The effects of additives on electrical degradation for ZnO varistors

被引：1

作者：

Ishikawa, T ^{[1
]}

Yoshikado, S ^{[1
]}

机构：

[1] Doshisha Univ, Dept Elect, Kyotanabe 6100321, Japan

来源：

ELECTROCERAMICS IN JAPAN IV | 2002年 / 216卷

关键词：

ZnO varistors; additives; electrical degradation; valence states; ICTS method; XPS method;

D O I：

10.4028/www.scientific.net/KEM.216.77

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 correlation between electrical characteristics and valences state of additives in the ZnO varistors were investigated by a V-I, an ICTS and an XPS measurements. It is found that Cr as additives had different contribution to nonlinear index alpha to Bi-Co or Bi-Mn added ZnO. Addition of V to Bi-Co or Bi-Mn added ZnO decreased alpha. Bi-Mn-Cr and Bi-Co-Cr added ZnO samples showed small ratio of the decrement of alpha after the electrical degradation. After electrical degradation, XPS spectra of Cr-2p(3/2) orbit for all samples added Cr showed the same binding energy. XPS spectra of V-2P(1/2) orbit for Bi-Mn-V added sample was shifted to high energy side about 1eV by the electrical degradation. In this case the alpha drastically decreased compared with that for Bi-Co-V added ZnO. These results show that the valence states for additives correlate to the alpha for ZnO varistors.

引用

页码：77 / 80

页数：4

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