Effects of Bismuth Sesquioxide on the Characteristics of ZnO Varistors |
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| Authors: | TAKETOSHI TAKEMURA MASAHIRO KOBAYASHI YOSHIO TAKADA KEN SATO |
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| Affiliation: | Mitsubishi Electric Corporation, Tsukaguchi-honmachi, Amagasaki 661, Japan |
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| Abstract: | The nonlinearity of ZnO varistors is significantly influenced by the Bi2O3 and Sb2O3 contents, as well as by the phase composition of the Bi2O3. Degradation of the current-voltage characteristics due to the applied voltage is not always lowered by the β—γ transition of the Bi2O3 phase. Lattice parameter determinations and stress analyses suggest that the Bi2O3-rich phase in multigrain junctions causes mechanical strain at the grain boundary which may play an important role in the current-voltage characteristics of ZnO varistors. |
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