Magnetic Properties of Lithium Ferrite Nanoparticles with a Core/Shell Structure
Апстракт
We present a magnetic study of lithium ferrite nanoparticles of composition Li0.5Fe2.5O4, synthesized by a citrate gel decomposition method. The as prepared sample was composed of nearly spherical nanoparticles with an average particle size LT d GT (TEM)similar to 12 nm. Further annealing at 573 K and 673 K for 4 hours did not increase particle size noticeably, while annealing at 973 K led to morphology changes and significant increase in size ranging from 40 to above 200 nm. The magnetic properties of samples have been studied using Mossbauer specroscopy, and static magnetic measurements. The hyperfine parameters obtained from Mossbauer data at T = 10 K are in agreement to the bulk lithium ferrite phase. Annealed samples showed an evolution from monodomain structure to polycrystalline behaviour, what is evident from TEM imagines, as well as the evolution of the coercive filed, H-C, and the saturation magnetization, M-S, with particle size increase. The exchange interactions have been ...observed in the single-domain nanoparticles, which probably originate from their core-shell structure. At low temperatures and in high enough magnetic fields, the cubic magnetic anisotropy stays preserved and the magnetic moments in the particle core are aligned along LT 111 GT directions of the spinel structure.
Кључне речи:
Anisotropy / ferrites / nanostructured materials / magnetic measurements / Mossbauer spectroscopy / oxide materialsИзвор:
Current Nanoscience, 2012, 8, 5, 651-658Финансирање / пројекти:
- Магнетни и радионуклидима обележени наноструктурни материјали за примене у медицини (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45015)
DOI: 10.2174/157341312802884391
ISSN: 1573-4137; 1875-6786
WoS: 000310390700001
Scopus: 2-s2.0-84867834681
Колекције
Институција/група
VinčaTY - JOUR AU - Jović, Nataša G. AU - Antić, Bratislav AU - Goya, Gerardo F. AU - Spasojević, Vojislav PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/5125 AB - We present a magnetic study of lithium ferrite nanoparticles of composition Li0.5Fe2.5O4, synthesized by a citrate gel decomposition method. The as prepared sample was composed of nearly spherical nanoparticles with an average particle size LT d GT (TEM)similar to 12 nm. Further annealing at 573 K and 673 K for 4 hours did not increase particle size noticeably, while annealing at 973 K led to morphology changes and significant increase in size ranging from 40 to above 200 nm. The magnetic properties of samples have been studied using Mossbauer specroscopy, and static magnetic measurements. The hyperfine parameters obtained from Mossbauer data at T = 10 K are in agreement to the bulk lithium ferrite phase. Annealed samples showed an evolution from monodomain structure to polycrystalline behaviour, what is evident from TEM imagines, as well as the evolution of the coercive filed, H-C, and the saturation magnetization, M-S, with particle size increase. The exchange interactions have been observed in the single-domain nanoparticles, which probably originate from their core-shell structure. At low temperatures and in high enough magnetic fields, the cubic magnetic anisotropy stays preserved and the magnetic moments in the particle core are aligned along LT 111 GT directions of the spinel structure. T2 - Current Nanoscience T1 - Magnetic Properties of Lithium Ferrite Nanoparticles with a Core/Shell Structure VL - 8 IS - 5 SP - 651 EP - 658 DO - 10.2174/157341312802884391 ER -
@article{ author = "Jović, Nataša G. and Antić, Bratislav and Goya, Gerardo F. and Spasojević, Vojislav", year = "2012", abstract = "We present a magnetic study of lithium ferrite nanoparticles of composition Li0.5Fe2.5O4, synthesized by a citrate gel decomposition method. The as prepared sample was composed of nearly spherical nanoparticles with an average particle size LT d GT (TEM)similar to 12 nm. Further annealing at 573 K and 673 K for 4 hours did not increase particle size noticeably, while annealing at 973 K led to morphology changes and significant increase in size ranging from 40 to above 200 nm. The magnetic properties of samples have been studied using Mossbauer specroscopy, and static magnetic measurements. The hyperfine parameters obtained from Mossbauer data at T = 10 K are in agreement to the bulk lithium ferrite phase. Annealed samples showed an evolution from monodomain structure to polycrystalline behaviour, what is evident from TEM imagines, as well as the evolution of the coercive filed, H-C, and the saturation magnetization, M-S, with particle size increase. The exchange interactions have been observed in the single-domain nanoparticles, which probably originate from their core-shell structure. At low temperatures and in high enough magnetic fields, the cubic magnetic anisotropy stays preserved and the magnetic moments in the particle core are aligned along LT 111 GT directions of the spinel structure.", journal = "Current Nanoscience", title = "Magnetic Properties of Lithium Ferrite Nanoparticles with a Core/Shell Structure", volume = "8", number = "5", pages = "651-658", doi = "10.2174/157341312802884391" }
Jović, N. G., Antić, B., Goya, G. F.,& Spasojević, V.. (2012). Magnetic Properties of Lithium Ferrite Nanoparticles with a Core/Shell Structure. in Current Nanoscience, 8(5), 651-658. https://doi.org/10.2174/157341312802884391
Jović NG, Antić B, Goya GF, Spasojević V. Magnetic Properties of Lithium Ferrite Nanoparticles with a Core/Shell Structure. in Current Nanoscience. 2012;8(5):651-658. doi:10.2174/157341312802884391 .
Jović, Nataša G., Antić, Bratislav, Goya, Gerardo F., Spasojević, Vojislav, "Magnetic Properties of Lithium Ferrite Nanoparticles with a Core/Shell Structure" in Current Nanoscience, 8, no. 5 (2012):651-658, https://doi.org/10.2174/157341312802884391 . .