Electrical and micro structural properties of (Zn, Nb, Fe)-doped SnO2 varistor systems

被引：29

作者：

Parra, R

Varela, JA

Aldao, CM

Castro, MS

机构：

[1] UNMdP, CONICET, INTEMA, Inst Mat Sci & Technol, Mar Del Plata, Buenos Aires, Argentina

[2] UNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil

来源：

CERAMICS INTERNATIONAL | 2005年 / 31卷 / 05期

基金：

巴西圣保罗研究基金会;

关键词：

microstructure-final; electrical properties; impedance; varistors; tin dioxide;

D O I：

10.1016/j.ceramint.2004.08.009

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The electrical and microstructural properties of SnO2-based varistors with the addition of 0.025 and 0.050 mol% of Fe2O3 have been characterised. Electric field (E) versus current density (J) curves showed that the effect of Fe2O3 addition is to increase both the non-linear coefficient and the breakdown voltage. Variations in the potential barrier height were inferred from impedance spectroscopy (IS) analysis. Through transmission electron microscopy (TEM), the presence of precipitates of secondary phases was confirmed. Samples with precipitates displayed poor electrical properties. (c) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：737 / 742

页数：6

共 19 条

[1] Effect of Fe2O3 doping on the electrical properties of a SnO2 based varistor [J].