TY  - JOUR
AU  - Nikolić, Aleksandar S.
AU  - Jovic, N.
AU  - Rogan, J.
AU  - Kremenović, Aleksandar
AU  - Ristic, M.
AU  - Meden, A.
AU  - Antić, Bratislav
PY  - 2013
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1363
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.
PB  - Elsevier Sci Ltd, Oxford
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 Jovic, N. and Rogan, J. and Kremenović, Aleksandar and Ristic, M. 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.",
publisher = "Elsevier Sci Ltd, Oxford",
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., Jovic, N., Rogan, J., Kremenović, A., Ristic, M., Meden, A.,& Antić, B.. (2013). Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites. in Ceramics International
Elsevier Sci Ltd, Oxford., 39(6), 6681-6688.
https://doi.org/10.1016/j.ceramint.2013.01.106

Nikolić AS, Jovic N, Rogan J, Kremenović A, Ristic 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., Jovic, N., Rogan, J., Kremenović, Aleksandar, Ristic, M., 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  - Antić, Bratislav
AU  - Kremenović, Aleksandar
AU  - Vučinić-Vasić, M.
AU  - Dohcevic-Mitrovic, Z.
AU  - Nikolić, Aleksandar S.
AU  - Gruden-Pavlović, Maja
AU  - Jancar, B.
AU  - Meden, A.
PY  - 2010
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1085
AB  - After controlled thermal degradation of acetylacetonato (AA) complexes, mixtures of monodisperse similar to 5 nm large isometric particles of Y2-xYbxO3 (x = 0.06, 0.10, 0.20, 0.40) were synthesized. Detailed information on nanoparticles' microstructure and core crystal structure is reported. The Yb3+ ions occupy preferently C-3i sites for low Yb3+ concentrations, while for 20 at.% Yb3+, a random distribution was found. It was shown that the particle/crystallite size and strain as well as Raman modes positions and widths are influenced by Yb3+ concentration. Crystallographic and Raman spectroscopy results indicate that the particles are core/shell structured with cubic crystalline core and monoclinic-like disordered shell. Most probable particle's shell/core volume ratio decreased with annealing at 500 degrees C and the shell disappeared when annealed at 1000 degrees C. (C) 2010 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Composition related properties of (Yb,Y)(2)O-3 nanoparticles synthesized by controlled thermal degradation of AA complexes
VL  - 122
IS  - 2-3
SP  - 386
EP  - 391
DO  - 10.1016/j.matchemphys.2010.03.010
ER  - 

@article{
author = "Antić, Bratislav and Kremenović, Aleksandar and Vučinić-Vasić, M. and Dohcevic-Mitrovic, Z. and Nikolić, Aleksandar S. and Gruden-Pavlović, Maja and Jancar, B. and Meden, A.",
year = "2010",
abstract = "After controlled thermal degradation of acetylacetonato (AA) complexes, mixtures of monodisperse similar to 5 nm large isometric particles of Y2-xYbxO3 (x = 0.06, 0.10, 0.20, 0.40) were synthesized. Detailed information on nanoparticles' microstructure and core crystal structure is reported. The Yb3+ ions occupy preferently C-3i sites for low Yb3+ concentrations, while for 20 at.% Yb3+, a random distribution was found. It was shown that the particle/crystallite size and strain as well as Raman modes positions and widths are influenced by Yb3+ concentration. Crystallographic and Raman spectroscopy results indicate that the particles are core/shell structured with cubic crystalline core and monoclinic-like disordered shell. Most probable particle's shell/core volume ratio decreased with annealing at 500 degrees C and the shell disappeared when annealed at 1000 degrees C. (C) 2010 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Composition related properties of (Yb,Y)(2)O-3 nanoparticles synthesized by controlled thermal degradation of AA complexes",
volume = "122",
number = "2-3",
pages = "386-391",
doi = "10.1016/j.matchemphys.2010.03.010"
}

Antić, B., Kremenović, A., Vučinić-Vasić, M., Dohcevic-Mitrovic, Z., Nikolić, A. S., Gruden-Pavlović, M., Jancar, B.,& Meden, A.. (2010). Composition related properties of (Yb,Y)(2)O-3 nanoparticles synthesized by controlled thermal degradation of AA complexes. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 122(2-3), 386-391.
https://doi.org/10.1016/j.matchemphys.2010.03.010

Antić B, Kremenović A, Vučinić-Vasić M, Dohcevic-Mitrovic Z, Nikolić AS, Gruden-Pavlović M, Jancar B, Meden A. Composition related properties of (Yb,Y)(2)O-3 nanoparticles synthesized by controlled thermal degradation of AA complexes. in Materials Chemistry and Physics. 2010;122(2-3):386-391.
doi:10.1016/j.matchemphys.2010.03.010 .

