TY  - JOUR
AU  - Antić, Bratislav
AU  - Rogan, Jelena R.
AU  - Kremenović, Aleksandar S.
AU  - Nikolić, Aleksandar S.
AU  - Vučinić-Vasić, Milica
AU  - Božanić, Dušan K.
AU  - Goya, Gerardo F.
AU  - Colomban, Ph
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4008
AB  - Spherical shaped nanoparticles of series Y2-xEuxO3 (x = 0.06, 0.10, 0.20, and 2) and Gd2-xEuxO3 (x = 0.06, 0.10) were prepared by thermolysis of 2,4-pentanedione complexes of Y, Gd, and Eu. The bixbyite phase of Gd2-xEuxO3 samples was formed at 500 degrees C, whereas the thermal decomposition of Y and Eu complexes mixtures occurred at higher temperatures. Linearity in the concentration dependence on lattice parameter confirmed the formation of solid solutions. The distribution of Eu3+ in Gd2-xEuxO3 was changed with thermal annealing: in the as-prepared sample (x = 0.10) the distribution was preferential at C-3i sites while in the annealed samples, Eu3+ were distributed at both C-2 and C-3i sites. Rietveld refinement of site occupancies as well as emission spectra showed a random distribution of cations in Y2-xEuxO3. The photoluminescence (PL) measurements of the sample showed red emission with the main peak at 614 nm (D-5(0)-F-7(2)). The PL intensity increased with increasing concentration of Eu3+ in both series. Infrared excitation was required to obtain good Raman spectra. The linear dependence of the main Raman peak wavenumber offers a non-destructive method for monitoring the substitution level and its homogeneity at the micron scale.
T2  - Nanotechnology
T1  - Optimization of photoluminescence of Y2O3:Eu and Gd2O3:Eu phosphors synthesized by thermolysis of 2,4-pentanedione complexes
VL  - 21
IS  - 24
DO  - 10.1088/0957-4484/21/24/245702
ER  - 

@article{
author = "Antić, Bratislav and Rogan, Jelena R. and Kremenović, Aleksandar S. and Nikolić, Aleksandar S. and Vučinić-Vasić, Milica and Božanić, Dušan K. and Goya, Gerardo F. and Colomban, Ph",
year = "2010",
abstract = "Spherical shaped nanoparticles of series Y2-xEuxO3 (x = 0.06, 0.10, 0.20, and 2) and Gd2-xEuxO3 (x = 0.06, 0.10) were prepared by thermolysis of 2,4-pentanedione complexes of Y, Gd, and Eu. The bixbyite phase of Gd2-xEuxO3 samples was formed at 500 degrees C, whereas the thermal decomposition of Y and Eu complexes mixtures occurred at higher temperatures. Linearity in the concentration dependence on lattice parameter confirmed the formation of solid solutions. The distribution of Eu3+ in Gd2-xEuxO3 was changed with thermal annealing: in the as-prepared sample (x = 0.10) the distribution was preferential at C-3i sites while in the annealed samples, Eu3+ were distributed at both C-2 and C-3i sites. Rietveld refinement of site occupancies as well as emission spectra showed a random distribution of cations in Y2-xEuxO3. The photoluminescence (PL) measurements of the sample showed red emission with the main peak at 614 nm (D-5(0)-F-7(2)). The PL intensity increased with increasing concentration of Eu3+ in both series. Infrared excitation was required to obtain good Raman spectra. The linear dependence of the main Raman peak wavenumber offers a non-destructive method for monitoring the substitution level and its homogeneity at the micron scale.",
journal = "Nanotechnology",
title = "Optimization of photoluminescence of Y2O3:Eu and Gd2O3:Eu phosphors synthesized by thermolysis of 2,4-pentanedione complexes",
volume = "21",
number = "24",
doi = "10.1088/0957-4484/21/24/245702"
}

