Effects of Antimony Oxide 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 breakdown voltage, the upturn voltage, and the nonlinearity of the ZnO varistors are significantly influenced by the Sb2O3 and SiO2 contents, as well as by the β→γ transition of the Bi2O3 phase. The lattice parameter of spinel is influenced by the coexisting Bi2O3 phase. Antimony oxide disperses into the powders of ZnO and other additives in the early stage of sintering, and finally gathers again as particles of spinel which may play an important role in the improvement of the nonlinearity by stressing the interfaces of two ZnO grains. |
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