Antić, Bratislav, Kremenović, Aleksandar, Vučinić-Vasić, M., Dohcevic-Mitrovic, Z., Nikolić, Aleksandar S., Gruden-Pavlović, Maja, Jancar, B., Meden, A., "Composition related properties of (Yb,Y)(2)O-3 nanoparticles synthesized by controlled thermal degradation of AA complexes" in Materials Chemistry and Physics, 122, no. 2-3 (2010):386-391,
https://doi.org/10.1016/j.matchemphys.2010.03.010 . .

TY  - JOUR
AU  - Kremenović, Aleksandar
AU  - Antić, Bratislav
AU  - Nikolić, Aleksandar S.
AU  - Blanusa, J.
AU  - Jancar, B.
AU  - Meden, A.
AU  - Mentus, Slavko V.
PY  - 2007
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/887
AB  - A novel synthesis route based on thermal decomposition of yttrium and gadolinium complexes with 2,4-pentanedione ligand has been used to synthesize 5 nn size (Y0.9Gd0.1)(2)O-3 powder. Refinement of occupancy parameters revealed that Gd3+ ions preferably occupy C-3i sites in host Y2O3, forming a material with a metastable cation distribution. The average crystallite size was found to increase, and the average microstrain to decrease, as the annealing temperature is increased, while the Gd3+ ion distribution remained metastable in nature. Small anisotropic X-ray powder diffraction pattern line broadening due to crystallite size effects was observed. The inverse susceptibility of the 5 nn sample exhibits unusual break in slope to a smaller value below 2.7 K. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Scripta Materialia
T1  - The dependence of cation distribution, microstrain and magnetic susceptibility on particle size in nanocrystalline Gd2O3/Y2O3
VL  - 57
IS  - 12
SP  - 1061
EP  - 1064
DO  - 10.1016/j.scriptamat.2007.09.002
ER  - 

@article{
author = "Kremenović, Aleksandar and Antić, Bratislav and Nikolić, Aleksandar S. and Blanusa, J. and Jancar, B. and Meden, A. and Mentus, Slavko V.",
year = "2007",
abstract = "A novel synthesis route based on thermal decomposition of yttrium and gadolinium complexes with 2,4-pentanedione ligand has been used to synthesize 5 nn size (Y0.9Gd0.1)(2)O-3 powder. Refinement of occupancy parameters revealed that Gd3+ ions preferably occupy C-3i sites in host Y2O3, forming a material with a metastable cation distribution. The average crystallite size was found to increase, and the average microstrain to decrease, as the annealing temperature is increased, while the Gd3+ ion distribution remained metastable in nature. Small anisotropic X-ray powder diffraction pattern line broadening due to crystallite size effects was observed. The inverse susceptibility of the 5 nn sample exhibits unusual break in slope to a smaller value below 2.7 K. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Scripta Materialia",
title = "The dependence of cation distribution, microstrain and magnetic susceptibility on particle size in nanocrystalline Gd2O3/Y2O3",
volume = "57",
number = "12",
pages = "1061-1064",
doi = "10.1016/j.scriptamat.2007.09.002"
}

Kremenović, A., Antić, B., Nikolić, A. S., Blanusa, J., Jancar, B., Meden, A.,& Mentus, S. V.. (2007). The dependence of cation distribution, microstrain and magnetic susceptibility on particle size in nanocrystalline Gd2O3/Y2O3. in Scripta Materialia
Pergamon-Elsevier Science Ltd, Oxford., 57(12), 1061-1064.
https://doi.org/10.1016/j.scriptamat.2007.09.002

Kremenović A, Antić B, Nikolić AS, Blanusa J, Jancar B, Meden A, Mentus SV. The dependence of cation distribution, microstrain and magnetic susceptibility on particle size in nanocrystalline Gd2O3/Y2O3. in Scripta Materialia. 2007;57(12):1061-1064.
doi:10.1016/j.scriptamat.2007.09.002 .

Kremenović, Aleksandar, Antić, Bratislav, Nikolić, Aleksandar S., Blanusa, J., Jancar, B., Meden, A., Mentus, Slavko V., "The dependence of cation distribution, microstrain and magnetic susceptibility on particle size in nanocrystalline Gd2O3/Y2O3" in Scripta Materialia, 57, no. 12 (2007):1061-1064,
https://doi.org/10.1016/j.scriptamat.2007.09.002 . .