The Enhanced Diffusion of Oxygen in ZnO Varistor

Satoru FUJITSU; Hiroshi TOYODA; Hiroaki YANAGIDA

doi:10.2109/jcersj.96.119

Journal of the Ceramic Society of Japan

Online ISSN : 1882-1022
Print ISSN : 0914-5400
ISSN-L : 0914-5400

The Enhanced Diffusion of Oxygen in ZnO Varistor

Satoru FUJITSU, Hiroshi TOYODA, Hiroaki YANAGIDA

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Keywords: ZnO, Varistor, Oxygen diffusion, Second phase

JOURNAL FREE ACCESS

1988 Volume 96 Issue 1110 Pages 119-123

DOI https://doi.org/10.2109/jcersj.96.119

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Abstract

The varistor characteristic was found to be dependent on oxygen behavior. Characterization with SIMS and EPMA indicated that there existed a high diffusion path inside the sample. Enhancement of oxygen diffusion was considered to be due to the segregated second phase network composed of mainly Bi₂O₃ or Pr₆O₁₁. A model to explain the diffusion enhancement is proposed based on the results of the tracer ¹⁸O measurement.

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