TY  - JOUR
AU  - Cvejic, Z.
AU  - Antić, Bratislav
AU  - Kremenović, Aleksandar S.
AU  - Rakić, Srđan
AU  - Goya, Gerardo F.
AU  - Rechenberg, H. R.
AU  - Jovalekić, Čedomir
AU  - Spasojević, Vojislav
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3666
AB  - In this work we report results on the influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite. A series of Fe(2.85)RE(0.15)O(4) (RE = Gd, Dy, Ho, Tm and Yb) samples have been prepared by high energy ball milling. Structure/microstructure investigations of two selected samples Fe(2.85)Gd(0.15)O(4) and Fe(2.85)Tm(0.15)O(4), represent an extension of the previously published results on Fe(3)O(4)/gamma-Fe(2)O(3), Fe(2.85)Y(0.15)O(4) and Fe(2.55)In(0.45)O(4) [Z. Cvejic, S. Rakic, A. Kremenovic, B. Antic, C. Jovalekic. Ph. Colomban, Sol. State Sciences 8 (2006) 908], while magnetic characterization has been done for all the samples. Crystallite/particle size and strain determined by X-ray diffractometry and Transmission electron microscopy (TEM) confirmed the nanostructured nature of the mechanosynthesized materials. X-ray powder diffraction was used to analyze anisotropic line broadening effects through the Rietveld method. The size anisotropy was found to be small while strain anisotropy was large, indicating nonuniform distribution of deffects in the presence of Gd and Tm in the crystal structure. Superparamagnetic(SPM) behavior at room temperature was observed for all samples studied. The Y-substituted Fe(3)O(4) had the largest He and the lowest M(S). We discuss the changes in magnetic properties in relation to their magnetic anisotropy and microstructure. High field irreversibility (H GT 20kOe) in ZFC/FC magnetization versus temperature indicates the existence of high magnetocrystalline and/or strain induced anisotropy. (C) 2008 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite
VL  - 472
IS  - 1-2
SP  - 571
EP  - 575
DO  - 10.1016/j.jallcom.2008.05.026
ER  - 

@article{
author = "Cvejic, Z. and Antić, Bratislav and Kremenović, Aleksandar S. and Rakić, Srđan and Goya, Gerardo F. and Rechenberg, H. R. and Jovalekić, Čedomir and Spasojević, Vojislav",
year = "2009",
abstract = "In this work we report results on the influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite. A series of Fe(2.85)RE(0.15)O(4) (RE = Gd, Dy, Ho, Tm and Yb) samples have been prepared by high energy ball milling. Structure/microstructure investigations of two selected samples Fe(2.85)Gd(0.15)O(4) and Fe(2.85)Tm(0.15)O(4), represent an extension of the previously published results on Fe(3)O(4)/gamma-Fe(2)O(3), Fe(2.85)Y(0.15)O(4) and Fe(2.55)In(0.45)O(4) [Z. Cvejic, S. Rakic, A. Kremenovic, B. Antic, C. Jovalekic. Ph. Colomban, Sol. State Sciences 8 (2006) 908], while magnetic characterization has been done for all the samples. Crystallite/particle size and strain determined by X-ray diffractometry and Transmission electron microscopy (TEM) confirmed the nanostructured nature of the mechanosynthesized materials. X-ray powder diffraction was used to analyze anisotropic line broadening effects through the Rietveld method. The size anisotropy was found to be small while strain anisotropy was large, indicating nonuniform distribution of deffects in the presence of Gd and Tm in the crystal structure. Superparamagnetic(SPM) behavior at room temperature was observed for all samples studied. The Y-substituted Fe(3)O(4) had the largest He and the lowest M(S). We discuss the changes in magnetic properties in relation to their magnetic anisotropy and microstructure. High field irreversibility (H GT 20kOe) in ZFC/FC magnetization versus temperature indicates the existence of high magnetocrystalline and/or strain induced anisotropy. (C) 2008 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite",
volume = "472",
number = "1-2",
pages = "571-575",
doi = "10.1016/j.jallcom.2008.05.026"
}

Cvejic, Z., Antić, B., Kremenović, A. S., Rakić, S., Goya, G. F., Rechenberg, H. R., Jovalekić, Č.,& Spasojević, V.. (2009). Influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite. in Journal of Alloys and Compounds, 472(1-2), 571-575.
https://doi.org/10.1016/j.jallcom.2008.05.026

Cvejic Z, Antić B, Kremenović AS, Rakić S, Goya GF, Rechenberg HR, Jovalekić Č, Spasojević V. Influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite. in Journal of Alloys and Compounds. 2009;472(1-2):571-575.
doi:10.1016/j.jallcom.2008.05.026 .

