, Miloš D.
AU  - Marković, Smilja
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12382
AB  - This paper reports a detailed study of crystal structure and dielectric properties of ruthenium-substituted calcium-copper titanates (CaCu3Ti4−xRuxO12, CCTRO). A series of three samples with different stoichiometry was prepared: CaCu3Ti4−xRuxO12, x = 0, 1 and 4, abbreviated as CCTO, CCT3RO and CCRO, respectively. A detailed structural analysis of CCTRO samples was done by the Rietveld refinement of XRPD data. The results show that, regardless of whether Ti4+ or Ru4+ ions are placed in B crystallographic position in AA’3B4O12 (CaCu3Ti4−xRuxO12) unit cell, the crystal structure remains cubic with Im3¯ symmetry. Slight increases in the unit cell parameters, cell volume and interatomic distances indicate that Ru4+ ions with larger ionic radii (0.62 Å) than Ti4+ (0.605 Å) are incorporated in the CaCu3Ti4−xRuxO12 crystal lattice. The structural investigations were confirmed using TEM, HRTEM and ADF/STEM analyses, including EDXS elemental mapping. The effect of Ru atoms share in CaCu3Ti4−xRuxO12 samples on their electrical properties was determined by impedance and dielectric measurements. Results of dielectric measurements indicate that one atom of ruthenium per CaCu3Ti4−xRuxO12 unit cell transforms dielectric CCTO into conductive CCT3RO while preserving cubic crystal structure. Our findings about CCTO and CCT3RO ceramics promote them as ideal tandem to overcome the problem of stress on dielectric-electrode interfaces in capacitors.
T2  - Materials
T1  - Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate
VL  - 15
IS  - 23
SP  - 8500
SP  - 8500
DO  - 10.3390/ma15238500
ER  - 

@article{
author = "Veselinović, Ljiljana and Mitrić, Miodrag and Mančić, Lidija and Jardim, Paula M. and Škapin, Srečo Davor and Cvjetićanin, Nikola and Milović, Miloš D. and Marković, Smilja",
year = "2022",
abstract = "This paper reports a detailed study of crystal structure and dielectric properties of ruthenium-substituted calcium-copper titanates (CaCu3Ti4−xRuxO12, CCTRO). A series of three samples with different stoichiometry was prepared: CaCu3Ti4−xRuxO12, x = 0, 1 and 4, abbreviated as CCTO, CCT3RO and CCRO, respectively. A detailed structural analysis of CCTRO samples was done by the Rietveld refinement of XRPD data. The results show that, regardless of whether Ti4+ or Ru4+ ions are placed in B crystallographic position in AA’3B4O12 (CaCu3Ti4−xRuxO12) unit cell, the crystal structure remains cubic with Im3¯ symmetry. Slight increases in the unit cell parameters, cell volume and interatomic distances indicate that Ru4+ ions with larger ionic radii (0.62 Å) than Ti4+ (0.605 Å) are incorporated in the CaCu3Ti4−xRuxO12 crystal lattice. The structural investigations were confirmed using TEM, HRTEM and ADF/STEM analyses, including EDXS elemental mapping. The effect of Ru atoms share in CaCu3Ti4−xRuxO12 samples on their electrical properties was determined by impedance and dielectric measurements. Results of dielectric measurements indicate that one atom of ruthenium per CaCu3Ti4−xRuxO12 unit cell transforms dielectric CCTO into conductive CCT3RO while preserving cubic crystal structure. Our findings about CCTO and CCT3RO ceramics promote them as ideal tandem to overcome the problem of stress on dielectric-electrode interfaces in capacitors.",
journal = "Materials",
title = "Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate",
volume = "15",
number = "23",
pages = "8500-8500",
doi = "10.3390/ma15238500"
}

Veselinović, L., Mitrić, M., Mančić, L., Jardim, P. M., Škapin, S. D., Cvjetićanin, N., Milović, M. D.,& Marković, S.. (2022). Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate. in Materials, 15(23), 8500.
https://doi.org/10.3390/ma15238500

Veselinović L, Mitrić M, Mančić L, Jardim PM, Škapin SD, Cvjetićanin N, Milović MD, Marković S. Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate. in Materials. 2022;15(23):8500.
doi:10.3390/ma15238500 .

Veselinović, Ljiljana, Mitrić, Miodrag, Mančić, Lidija, Jardim, Paula M., Škapin, Srečo Davor, Cvjetićanin, Nikola, Milović, Miloš D., Marković, Smilja, "Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate" in Materials, 15, no. 23 (2022):8500,
https://doi.org/10.3390/ma15238500 . .

