Effect of partial substitution of Mg for Co in Mn1.4Ni1.2Co0.4O4NTC thermistors on electrical stability

被引：25

作者：

Park, K. ^{[1
]}

Han, I. H. ^{[1
]}

机构：

[1] Sejong Univ, Dept Adv Mat Engn, Seoul 143747, South Korea

来源：

JOURNAL OF ELECTROCERAMICS | 2006年 / 17卷 / 2-4期

关键词：

NTC thermistors; stability; microstructure; electrical resistivity; MgO; Mn(1.4)Ni(1.2)Co(0.4-x)Mg(x)O4;

D O I：

10.1007/s10832-006-0465-1

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：

Sintered Mn1.4Ni1.2Co0.4 - x MgxO4 (0 <= x <= 0.25) samples were thermal constrained by heating at 850 degrees C followed by air cooling. As-sintered and thermal constraint samples were composed of Mn- and Ni-rich phases with a cubic spinel structure. The substituted Mg suppressed the separation of Ni-rich phase in a Mn1.4Ni1.2Co0.4 - x MgxO4 solid solution and resulted in a more stable spinel structure. In particular, the substituted Mg led to a significant decrease in the resistance drift of the Mn1.4Ni1.2Co0.4 - x MgxO4 NTC thermistors after thermal constraint. This indicates that the Mg substituted Mn1.4Ni1.2Co0.4 - x MgxO4 NTC thermistors have good electrical stability in comparison with the Mg-free Mn1.4Ni1.2Co0.4O4 thermistors. We strongly recommended the substitution of Mg for Co in Mn-Ni-Co-O NTC thermistors for stabilizing their resistivity drift, i.e., ageing.

引用

页码：1079 / 1082

页数：4

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