Antić, B., Rogan, J. R., Kremenović, A. S., Nikolić, A. S., Vučinić-Vasić, M., Božanić, D. K., Goya, G. F.,& Colomban, P.. (2010). Optimization of photoluminescence of Y2O3:Eu and Gd2O3:Eu phosphors synthesized by thermolysis of 2,4-pentanedione complexes. in Nanotechnology, 21(24).
https://doi.org/10.1088/0957-4484/21/24/245702

Antić B, Rogan JR, Kremenović AS, Nikolić AS, Vučinić-Vasić M, Božanić DK, Goya GF, Colomban P. Optimization of photoluminescence of Y2O3:Eu and Gd2O3:Eu phosphors synthesized by thermolysis of 2,4-pentanedione complexes. in Nanotechnology. 2010;21(24).
doi:10.1088/0957-4484/21/24/245702 .

Antić, Bratislav, Rogan, Jelena R., Kremenović, Aleksandar S., Nikolić, Aleksandar S., Vučinić-Vasić, Milica, Božanić, Dušan K., Goya, Gerardo F., Colomban, Ph, "Optimization of photoluminescence of Y2O3:Eu and Gd2O3:Eu phosphors synthesized by thermolysis of 2,4-pentanedione complexes" in Nanotechnology, 21, no. 24 (2010),
https://doi.org/10.1088/0957-4484/21/24/245702 . .

TY  - JOUR
AU  - Kremenović, Aleksandar S.
AU  - Blanuša, Jovan
AU  - Antić, Bratislav
AU  - Colomban, Ph
AU  - Kahlenberg, V.
AU  - Jovalekić, Čedomir
AU  - Dukić, Jelena
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3176
AB  - A Y2O3: Yb nanoscale magnet that belongs to the cubic C-type or bixbyite structure family was synthesized by high energy ball milling ( HEBM). An as-prepared sample ( S1) was annealed at 650 degrees C ( S2) and 950 degrees C ( S3). Cation populations were determined by the refinement of site occupancies. It was found that in S1 and S2 Yb3+ ions occupy exclusively the 8b ( or C-3i) position, whereas in S3 a small amount of Yb3+ is also located on Wyckoff-site 24d ( or C-2). X-ray powder diffraction line broadening analysis was done by using the Rietveld method using regular TCH-pV functions ( isotropic effects) and symmetrized cubic harmonics ( anisotropic effects) for the refinement. The line broadening anisotropy decreases due to strain effects from S1 to S3, while the crystallite size anisotropy increases from S1 to S3. Transmission electron microscopy ( TEM) and Raman spectroscopy were used to define the homogeneity, microstructure and to locally probe the structure of the samples S1-S3. Magnetic susceptibility results in the 2-300 K temperature regions were analysed by applying the first-order perturbation theory. The mean energy gap between ground and excited crystal field levels ( E-i), and their effective magnetic numbers M-ieff, were determined. The analysis of the paramagnetic temperature shows the absence of clusterization of the magnetic ions.
T2  - Nanotechnology
T1  - A Y2O3 : Yb nanoscale magnet obtained by HEBM: C-3i/C-2 site occupancies, size/strain analysis and crystal field levels of Yb3+ ions
VL  - 18
IS  - 14
DO  - 10.1088/0957-4484/18/14/145616
ER  - 

