Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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Barrier formation of single junctions with oxidation in SrCoO3-doped ZnO varistors sintered in a reducing atmosphere
Yoshiko HIGASHIEiichi KOGA
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2019 Volume 127 Issue 12 Pages 912-917

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Abstract

Nonlinear electrical properties of individual grain boundaries in SrCoO3-doped ZnO varistor ceramics are investigated using a nano-prober system. In particular, the effect of post-annealing is clarified for them after sintering in a reducing atmosphere. The nonlinear characteristics are enhanced by annealing in air at above 600°C. The resulting characteristics are attributed to an increase of p-type carrier concentration in SrCoO3 phase at grain boundaries. By annealing at a higher temperature (e.g., 800°C), the grain boundaries possess nonlinear characteristics similar to conventional Bi-doped ZnO varistors, as well as bulk-bodies.

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© 2019 The Ceramic Society of Japan
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