Cation distributions estimated using the magnetic moments of the spinel ferrites CO1-xCrxFe2O4 at 10 K

（A）[B]2O4 ferrite samples with the composition COl_xCrxFe204 （0.0 ≤ x ≤1.0） are prepared using a hydrothermal method, and subjected to calcining in a tube furnace with an argon-flow at 1673 K for 2 h. X-ray diffraction patterns indicate that each of all the samples has a single phase cubic spinel st...

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Published in中国物理B：英文版 no. 10; pp. 519 - 528
Main Author 尚志丰 齐伟华 纪登辉 徐静 唐贵德 张晓云 李壮志 郎莉莉
Format Journal Article
LanguageEnglish
Published 01.10.2014
Subjects
Cr2
尖晶石结构
尖晶石铁氧体
矩估计
衍射图案
量子力学模型
阳离子分布
饱和磁化强度
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Summary:（A）[B]2O4 ferrite samples with the composition COl_xCrxFe204 （0.0 ≤ x ≤1.0） are prepared using a hydrothermal method, and subjected to calcining in a tube furnace with an argon-flow at 1673 K for 2 h. X-ray diffraction patterns indicate that each of all the samples has a single phase cubic spinel structure with a space group of Fd3m. Magnetic measurements show that the saturation magnetization decreases with as the Cr content x increases. The cation distribution of the samples is estimated by fitting the dependence of the magnetic moments on x at l 0 K, using the quantum mechanical model previously proposed by our group. The calculated sum of the content values of the Cr3＋ and Cr2＋ cations occupying the （A） sites increases as the value of x increases. In the fitting process, the magnetic moment directions of the Cr3＋ and Cr2＋ cations are assumed to be antiparallel to those of the Fe and Co cations, respectively, which is in accordance with Hund＇s rules.
Bibliography:Shang Zhi-Feng, Qi Wei-Hua, Ji Deng-Hui, Xu Jing, Tang Gui-De, Zhang Xiao-Yun, Li Zhuang-Zhi, and Lang Li-Li（ a）Hebei Advanced Thin Film Laboratory, Department of Physics, Hcbei Normal University, Shifiazhuang 050024, China b）Department of Physics and Electronic Science, Liupanshui Normal University, Liupanshui 553004, China
（A）[B]2O4 ferrite samples with the composition COl_xCrxFe204 （0.0 ≤ x ≤1.0） are prepared using a hydrothermal method, and subjected to calcining in a tube furnace with an argon-flow at 1673 K for 2 h. X-ray diffraction patterns indicate that each of all the samples has a single phase cubic spinel structure with a space group of Fd3m. Magnetic measurements show that the saturation magnetization decreases with as the Cr content x increases. The cation distribution of the samples is estimated by fitting the dependence of the magnetic moments on x at l 0 K, using the quantum mechanical model previously proposed by our group. The calculated sum of the content values of the Cr3＋ and Cr2＋ cations occupying the （A） sites increases as the value of x increases. In the fitting process, the magnetic moment directions of the Cr3＋ and Cr2＋ cations are assumed to be antiparallel to those of the Fe and Co cations, respectively, which is in accordance with Hund＇s rules.
spinel ferrite, magnetic property, cation distribution, ionicity
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/23/10/107503