Magnetic diphase nanostructure of ZnFe2O4/γ-Fe2O3

被引：37
|
作者：
Bo, Xiangxi
Li, Guangshe
Qiu, Xiaoqing
Xue, Yanfeng
Li, Liping [1 ]
机构：
[1] Chinese Acad Sci, State Key Struct Chem Lab, Grad Sch, Fuzhou 350002, Peoples R China
[2] Chinese Acad Sci, Fujian Inst Res Struct Matter, Grad Sch, Fuzhou 350002, Peoples R China
[3] Jilin Univ, Dept Phys, Changchun 130023, Peoples R China
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2007年 / 180卷 / 03期
基金：
中国国家自然科学基金;
关键词：
solvothermal; ZnFe2O4; gamma-Fe2O3; diphase nanostructure; superparamagnetic;
D O I：
10.1016/j.jssc.2006.12.034
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Magnetic diphase nanostructures of ZnFe2O4/gamma-Fe2O3 were synthesized by a solvothermal method. The formation reactions were optimized by tuning the initial molar ratios of Fe/Zn. All samples were characterized by X-ray diffraction, thermogravimetric analysis, infrared spectroscopy, and Raman spectra. It is found that when the initial molar ratio of Fe/Zn is larger than 2, a diphase magnetic natiostructure of ZnFe2O4/gamma-Fe2O3 was formed, in which the presence of ZnFe2O4 enhanced the thermal stability of gamma-Fe2O3. Further increasing the initial molar ratio of Fe/Zn larger than 6 destabilized the diphase nanostructure and yielded traces of secondary phase alpha-Fe2O3. The grain surfaces of diphase nanostructure exhibited a spin-glass-like structure. At room temperature, all diphase nanostructures are superparamagnetic with saturation magnetization being increased with gamma-Fe2O3 content. (c) 2007 Elsevier Inc. All rights reserved.
引用
收藏
页码：1038 / 1044
页数：7
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