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  - Vučinić-Vasić, Milica
AU  - Antić, Bratislav
AU  - Kremenović, Aleksandar S.
AU  - Nikolić, Aleksandar S.
AU  - Blanuša, Jovan
AU  - Rakić, Srđan
AU  - Spasojević, Vojislav
AU  - Kapor, Agneš
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3146
AB  - Applying a new synthesis route based on the thermal decomposition of a mixture acetylacetonato complexes, Li(AA), La(AA)(3) and Fe(AA)(3), Li, La ferrite (Li0.5La0.08Fe2.42O4) was formed. The element analysis performed by ICP technique and the Rietveld refinement data indicate that the sample is composed of three phases: Li0.5La0.008Fe2.42O4 (69%, SG P4(3)32, a = 8.3445(3) angstrom), La0.14Fe3O4 (16%, SG Fd (3) over barm, a = 8.403(1) angstrom) and LiFeO2 (15%, SG Fm (3) over barm, a = 4.2291(8) angstrom). A partial substitution Fe3+ - GT La3+ in Li ferrite and La insertion at 16c site in Fe3O4 occur at low concentrations. A partial cation ordering at 4b and 12d octahedral sites in Li0.5La0.08Fe2.42O4 was noticed. TEM micrograph shows that the nanoparticles are spherically shaped and that the particle distribution is in the range between 7 and 33 nm. The sample exhibits superparamagnetic behavior, thus the composite has potential industrial applications. (c) 2006 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Investigation of nanocrystalline phases in Li-La-Fe-O system formed by the decomposition of acetylacetonato complexes
VL  - 428
IS  - 1-2
SP  - 322
EP  - 326
DO  - 10.1016/j.jallcom.2006.03.042
ER  - 

@article{
author = "Vučinić-Vasić, Milica and Antić, Bratislav and Kremenović, Aleksandar S. and Nikolić, Aleksandar S. and Blanuša, Jovan and Rakić, Srđan and Spasojević, Vojislav and Kapor, Agneš",
year = "2007",
abstract = "Applying a new synthesis route based on the thermal decomposition of a mixture acetylacetonato complexes, Li(AA), La(AA)(3) and Fe(AA)(3), Li, La ferrite (Li0.5La0.08Fe2.42O4) was formed. The element analysis performed by ICP technique and the Rietveld refinement data indicate that the sample is composed of three phases: Li0.5La0.008Fe2.42O4 (69%, SG P4(3)32, a = 8.3445(3) angstrom), La0.14Fe3O4 (16%, SG Fd (3) over barm, a = 8.403(1) angstrom) and LiFeO2 (15%, SG Fm (3) over barm, a = 4.2291(8) angstrom). A partial substitution Fe3+ - GT La3+ in Li ferrite and La insertion at 16c site in Fe3O4 occur at low concentrations. A partial cation ordering at 4b and 12d octahedral sites in Li0.5La0.08Fe2.42O4 was noticed. TEM micrograph shows that the nanoparticles are spherically shaped and that the particle distribution is in the range between 7 and 33 nm. The sample exhibits superparamagnetic behavior, thus the composite has potential industrial applications. (c) 2006 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Investigation of nanocrystalline phases in Li-La-Fe-O system formed by the decomposition of acetylacetonato complexes",
volume = "428",
number = "1-2",
pages = "322-326",
doi = "10.1016/j.jallcom.2006.03.042"
}

Vučinić-Vasić, M., Antić, B., Kremenović, A. S., Nikolić, A. S., Blanuša, J., Rakić, S., Spasojević, V.,& Kapor, A.. (2007). Investigation of nanocrystalline phases in Li-La-Fe-O system formed by the decomposition of acetylacetonato complexes. in Journal of Alloys and Compounds, 428(1-2), 322-326.
https://doi.org/10.1016/j.jallcom.2006.03.042

Vučinić-Vasić M, Antić B, Kremenović AS, Nikolić AS, Blanuša J, Rakić S, Spasojević V, Kapor A. Investigation of nanocrystalline phases in Li-La-Fe-O system formed by the decomposition of acetylacetonato complexes. in Journal of Alloys and Compounds. 2007;428(1-2):322-326.
doi:10.1016/j.jallcom.2006.03.042 .

Vučinić-Vasić, Milica, Antić, Bratislav, Kremenović, Aleksandar S., Nikolić, Aleksandar S., Blanuša, Jovan, Rakić, Srđan, Spasojević, Vojislav, Kapor, Agneš, "Investigation of nanocrystalline phases in Li-La-Fe-O system formed by the decomposition of acetylacetonato complexes" in Journal of Alloys and Compounds, 428, no. 1-2 (2007):322-326,
https://doi.org/10.1016/j.jallcom.2006.03.042 . .