TY  - CONF
AU  - Mašojević, Dijana
AU  - Stamenović, Una
AU  - Vodnik, Vesna
AU  - Barudžija, Tanja
AU  - Škapin, Srečo
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12486
AB  - Nanocomposite materials based on conductive polymers and metal nanoparticles made an appearance as a new class of hybrid materials with considerable potential for application in different fields, from medical and food/wastewater treatments to catalysis and sensors. Besides their low cost and ease of preparation, their optical and mechanical characteristics are tunable, while individual features of each component become more obvious, and new ones appear. In this group of materials, newly, chemically synthesized Cobalt@Polypyrrole (Co@PPy) and Cobalt/Gold@Polypyrrole (Co/Au@PPy) nanocomposites could be classified. With low electrode potential, Co nanoparticles (CoNPs) are unstable, prone to oxidation and agglomeration. For this reason, both nanocomposites were synthesized under argon. Firstly, CoNPs were synthesized in water, by simple reduction of Co2+ by sodium borohydride and in the presence of sodium dodecyl sulfate as a surfactant that will stabilize formed Co nuclei and affect their further growth. After adding pyrrole monomer, the polymerization reaction was initiated by ammonium peroxydisulfate and Au3+ for Co@PPy and Co/Au@PPy, respectively. Together with pyrrole monomer oxidation to final polymer structure by Au3+, these ions are reduced by nitrogen atoms from secondary amino groups in pyrrole units, forming AuNPs incorporated throughout polymer matrix. Conductive form of both nanocomposites, i.e., the presence of bipolarons, was confirmed by UV-Vis and FTIR analysis, while FESEM showed granular morphologies. With both nanocomposites having satisfactory percentage of metals incorporated, it could be expected that such materials could find their place in the field of catalysis, direct borohydride fuel cell, or wastewater treatment, where heavy, toxic metals such As(III) is, represent a great danger for the environment.
PB  - Belgrade : Materials Research Society of Serbia – MRS-Serbia
C3  - YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts
T1  - Nanostructured Cobalt@Polypyrrole and Cobalt/Gold@Polypyrrole materials: synthesis, optical and structural properties
SP  - 135
EP  - 135
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12486
ER  - 

@conference{
author = "Mašojević, Dijana and Stamenović, Una and Vodnik, Vesna and Barudžija, Tanja and Škapin, Srečo",
year = "2021",
abstract = "Nanocomposite materials based on conductive polymers and metal nanoparticles made an appearance as a new class of hybrid materials with considerable potential for application in different fields, from medical and food/wastewater treatments to catalysis and sensors. Besides their low cost and ease of preparation, their optical and mechanical characteristics are tunable, while individual features of each component become more obvious, and new ones appear. In this group of materials, newly, chemically synthesized Cobalt@Polypyrrole (Co@PPy) and Cobalt/Gold@Polypyrrole (Co/Au@PPy) nanocomposites could be classified. With low electrode potential, Co nanoparticles (CoNPs) are unstable, prone to oxidation and agglomeration. For this reason, both nanocomposites were synthesized under argon. Firstly, CoNPs were synthesized in water, by simple reduction of Co2+ by sodium borohydride and in the presence of sodium dodecyl sulfate as a surfactant that will stabilize formed Co nuclei and affect their further growth. After adding pyrrole monomer, the polymerization reaction was initiated by ammonium peroxydisulfate and Au3+ for Co@PPy and Co/Au@PPy, respectively. Together with pyrrole monomer oxidation to final polymer structure by Au3+, these ions are reduced by nitrogen atoms from secondary amino groups in pyrrole units, forming AuNPs incorporated throughout polymer matrix. Conductive form of both nanocomposites, i.e., the presence of bipolarons, was confirmed by UV-Vis and FTIR analysis, while FESEM showed granular morphologies. With both nanocomposites having satisfactory percentage of metals incorporated, it could be expected that such materials could find their place in the field of catalysis, direct borohydride fuel cell, or wastewater treatment, where heavy, toxic metals such As(III) is, represent a great danger for the environment.",
publisher = "Belgrade : Materials Research Society of Serbia – MRS-Serbia",
journal = "YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts",
title = "Nanostructured Cobalt@Polypyrrole and Cobalt/Gold@Polypyrrole materials: synthesis, optical and structural properties",
pages = "135-135",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12486"
}

Mašojević, D., Stamenović, U., Vodnik, V., Barudžija, T.,& Škapin, S.. (2021). Nanostructured Cobalt@Polypyrrole and Cobalt/Gold@Polypyrrole materials: synthesis, optical and structural properties. in YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts
Belgrade : Materials Research Society of Serbia – MRS-Serbia., 135-135.
https://hdl.handle.net/21.15107/rcub_vinar_12486

Mašojević D, Stamenović U, Vodnik V, Barudžija T, Škapin S. Nanostructured Cobalt@Polypyrrole and Cobalt/Gold@Polypyrrole materials: synthesis, optical and structural properties. in YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts. 2021;:135-135.
https://hdl.handle.net/21.15107/rcub_vinar_12486 .