@article{
author = "Kremenović, Aleksandar S. and Blanuša, Jovan and Antić, Bratislav and Colomban, Ph and Kahlenberg, V. and Jovalekić, Čedomir and Dukić, Jelena",
year = "2007",
abstract = "A Y2O3: Yb nanoscale magnet that belongs to the cubic C-type or bixbyite structure family was synthesized by high energy ball milling ( HEBM). An as-prepared sample ( S1) was annealed at 650 degrees C ( S2) and 950 degrees C ( S3). Cation populations were determined by the refinement of site occupancies. It was found that in S1 and S2 Yb3+ ions occupy exclusively the 8b ( or C-3i) position, whereas in S3 a small amount of Yb3+ is also located on Wyckoff-site 24d ( or C-2). X-ray powder diffraction line broadening analysis was done by using the Rietveld method using regular TCH-pV functions ( isotropic effects) and symmetrized cubic harmonics ( anisotropic effects) for the refinement. The line broadening anisotropy decreases due to strain effects from S1 to S3, while the crystallite size anisotropy increases from S1 to S3. Transmission electron microscopy ( TEM) and Raman spectroscopy were used to define the homogeneity, microstructure and to locally probe the structure of the samples S1-S3. Magnetic susceptibility results in the 2-300 K temperature regions were analysed by applying the first-order perturbation theory. The mean energy gap between ground and excited crystal field levels ( E-i), and their effective magnetic numbers M-ieff, were determined. The analysis of the paramagnetic temperature shows the absence of clusterization of the magnetic ions.",
journal = "Nanotechnology",
title = "A Y2O3 : Yb nanoscale magnet obtained by HEBM: C-3i/C-2 site occupancies, size/strain analysis and crystal field levels of Yb3+ ions",
volume = "18",
number = "14",
doi = "10.1088/0957-4484/18/14/145616"
}

Kremenović, A. S., Blanuša, J., Antić, B., Colomban, P., Kahlenberg, V., Jovalekić, Č.,& Dukić, J.. (2007). A Y2O3 : Yb nanoscale magnet obtained by HEBM: C-3i/C-2 site occupancies, size/strain analysis and crystal field levels of Yb3+ ions. in Nanotechnology, 18(14).
https://doi.org/10.1088/0957-4484/18/14/145616

Kremenović AS, Blanuša J, Antić B, Colomban P, Kahlenberg V, Jovalekić Č, Dukić J. A Y2O3 : Yb nanoscale magnet obtained by HEBM: C-3i/C-2 site occupancies, size/strain analysis and crystal field levels of Yb3+ ions. in Nanotechnology. 2007;18(14).
doi:10.1088/0957-4484/18/14/145616 .

Kremenović, Aleksandar S., Blanuša, Jovan, Antić, Bratislav, Colomban, Ph, Kahlenberg, V., Jovalekić, Čedomir, Dukić, Jelena, "A Y2O3 : Yb nanoscale magnet obtained by HEBM: C-3i/C-2 site occupancies, size/strain analysis and crystal field levels of Yb3+ ions" in Nanotechnology, 18, no. 14 (2007),
https://doi.org/10.1088/0957-4484/18/14/145616 . .

TY  - JOUR
AU  - Vučinić-Vasić, Milica
AU  - Antić, Bratislav
AU  - Kremenović, Aleksandar S.
AU  - Nikoliv, A. S.
AU  - Stoiljković, Milovan
AU  - Bibić, Nataša M.
AU  - Spasojević, Vojislav
AU  - Colomban, Ph
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3112
AB  - The results on the synthesis, microstructure, structure and DC magnetization studies of nanocomposite Zn, Ni ferrite/NiO powder obtained by thermal decomposition of acetylacetonato complexes are reported in this paper. According to the results obtained by inductively coupled plasma optical emission spectroscopy (ICP-OES) element analysis and multiphase Rietveld refinement, the three samples made are composed of spinel-ferrite (86.7%-96.7%) and NiO (3.3%-13.3%) phases. The compositions of the spinel-ferrite (SP) phase in the investigated samples, S1-S3, are Zn0.72Ni0.24Fe1.98O4, Zn0.56Ni0.29Fe2.07O4 and Zn0.40Ni0.40Fe2.10O4, respectively. Due to the cation deficiency in spinels, created vacancies induce a partial change in the cation valence, Ni2+ - GT Ni3+. The vacancy distribution is found to be random at 8a and 16d cation sites, except in sample S3, where all vacancies are over octahedral sites. The x-ray line broadening due to crystallite size effect is found to be isotropic for all spinels, while the x-ray line broadening due to the strain effect is anisotropic. A correlation between the Zn2+ occupancy of the tetrahedral site and the 650 cm(-1) Raman peak intensities is shown. The observed coercivity decrease and shift in hysteresis loop in the samples are caused by the interaction between spinel and NiO phase. The results of M(H) measurements point to the properties of an ensemble of interacting nanoparticles. High saturation magnetization values and superparamagnetic behaviour at room temperature point to the technological significance of the title compounds.
T2  - Nanotechnology
T1  - Zn,Ni ferrite/NiO nanocomposite powder obtained from acetylacetonato complexes
VL  - 17
IS  - 19
SP  - 4877
EP  - 4884
DO  - 10.1088/0957-4484/17/19/017
ER  - 

