Kinetics and magnetic properties of sol-gel derived NiZn ferrite-SiO2 Composites

被引：34

作者：

He, XH ^{[1
]}

Zhang, QQ ^{[1
]}

Ling, ZY ^{[1
]}

机构：

[1] S China Univ Technol, Dept Elect Mat Sci & Engn, Guangzhou 510640, Peoples R China

来源：

MATERIALS LETTERS | 2003年 / 57卷 / 20期

关键词：

sol-gel processing; NiZn ferrite-SiO2; composite materials; heat treatment; kinetics; nanocrystalline;

D O I：

10.1016/S0167-577X(02)01426-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

NiZn ferrite-SiO2 composites are synthesized by a sol-gel method. The chemical and structural changes of gels during heat treatment are analyzed using DTA, infrared spectra (IR) spectra and XRD. Several kinetic models in predicting the formation of ferrite are assessed. The result indicates that the rate of ferrite formation in sol-gel derived composites is best represented by Blum and Li's equation, dx/d=(k-x)/t. Variation of initial permeability with composition is discussed and possible magnetic mechanisms are investigated. Grain size and the continuity of magnetic circuit are the main factors to determine magnetic properties of ferrite composite materials. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：3031 / 3036

页数：6

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