Varistor behavior study in undoped tungsten trioxide ceramic

In this paper, varistor property and mechanism of undoped tungsten trioxide (WO 3) ceramic have been studied. Experimental results revealed that pure WO 3 ceramic could exhibit a nonohmic behavior which was formed in the cooling process of ceramic, and very sensitive to heat treatment in different a...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2011-07, Vol.406 (14), p.2807-2810
Main Authors: Hua, Zhongqiu, Dong, Liang, Wang, Haiqing, Peng, Shujie, Wang, Yu
Format: Article
Language:English
Subjects:
Ceramics
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Electronic devices
Electronic transport in condensed matter
Exact sciences and technology
Grain boundaries
Heat treatment
Low-field transport and mobility
piezoresistance
Oxygen adsorption
Physics
Potential barriers
Tungsten
Tungsten oxides
Varistor behavior
Varistors
WO 3
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Summary:In this paper, varistor property and mechanism of undoped tungsten trioxide (WO 3) ceramic have been studied. Experimental results revealed that pure WO 3 ceramic could exhibit a nonohmic behavior which was formed in the cooling process of ceramic, and very sensitive to heat treatment in different atmospheres. By comparison with the reported SnO 2 and ZnO varistor systems, it is supposed that the surface of WO 3 grain is more ready to adsorb oxygen and form high enough barriers at grain boundaries responsible for varistor behavior. The influences of heat treatments on the varistor properties of WO 3 ceramic have been investigated.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2011.04.033