Origin of varistor properties of tungsten trioxide （WO3） ceramics

To study the physical origin of the non-ohmic behavior of WO3 ceramics,the effects of heat treatment in different atmospheres on WO3 varistors were investigated.Experiments showed that there was a dependence of the nonlinear coefficient on thermal treatment under different atmospheres.Thermal treatm...

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Bibliographic Details
Published in:Journal of semiconductors 2010 (2), p.1-4
Main Author: 赵洪旺 花中秋 李统业 王豫 赵勇
Format: Article
Language:Chinese
Subjects:
三氧化钨
压敏电阻器
性质
氧气气氛
热处理效果
起源
陶瓷
非线性系数
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Summary:To study the physical origin of the non-ohmic behavior of WO3 ceramics,the effects of heat treatment in different atmospheres on WO3 varistors were investigated.Experiments showed that there was a dependence of the nonlinear coefficient on thermal treatment under different atmospheres.Thermal treatments in argon and oxygen atmospheres at 900℃proved this dependence,and indicated that the nonlinear coefficient got significantly lower when the samples were thermally treated under argon atmosphere.Subsequent exposure to oxygen atmosphere at the same temperature led to the restoration of electrical properties.The result shows that the physical origin of the non-ohmic behavior of WO3 ceramics is oxygen on the grain surfaces adsorbed by intrinsic defects.
ISSN:1674-4926