TY  - JOUR
AU  - Kremenović, Aleksandar S.
AU  - Antić, Bratislav
AU  - Blanuša, Jovan
AU  - Čomor, Mirjana
AU  - Colomban, Philippe
AU  - Mazerolles, Leo
AU  - Božin, Emil S.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4246
AB  - Here we report results of systematic investigation of heterogeneity and disorder in Ti1-xFeyO2-d nanorod rutile-based flowerlike aggregates. It was found that Ti1-xFeyO2-d aggregates are composed of two crystalline phases: rutile as a dominant and anatase as a minor phase. Flowerlike aggregates were found to grow from an isometric core ca. 5-10 nm in diameter that was built from anatase and rutile nanorods ca. 5 x 100 nm that were grown on the anatase surface having base plane (001) intergrowth with an anatase plane. The direction of rutile nanorods growth, i.e., direction of the nanorod elongation, was [001]. Highly nonisometric rutile crystals produce anisotropic X-ray powder diffraction line broadening and doubling of vibrational bands in Raman spectra. Both these techniques confirmed nonisometric character of rutile crystals and gave a quantitative measure of crystal shape anisotropy in excellent agreement with high-resolution transmission electron microscopy measurements. In addition, from the atomic pair distribution function and Raman spectral analyses the level of vacancy concentration was determined in rutile and anatase phases of investigated samples.
T2  - Journal of Physical Chemistry. C
T1  - Heterogeneity and Disorder in Ti1-xFeyO2-d Nanocrystal Rutile-Based Flowerlike Aggregates: Detection of Anatase
VL  - 115
IS  - 11
SP  - 4395
EP  - 4403
DO  - 10.1021/jp109437b
ER  - 

@article{
author = "Kremenović, Aleksandar S. and Antić, Bratislav and Blanuša, Jovan and Čomor, Mirjana and Colomban, Philippe and Mazerolles, Leo and Božin, Emil S.",
year = "2011",
abstract = "Here we report results of systematic investigation of heterogeneity and disorder in Ti1-xFeyO2-d nanorod rutile-based flowerlike aggregates. It was found that Ti1-xFeyO2-d aggregates are composed of two crystalline phases: rutile as a dominant and anatase as a minor phase. Flowerlike aggregates were found to grow from an isometric core ca. 5-10 nm in diameter that was built from anatase and rutile nanorods ca. 5 x 100 nm that were grown on the anatase surface having base plane (001) intergrowth with an anatase plane. The direction of rutile nanorods growth, i.e., direction of the nanorod elongation, was [001]. Highly nonisometric rutile crystals produce anisotropic X-ray powder diffraction line broadening and doubling of vibrational bands in Raman spectra. Both these techniques confirmed nonisometric character of rutile crystals and gave a quantitative measure of crystal shape anisotropy in excellent agreement with high-resolution transmission electron microscopy measurements. In addition, from the atomic pair distribution function and Raman spectral analyses the level of vacancy concentration was determined in rutile and anatase phases of investigated samples.",
journal = "Journal of Physical Chemistry. C",
title = "Heterogeneity and Disorder in Ti1-xFeyO2-d Nanocrystal Rutile-Based Flowerlike Aggregates: Detection of Anatase",
volume = "115",
number = "11",
pages = "4395-4403",
doi = "10.1021/jp109437b"
}

Kremenović, A. S., Antić, B., Blanuša, J., Čomor, M., Colomban, P., Mazerolles, L.,& Božin, E. S.. (2011). Heterogeneity and Disorder in Ti1-xFeyO2-d Nanocrystal Rutile-Based Flowerlike Aggregates: Detection of Anatase. in Journal of Physical Chemistry. C, 115(11), 4395-4403.
https://doi.org/10.1021/jp109437b

Kremenović AS, Antić B, Blanuša J, Čomor M, Colomban P, Mazerolles L, Božin ES. Heterogeneity and Disorder in Ti1-xFeyO2-d Nanocrystal Rutile-Based Flowerlike Aggregates: Detection of Anatase. in Journal of Physical Chemistry. C. 2011;115(11):4395-4403.
doi:10.1021/jp109437b .