@article{
author = "Vučinić-Vasić, Milica and Antić, Bratislav and Kremenović, Aleksandar S. and Nikoliv, A. S. and Stoiljković, Milovan and Bibić, Nataša M. and Spasojević, Vojislav and Colomban, Ph",
year = "2006",
abstract = "The results on the synthesis, microstructure, structure and DC magnetization studies of nanocomposite Zn, Ni ferrite/NiO powder obtained by thermal decomposition of acetylacetonato complexes are reported in this paper. According to the results obtained by inductively coupled plasma optical emission spectroscopy (ICP-OES) element analysis and multiphase Rietveld refinement, the three samples made are composed of spinel-ferrite (86.7%-96.7%) and NiO (3.3%-13.3%) phases. The compositions of the spinel-ferrite (SP) phase in the investigated samples, S1-S3, are Zn0.72Ni0.24Fe1.98O4, Zn0.56Ni0.29Fe2.07O4 and Zn0.40Ni0.40Fe2.10O4, respectively. Due to the cation deficiency in spinels, created vacancies induce a partial change in the cation valence, Ni2+ - GT Ni3+. The vacancy distribution is found to be random at 8a and 16d cation sites, except in sample S3, where all vacancies are over octahedral sites. The x-ray line broadening due to crystallite size effect is found to be isotropic for all spinels, while the x-ray line broadening due to the strain effect is anisotropic. A correlation between the Zn2+ occupancy of the tetrahedral site and the 650 cm(-1) Raman peak intensities is shown. The observed coercivity decrease and shift in hysteresis loop in the samples are caused by the interaction between spinel and NiO phase. The results of M(H) measurements point to the properties of an ensemble of interacting nanoparticles. High saturation magnetization values and superparamagnetic behaviour at room temperature point to the technological significance of the title compounds.",
journal = "Nanotechnology",
title = "Zn,Ni ferrite/NiO nanocomposite powder obtained from acetylacetonato complexes",
volume = "17",
number = "19",
pages = "4877-4884",
doi = "10.1088/0957-4484/17/19/017"
}

Vučinić-Vasić, M., Antić, B., Kremenović, A. S., Nikoliv, A. S., Stoiljković, M., Bibić, N. M., Spasojević, V.,& Colomban, P.. (2006). Zn,Ni ferrite/NiO nanocomposite powder obtained from acetylacetonato complexes. in Nanotechnology, 17(19), 4877-4884.
https://doi.org/10.1088/0957-4484/17/19/017

Vučinić-Vasić M, Antić B, Kremenović AS, Nikoliv AS, Stoiljković M, Bibić NM, Spasojević V, Colomban P. Zn,Ni ferrite/NiO nanocomposite powder obtained from acetylacetonato complexes. in Nanotechnology. 2006;17(19):4877-4884.
doi:10.1088/0957-4484/17/19/017 .

Vučinić-Vasić, Milica, Antić, Bratislav, Kremenović, Aleksandar S., Nikoliv, A. S., Stoiljković, Milovan, Bibić, Nataša M., Spasojević, Vojislav, Colomban, Ph, "Zn,Ni ferrite/NiO nanocomposite powder obtained from acetylacetonato complexes" in Nanotechnology, 17, no. 19 (2006):4877-4884,
https://doi.org/10.1088/0957-4484/17/19/017 . .