Electrical Properties of Zinc Oxide Varistor with <TEX>$alpha-Zn_7Sb_2O_{12}$</TEX>

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J. Korean Ceram. Soc. > Volume 31(11); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(11): 1396.

$alpha-Zn_7Sb_2O_{12}$ 첨가에 의한 Zinc Oxide 바리스터의 전기적 특성

김경남, 한상목

강원대학교 재료공학과

Electrical Properties of Zinc Oxide Varistor with $alpha-Zn_7Sb_2O_{12}$

ABSTRACT

Electrical properties in the ZnO-Bi2O3-CoO-Zn7Sb2O12 system were investigated with Zn7Sb2O12 content (0.1~2 mol%). The increase of the Zn7Sb2O12 content inhibited the grain growth of ZnO, which showed a narrow grain size distribution of ZnO. The breakdown voltage (Vb) increased markedly with 1 mol% Zn7Sb2O12 addition due to the grain growth control behaviour of the Zn7Sb2O12 . The nonlinear I-V characteristic was significantly influenced by the Zn7Sb2O12 content (or Bi2O3/Zn7Sb2O12 ratio). Addition of 0.5 mol% Zn7Sb2O12 showed the highest nonlinear coefficient ($alpha$) of 43. The leakage current in prebreakdown region was decreased with increasing Zn7Sb2O12 content.