Cvejic, Z., Antić, Bratislav, Kremenović, Aleksandar S., Rakić, Srđan, Goya, Gerardo F., Rechenberg, H. R., Jovalekić, Čedomir, Spasojević, Vojislav, "Influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite" in Journal of Alloys and Compounds, 472, no. 1-2 (2009):571-575,
https://doi.org/10.1016/j.jallcom.2008.05.026 . .

TY  - JOUR
AU  - Antić, Bratislav
AU  - Kremenović, Aleksandar S.
AU  - Draganic, I.
AU  - Colomban, Ph.
AU  - Vasiljević-Radović, Dana
AU  - Blanuša, Jovan
AU  - Tadić, Marin
AU  - Mitrić, Miodrag
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3715
AB  - We report the results of ion irradiation influence on rare earth sesquioxides structure, which are materials of practical importance as a radiation resistant ceramics in nuclear applications. Y2O3, Gd2O3 and Er2O3 sesquioxides in the pellet form were irradiated by oxygen ions (O2+) beam with the energy of 30 keV and implantation fluence of 5 x 10(20) m (2). Samples are characterized by Grazing Incidence X-ray Diffraction (GIXRD), Raman spectroscopy and atomic force microscopy (AFM). By GIXRD it was found partial transformation from cubic (C) to monoclinic (B) phase only in Gd2O3, induced by O2+ irradiation. This was confirmed by Raman spectroscopy. Although full phase transition from C to B phase in Y2O3 was not observed, the splitting and broadening of the main intensity Raman band for C phase could be explained by the stress and the disorder induced by the quenching. Analysis done by AFM showed changes in surface topology, i.e. values of average roughness (Ra) and root mean squared roughness (RMS) were significantly changed after irradiation for all samples. RMSs in Y2O3 before and after irradiation were 35 nm and 26 nm, respectively. (C) 2009 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Effects of O2+ ions beam irradiation on crystal structure of rare earth sesquioxides
VL  - 255
IS  - 17
SP  - 7601
EP  - 7604
DO  - 10.1016/j.apsusc.2009.04.035
ER  - 

@article{
author = "Antić, Bratislav and Kremenović, Aleksandar S. and Draganic, I. and Colomban, Ph. and Vasiljević-Radović, Dana and Blanuša, Jovan and Tadić, Marin and Mitrić, Miodrag",
year = "2009",
abstract = "We report the results of ion irradiation influence on rare earth sesquioxides structure, which are materials of practical importance as a radiation resistant ceramics in nuclear applications. Y2O3, Gd2O3 and Er2O3 sesquioxides in the pellet form were irradiated by oxygen ions (O2+) beam with the energy of 30 keV and implantation fluence of 5 x 10(20) m (2). Samples are characterized by Grazing Incidence X-ray Diffraction (GIXRD), Raman spectroscopy and atomic force microscopy (AFM). By GIXRD it was found partial transformation from cubic (C) to monoclinic (B) phase only in Gd2O3, induced by O2+ irradiation. This was confirmed by Raman spectroscopy. Although full phase transition from C to B phase in Y2O3 was not observed, the splitting and broadening of the main intensity Raman band for C phase could be explained by the stress and the disorder induced by the quenching. Analysis done by AFM showed changes in surface topology, i.e. values of average roughness (Ra) and root mean squared roughness (RMS) were significantly changed after irradiation for all samples. RMSs in Y2O3 before and after irradiation were 35 nm and 26 nm, respectively. (C) 2009 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Effects of O2+ ions beam irradiation on crystal structure of rare earth sesquioxides",
volume = "255",
number = "17",
pages = "7601-7604",
doi = "10.1016/j.apsusc.2009.04.035"
}

Antić, B., Kremenović, A. S., Draganic, I., Colomban, Ph., Vasiljević-Radović, D., Blanuša, J., Tadić, M.,& Mitrić, M.. (2009). Effects of O2+ ions beam irradiation on crystal structure of rare earth sesquioxides. in Applied Surface Science, 255(17), 7601-7604.
https://doi.org/10.1016/j.apsusc.2009.04.035

Antić B, Kremenović AS, Draganic I, Colomban P, Vasiljević-Radović D, Blanuša J, Tadić M, Mitrić M. Effects of O2+ ions beam irradiation on crystal structure of rare earth sesquioxides. in Applied Surface Science. 2009;255(17):7601-7604.
doi:10.1016/j.apsusc.2009.04.035 .

