Analysis of secondary phases segregated and precipitated in SnO2-based varistors

被引：18

作者：

Parra, R

Castro, MS

Varela, JA

机构：

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

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

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2005年 / 25卷 / 04期

基金：

巴西圣保罗研究基金会;

关键词：

electron microscopy; grain boundaries; microstructure-final; varistors; SnO2;

D O I：

10.1016/j.jeurceramsoc.2004.02.010

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：

Transmission and scanning electron microscopy techniques were used to study the heterogeneities found in the microstructure of (SnO2Co3O4Nb2O5Fe2O3)-Co-.-Nb-.-Fe-. and (SnO2ZnONb2O5FC2O3)-Zn-.-Nb-.-F-. varistors. Second phases encountered both inside the grains and ingrain boundary regions were identified using energy dispersive spectrometry and electron diffraction patterns. Through the electrical characterisation, the presence of iron oxide among the additives was determined to highlight the non-linear properties of the specimens. A discussion on the influence of second phases on the non-linear features of these systems is also addressed. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：401 / 406

页数：6

共 14 条

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