Sol-gel preparation and characterization of CoFe2O4-SiO2 nanocomposites

被引：27

作者：

Huang, XH ^{[1
]}

Chen, ZH ^{[1
]}

机构：

[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2004年 / 132卷 / 12期

关键词：

chemical synthesis; silica; magnetic properties; ferrites;

D O I：

10.1016/j.ssc.2004.09.060

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetic nanocomposites formed by cobalt ferrite particles dispersed in a silica matrix were prepared by a sol-gel process. The effects of the thermal treatment temperature and the salt concentration on the structural and magnetic properties of the composites were investigated. By controlling these parameters, CoFe2O4/SiO2 nanocomposites with different crystallite size and magnetic properties were obtained. By increasing the annealing temperature and salt concentration, composites with a progressive increase in the coercive field and of the density of magnetization were produced. In particular, a nanocomposite, with a Fe/Si molar concentration of 21%, obtained by drying the gel at 150degreesC and further annealing at 800degreesC, has a coercivity of 2000 Oe, which is more than twice higher than the coercivity of bulk cobalt ferrite. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：845 / 850

页数：6

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