Antić, Bratislav, Kremenović, Aleksandar S., Draganic, I., Colomban, Ph., Vasiljević-Radović, Dana, Blanuša, Jovan, Tadić, Marin, Mitrić, Miodrag, "Effects of O2+ ions beam irradiation on crystal structure of rare earth sesquioxides" in Applied Surface Science, 255, no. 17 (2009):7601-7604,
https://doi.org/10.1016/j.apsusc.2009.04.035 . .

TY  - JOUR
AU  - Jokanović, Vukoman R.
AU  - Nedić, Zoran
AU  - Čolović, Božana M.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3580
AB  - In this study, the synthesis of thin films of Mg phosphorus doped tungsten bronzes (MgPTB; MgHPW(12)O(40).29H(2)O) by the self-assembly of nano-structured particles of MgPTB obtained using the ultrasonic spray pyrolysis method was investigated. As the precursor, MgPTB, prepared by the ionic exchange method, was used. Nano-structured particles of MgPTB were obtained using the ultrasonic spray pyrolysis method. The nano-structure of the particles used as the building blocks in the MgPTB thin film were investigated experimentally and theoretically, applying the model given in this article. The obtained data for the mean particle size and their size distribution show a high degree of agreement. These previously tailored particles used for the preparation of thin films during the next synthesis step, by their self-assembly over slow deposition on a silica glass substrate, show how it is possible to create thin MgPTB films under advance projected conditions of the applied physical fields with a fully determined nanostructure of their building block particles, with a relatively small roughness and unique physical properties.
T2  - Journal of Microscopy, Oxford
T1  - Modelling and experimental investigations of thin filmsof Mg phosphorus-doped tungsten bronzes obtainedby ultrasonic spray pyrolysis
VL  - 232
IS  - 3
SP  - 623
EP  - 628
DO  - 10.1111/j.1365-2818.2008.02128.x
ER  - 

@article{
author = "Jokanović, Vukoman R. and Nedić, Zoran and Čolović, Božana M.",
year = "2008",
abstract = "In this study, the synthesis of thin films of Mg phosphorus doped tungsten bronzes (MgPTB; MgHPW(12)O(40).29H(2)O) by the self-assembly of nano-structured particles of MgPTB obtained using the ultrasonic spray pyrolysis method was investigated. As the precursor, MgPTB, prepared by the ionic exchange method, was used. Nano-structured particles of MgPTB were obtained using the ultrasonic spray pyrolysis method. The nano-structure of the particles used as the building blocks in the MgPTB thin film were investigated experimentally and theoretically, applying the model given in this article. The obtained data for the mean particle size and their size distribution show a high degree of agreement. These previously tailored particles used for the preparation of thin films during the next synthesis step, by their self-assembly over slow deposition on a silica glass substrate, show how it is possible to create thin MgPTB films under advance projected conditions of the applied physical fields with a fully determined nanostructure of their building block particles, with a relatively small roughness and unique physical properties.",
journal = "Journal of Microscopy, Oxford",
title = "Modelling and experimental investigations of thin filmsof Mg phosphorus-doped tungsten bronzes obtainedby ultrasonic spray pyrolysis",
volume = "232",
number = "3",
pages = "623-628",
doi = "10.1111/j.1365-2818.2008.02128.x"
}

Jokanović, V. R., Nedić, Z.,& Čolović, B. M.. (2008). Modelling and experimental investigations of thin filmsof Mg phosphorus-doped tungsten bronzes obtainedby ultrasonic spray pyrolysis. in Journal of Microscopy, Oxford, 232(3), 623-628.
https://doi.org/10.1111/j.1365-2818.2008.02128.x

Jokanović VR, Nedić Z, Čolović BM. Modelling and experimental investigations of thin filmsof Mg phosphorus-doped tungsten bronzes obtainedby ultrasonic spray pyrolysis. in Journal of Microscopy, Oxford. 2008;232(3):623-628.
doi:10.1111/j.1365-2818.2008.02128.x .

Jokanović, Vukoman R., Nedić, Zoran, Čolović, Božana M., "Modelling and experimental investigations of thin filmsof Mg phosphorus-doped tungsten bronzes obtainedby ultrasonic spray pyrolysis" in Journal of Microscopy, Oxford, 232, no. 3 (2008):623-628,
https://doi.org/10.1111/j.1365-2818.2008.02128.x . .