Influence of simultaneous addition of MnO2 and CoO on properties of SnO2-based ceramics

被引：11
作者：
Dibb, A
Tebcherani, SM
Lacerda, W
Santos, MRC
Cilense, M
Varela, JA
Longo, E
机构：
[1] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP, Brazil
[2] UNESP, Inst Chem, Dept Physicochem, BR-14801970 Araquara, SP, Brazil
来源：
MATERIALS LETTERS | 2000年 / 46卷 / 01期
基金：
巴西圣保罗研究基金会;
关键词：
tin dioxide; varistors; dense ceramics; breakdown electric fields;
D O I：
10.1016/S0167-577X(00)00139-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper reports on a study of the: effect of replacing CoO by MnO2 on the sintering and electrical propel-ties of the 98.95% SnO2 + (1 - x)% CoO + x% MnO2 + 0.05% Ta2O5 system. All the samples were compacted into pellets and sintered at 1300 degrees C for 1 h, when they reached densities of about 98% of the theoretical density. An X-ray diffraction (XRD) analysis showed no other detectable phases other than SnO2. Current-voltage characterization indicated varistor behavior in the systems. The non-linear coefficient (alpha) and breakdown electric field (Eb) increased as the amount of MnO2 was increased. The results are explained in terms of an electric barrier modification, due to the presence of adsorbed negative oxygen species at the grain boundary inter face. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：39 / 43
页数：5
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