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Journal of Materials Science

, Volume 41, Issue 17, pp 5709–5711 | Cite as

A simple approach to oxide varistor materials

  • A. B. Glot
Letter

Non-Ohmic conduction is observed in many oxide ceramic semiconductor materials on the basis of ZnO [1], TiO2 [2] and SnO2 [3, 4]. These ceramics are used as varistors—semiconductor devices with nonlinear symmetric current-voltage characteristic (CVC). Varistor ceramics consist of highly conductive grains with grain-boundary potential barriers formed during sintering [1, 2, 3, 4, 5]. Non-Ohmic conduction in ZnO varistors is explained by thermionic emission enhanced by barrier lowering at low fields with a combination of other mechanisms at high fields [5, 6, 7, 8].

However, in spite of a deep understanding of varistor action [ 5, 6, 7, 8, 9, 10], there is no simple analytical expression of CVC related to the mechanism of non-Ohmic conduction. Instead of that the empirical power-law relation
$$ j = BE^\beta , $$

Keywords

SnO2 Co3O4 Barrier Height Bi2O3 Sb2O3 

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.División de Estudios de PosgradoUniversidad Tecnológica de la MixtecaOaxacaMéxico

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