Kremenović, Aleksandar S., Antić, Bratislav, Blanuša, Jovan, Čomor, Mirjana, Colomban, Philippe, Mazerolles, Leo, Božin, Emil S., "Heterogeneity and Disorder in Ti1-xFeyO2-d Nanocrystal Rutile-Based Flowerlike Aggregates: Detection of Anatase" in Journal of Physical Chemistry. C, 115, no. 11 (2011):4395-4403,
https://doi.org/10.1021/jp109437b . .

TY  - JOUR
AU  - Kremenović, Aleksandar S.
AU  - Antić, Bratislav
AU  - Vučinić-Vasić, Milica
AU  - Colomban, Philippe
AU  - Jovalekić, Čedomir
AU  - Bibić, Nataša M.
AU  - Kahlenberg, Volker
AU  - Leoni, Matteo
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4028
AB  - The crystal structure and microstructure of as-prepared and annealed Ni0.9Zn0.1O were refined at room temperature in both the Fm (3) over barm and R (3) over barm space groups. It is shown that below the Neel point (458 K), where magnetic ordering triggers the presence of a trigonal strain, the common usage of a higher-symmetry non-admissible space group for crystal structure and microstructure analysis via the Rietveld method may result in both an incorrect structure description and incorrect microstructure parameters (size and strain). More realistic microstructure data can be obtained by whole powder pattern modelling of the powder diffraction data. Increasing the annealing temperature causes a reduction of the trigonal distortion as well as an increase in domain size. Simultaneously, the Raman spectra become less resolved, a clear indication of domain growth and structural evolution of the structure towards cubic symmetry (R (3) over barm - GT Fm (3) over barm).
T2  - Journal of Applied Crystallography
T1  - Temperature-induced structure and microstructure evolution of nanostructured Ni0.9Zn0.1O
VL  - 43
SP  - 699
EP  - 709
DO  - 10.1107/S0021889810019163
ER  - 

@article{
author = "Kremenović, Aleksandar S. and Antić, Bratislav and Vučinić-Vasić, Milica and Colomban, Philippe and Jovalekić, Čedomir and Bibić, Nataša M. and Kahlenberg, Volker and Leoni, Matteo",
year = "2010",
abstract = "The crystal structure and microstructure of as-prepared and annealed Ni0.9Zn0.1O were refined at room temperature in both the Fm (3) over barm and R (3) over barm space groups. It is shown that below the Neel point (458 K), where magnetic ordering triggers the presence of a trigonal strain, the common usage of a higher-symmetry non-admissible space group for crystal structure and microstructure analysis via the Rietveld method may result in both an incorrect structure description and incorrect microstructure parameters (size and strain). More realistic microstructure data can be obtained by whole powder pattern modelling of the powder diffraction data. Increasing the annealing temperature causes a reduction of the trigonal distortion as well as an increase in domain size. Simultaneously, the Raman spectra become less resolved, a clear indication of domain growth and structural evolution of the structure towards cubic symmetry (R (3) over barm - GT Fm (3) over barm).",
journal = "Journal of Applied Crystallography",
title = "Temperature-induced structure and microstructure evolution of nanostructured Ni0.9Zn0.1O",
volume = "43",
pages = "699-709",
doi = "10.1107/S0021889810019163"
}

Kremenović, A. S., Antić, B., Vučinić-Vasić, M., Colomban, P., Jovalekić, Č., Bibić, N. M., Kahlenberg, V.,& Leoni, M.. (2010). Temperature-induced structure and microstructure evolution of nanostructured Ni0.9Zn0.1O. in Journal of Applied Crystallography, 43, 699-709.
https://doi.org/10.1107/S0021889810019163

Kremenović AS, Antić B, Vučinić-Vasić M, Colomban P, Jovalekić Č, Bibić NM, Kahlenberg V, Leoni M. Temperature-induced structure and microstructure evolution of nanostructured Ni0.9Zn0.1O. in Journal of Applied Crystallography. 2010;43:699-709.
doi:10.1107/S0021889810019163 .

