Effect of additives on the electrical properties of a (Ba0.92Sr0.08)TiO3-based positive temperature coefficient resistor

被引:35
作者
He, ZM
Ma, J
Qu, YF
Feng, XM
机构
[1] Nanyang Technol Univ, Sch Mat Engn, Singapore 639798, Singapore
[2] Tianjin Univ, Mat Inst, Tianjin 300072, Peoples R China
关键词
BN; electrical conductivity; electrical properties; (Ba; Sr)TiO3-based; PTC devices;
D O I
10.1016/S0955-2219(01)00538-6
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
In the present work, the effects of the additives (BN, Y2O3 + Nb2O5, Sb2O3 + Nb2O5, and Cr) on the electrical properties of (Ba0.92Sr0.08)TiO3-based positive temperature coefficient resistor (PTCR) were investigated. It was noted that the addition of BN lowered the sintering temperature of the material system studied. A proper amount of BN could enhance the PTC effect, but the room-temperature resistivity would increase with increasing the content of BN, The addition of double donor Sb2O3 + Nb2O5 could lead to a lower room-temperature resistivity than that Of Y2O3 + Nb2O5. Metal Cr was also added to further reduce the resistivity. The low room-temperature resistivity and PTC behavior was achieved by controlling both the metallic Cr content and the process of reducing sintering and oxidation treatment. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2143 / 2148
页数:6
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