Mašojević, Dijana, Stamenović, Una, Vodnik, Vesna, Barudžija, Tanja, Škapin, Srečo, "Nanostructured Cobalt@Polypyrrole and Cobalt/Gold@Polypyrrole materials: synthesis, optical and structural properties" in YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts (2021):135-135,
https://hdl.handle.net/21.15107/rcub_vinar_12486 .

TY  - CONF
AU  - Jevtić, Marija
AU  - Radulović, Aleksandra
AU  - Mitrić, Miodrag
AU  - Ignjatović, Nenad
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11963
AB  - Poli(laktid-ko-glikolid)/hidroksiapatit je bioaktivni, biodegradabilni kompozit dizajniran za potrebe rekonstrukcije i reparacije koštanog tkiva. Aplikativnost ovog materijala je usko vezana za brojne njegove osobine među kojima su veličina, oblik i struktura sintetisanih čestica. DLPLG/HAp je sintetisan primenom ultrazvučne metode i cilj ovog rada je predstavljanje analize uticaja različitih eksperimentalnih parametara, kao što su sintetska temperatura, sastav kompozita, izbor stabilizatora i sl., na veličinu i oblik sintetisanih čestica i p
PB  - Beograd : Institut tehničkih nauka SANU
C3  - Šesta konferencija mladih istraživača Nauka i inženjerstvo novih materijala : Program i knjiga apstrakata; Decembar 24–26, Beograd
T1  - Uticaj sintetskih parametara na morfologiju ultrazvučno sintetisanog DLPLG/HAp biokompozita
SP  - 1
EP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11963
ER  - 

@conference{
author = "Jevtić, Marija and Radulović, Aleksandra and Mitrić, Miodrag and Ignjatović, Nenad and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2007",
abstract = "Poli(laktid-ko-glikolid)/hidroksiapatit je bioaktivni, biodegradabilni kompozit dizajniran za potrebe rekonstrukcije i reparacije koštanog tkiva. Aplikativnost ovog materijala je usko vezana za brojne njegove osobine među kojima su veličina, oblik i struktura sintetisanih čestica. DLPLG/HAp je sintetisan primenom ultrazvučne metode i cilj ovog rada je predstavljanje analize uticaja različitih eksperimentalnih parametara, kao što su sintetska temperatura, sastav kompozita, izbor stabilizatora i sl., na veličinu i oblik sintetisanih čestica i p",
publisher = "Beograd : Institut tehničkih nauka SANU",
journal = "Šesta konferencija mladih istraživača Nauka i inženjerstvo novih materijala : Program i knjiga apstrakata; Decembar 24–26, Beograd",
title = "Uticaj sintetskih parametara na morfologiju ultrazvučno sintetisanog DLPLG/HAp biokompozita",
pages = "1-1",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11963"
}

Jevtić, M., Radulović, A., Mitrić, M., Ignjatović, N., Škapin, S. D.,& Uskoković, D.. (2007). Uticaj sintetskih parametara na morfologiju ultrazvučno sintetisanog DLPLG/HAp biokompozita. in Šesta konferencija mladih istraživača Nauka i inženjerstvo novih materijala : Program i knjiga apstrakata; Decembar 24–26, Beograd
Beograd : Institut tehničkih nauka SANU., 1-1.
https://hdl.handle.net/21.15107/rcub_vinar_11963

Jevtić M, Radulović A, Mitrić M, Ignjatović N, Škapin SD, Uskoković D. Uticaj sintetskih parametara na morfologiju ultrazvučno sintetisanog DLPLG/HAp biokompozita. in Šesta konferencija mladih istraživača Nauka i inženjerstvo novih materijala : Program i knjiga apstrakata; Decembar 24–26, Beograd. 2007;:1-1.
https://hdl.handle.net/21.15107/rcub_vinar_11963 .

Jevtić, Marija, Radulović, Aleksandra, Mitrić, Miodrag, Ignjatović, Nenad, Škapin, Srečo Davor, Uskoković, Dragan, "Uticaj sintetskih parametara na morfologiju ultrazvučno sintetisanog DLPLG/HAp biokompozita" in Šesta konferencija mladih istraživača Nauka i inženjerstvo novih materijala : Program i knjiga apstrakata; Decembar 24–26, Beograd (2007):1-1,
https://hdl.handle.net/21.15107/rcub_vinar_11963 .