Kremenović, Aleksandar S., Antić, Bratislav, Vučinić-Vasić, Milica, Colomban, Philippe, Jovalekić, Čedomir, Bibić, Nataša M., Kahlenberg, Volker, Leoni, Matteo, "Temperature-induced structure and microstructure evolution of nanostructured Ni0.9Zn0.1O" in Journal of Applied Crystallography, 43 (2010):699-709,
https://doi.org/10.1107/S0021889810019163 . .

TY  - JOUR
AU  - Vučinić-Vasić, Milica
AU  - Kremenović, Aleksandar S.
AU  - Nikolić, Aleksandar S.
AU  - Colomban, Philippe
AU  - Mazzerolles, Leo
AU  - Kahlenberg, Volker
AU  - Antić, Bratislav
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4055
AB  - This paper reports results concerning the crystal structure of core and shell as well as microstructure of 25 nm-ytterbium sesquioxide (Yb(2)O(3)) nanoparticles synthesized using a unique method based on thermal decomposition of a 2,4 pentadione complex. Used Raman spectroscopy measurements indicate core/shell structure, with monoclinic or a mixture of monoclinic and cubic symmetry of the particle shell. In addition, XRPD and SAED confirmed bixbyite structure type for the core (space group Ia (3) over bar). Broadening of the observed Raman bands indicates structural distortions in the nanocrystalline sample. The size/strain analysis was done on XRPD data using Fullprof/MarqX approach. Anisotropy of X-ray line broadening is caused by size effects only. The resulting mean microstrain (6 x 10(-4)) points to a low concentration of defects within the crystallites. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Core and shell structure of ytterbium sesquioxide nanoparticles
VL  - 502
IS  - 1
SP  - 107
EP  - 111
DO  - 10.1016/j.jallcom.2010.03.158
ER  - 

@article{
author = "Vučinić-Vasić, Milica and Kremenović, Aleksandar S. and Nikolić, Aleksandar S. and Colomban, Philippe and Mazzerolles, Leo and Kahlenberg, Volker and Antić, Bratislav",
year = "2010",
abstract = "This paper reports results concerning the crystal structure of core and shell as well as microstructure of 25 nm-ytterbium sesquioxide (Yb(2)O(3)) nanoparticles synthesized using a unique method based on thermal decomposition of a 2,4 pentadione complex. Used Raman spectroscopy measurements indicate core/shell structure, with monoclinic or a mixture of monoclinic and cubic symmetry of the particle shell. In addition, XRPD and SAED confirmed bixbyite structure type for the core (space group Ia (3) over bar). Broadening of the observed Raman bands indicates structural distortions in the nanocrystalline sample. The size/strain analysis was done on XRPD data using Fullprof/MarqX approach. Anisotropy of X-ray line broadening is caused by size effects only. The resulting mean microstrain (6 x 10(-4)) points to a low concentration of defects within the crystallites. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Core and shell structure of ytterbium sesquioxide nanoparticles",
volume = "502",
number = "1",
pages = "107-111",
doi = "10.1016/j.jallcom.2010.03.158"
}

Vučinić-Vasić, M., Kremenović, A. S., Nikolić, A. S., Colomban, P., Mazzerolles, L., Kahlenberg, V.,& Antić, B.. (2010). Core and shell structure of ytterbium sesquioxide nanoparticles. in Journal of Alloys and Compounds, 502(1), 107-111.
https://doi.org/10.1016/j.jallcom.2010.03.158

Vučinić-Vasić M, Kremenović AS, Nikolić AS, Colomban P, Mazzerolles L, Kahlenberg V, Antić B. Core and shell structure of ytterbium sesquioxide nanoparticles. in Journal of Alloys and Compounds. 2010;502(1):107-111.
doi:10.1016/j.jallcom.2010.03.158 .

Vučinić-Vasić, Milica, Kremenović, Aleksandar S., Nikolić, Aleksandar S., Colomban, Philippe, Mazzerolles, Leo, Kahlenberg, Volker, Antić, Bratislav, "Core and shell structure of ytterbium sesquioxide nanoparticles" in Journal of Alloys and Compounds, 502, no. 1 (2010):107-111,
https://doi.org/10.1016/j.jallcom.2010.03.158 . .

