Dependence of the nonlinear electrical behavior of SnO2-based varistors on Cr2O3 addition

被引：21
|
作者：
Filho, F. M.
Simoes, A. Z.
Ries, A.
Perazolli, L.
Longo, E.
Varela, J. A.
机构：
[1] UNESP, Dept Phys Chem, Inst Chem, BR-14801970 Araraquara, SP, Brazil
[2] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP, Brazil
来源：
CERAMICS INTERNATIONAL | 2007年 / 33卷 / 02期
基金：
巴西圣保罗研究基金会;
关键词：
varistors; tin dioxide; impedance spectroscopy;
D O I：
10.1016/j.ceramint.2005.07.025
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：
Tin dioxide varistors doped with Coo, ZnO, Ta2O5 and Cr2O3 were prepared by the mixed oxide method. Temperature dependent impedance spectroscopy revealed two different activation energies, one at low frequencies and the other at high frequencies. These activation energies were associated with the adsorption and reaction of O-2 species at the grain boundary interface. We show that Cr2O3 improves the varistor properties, generating sites for the adsorption of O' and O" at the grain boundary region. The O' and O" defects are truly responsible for the barrier formation at the grain boundary interface. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：187 / 192
页数：6
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