Mossbauer study of cobalt ferrite nanocrystals substituted with rare-earth Y3+ ions

被引：108
|
作者：
Meng, Xiangdong [1 ,2 ]
Li, Haibo [1 ]
Chen, Jingyan [1 ]
Mei, Liu [1 ]
Wang, Keqiang [2 ]
Li, Xiao [2 ]
机构：
[1] Jilin Normal Univ, Phys Coll, Siping 136000, Peoples R China
[2] Harbin Inst Technol, Ctr Composite Mat & Struct, Harbin 150001, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 09期
关键词：
Mossbauer spectrum; Ferrite; Superparamagnetism; Nanocrystallite; Hyperfine field; MAGNETIC-PROPERTIES;
D O I：
10.1016/j.jmmm.2008.10.041
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Mossbauer spectroscopy is used to characterize the crystallite size and structure of CoFe2-xYxO4 (x = 0, 0.1, 0.3, 0.5) ferrite nanocrystallites synthesized by the sol-gel auto- combustion method. The effect of the substitution of Fe3+ ions by Y3+ ions on the structure of cobalt ferrite nanocrystallites is investigated. The Mossbauer spectra showed two sets of six-line hyperfine patterns for all the samples, indicating the presence of Fe in both A and B-sites. On increasing the concentration of doped Y, the hyperfine field strength and the isomer shift first increase and then decrease, whereas the quadrupole splitting continuously increases. The superparamagnetism was observed for all the samples and the change of ratio of the superparamagnetism component reflects the size of crystal grain. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1155 / 1158
页数：4
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