TY  - JOUR
AU  - Cvejic, Zeljka
AU  - Rakić, Srđan
AU  - Kremenović, Aleksandar S.
AU  - Antić, Bratislav
AU  - Jovalekić, Čedomir
AU  - Colomban, Philippe
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3062
AB  - Spinels samples Fe2.85Y0.15O4 (S1) and Fe2.55In0.45O4 (S2), such as Fe3O4 + gamma-Fe2O3 (S3) were obtained by ball milling. TEM micrograph as well as XRPD line broadening analyses show nanosize nature of the ferrite powders. Cation distribution, found by Rietveld refinement of the site occupancies, indicate Y3+ ions presence at 16d sites in Fe2.85Y0.15O4, and a random In3+ ions distribution on both 8a and 16d sites in Fe2.55In0.45O4 (space group Fd (3) over barm). From the XRPD line broadening analysis crystallite size and strain values were determined. The crystallite size and strain anisotropy is significant, especially for Fe2.85Y0.15O4 and Fe2.55In0.45O4. This result is discussed regarding the influence of the cation substitutions. The Raman signature confirms the spinel structure and the homogeneity of the particles. (c) 2006 Elsevier SAS. All rights reserved.
T2  - Solid State Sciences
T1  - Nanosize ferrites obtained by ball milling: Crystal structure, cation distribution, size-strain analysis and Raman investigations
VL  - 8
IS  - 8
SP  - 908
EP  - 915
DO  - 10.1016/j.solidstatesciences.2006.02.041
ER  - 

@article{
author = "Cvejic, Zeljka and Rakić, Srđan and Kremenović, Aleksandar S. and Antić, Bratislav and Jovalekić, Čedomir and Colomban, Philippe",
year = "2006",
abstract = "Spinels samples Fe2.85Y0.15O4 (S1) and Fe2.55In0.45O4 (S2), such as Fe3O4 + gamma-Fe2O3 (S3) were obtained by ball milling. TEM micrograph as well as XRPD line broadening analyses show nanosize nature of the ferrite powders. Cation distribution, found by Rietveld refinement of the site occupancies, indicate Y3+ ions presence at 16d sites in Fe2.85Y0.15O4, and a random In3+ ions distribution on both 8a and 16d sites in Fe2.55In0.45O4 (space group Fd (3) over barm). From the XRPD line broadening analysis crystallite size and strain values were determined. The crystallite size and strain anisotropy is significant, especially for Fe2.85Y0.15O4 and Fe2.55In0.45O4. This result is discussed regarding the influence of the cation substitutions. The Raman signature confirms the spinel structure and the homogeneity of the particles. (c) 2006 Elsevier SAS. All rights reserved.",
journal = "Solid State Sciences",
title = "Nanosize ferrites obtained by ball milling: Crystal structure, cation distribution, size-strain analysis and Raman investigations",
volume = "8",
number = "8",
pages = "908-915",
doi = "10.1016/j.solidstatesciences.2006.02.041"
}

Cvejic, Z., Rakić, S., Kremenović, A. S., Antić, B., Jovalekić, Č.,& Colomban, P.. (2006). Nanosize ferrites obtained by ball milling: Crystal structure, cation distribution, size-strain analysis and Raman investigations. in Solid State Sciences, 8(8), 908-915.
https://doi.org/10.1016/j.solidstatesciences.2006.02.041

Cvejic Z, Rakić S, Kremenović AS, Antić B, Jovalekić Č, Colomban P. Nanosize ferrites obtained by ball milling: Crystal structure, cation distribution, size-strain analysis and Raman investigations. in Solid State Sciences. 2006;8(8):908-915.
doi:10.1016/j.solidstatesciences.2006.02.041 .

Cvejic, Zeljka, Rakić, Srđan, Kremenović, Aleksandar S., Antić, Bratislav, Jovalekić, Čedomir, Colomban, Philippe, "Nanosize ferrites obtained by ball milling: Crystal structure, cation distribution, size-strain analysis and Raman investigations" in Solid State Sciences, 8, no. 8 (2006):908-915,
https://doi.org/10.1016/j.solidstatesciences.2006.02.041 . .