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J. Korean Ceram. Soc. > Volume 41(8); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(8): 605.
doi: https://doi.org/10.4191/kcers.2004.41.8.605
Zn-Pr-Co-Er-M(M=Ni, Mg, Cr)산화물계 바리스터의 전기적, 유전적 특성
남춘우, 김명준
동의대학교 전기공학과
Electrical and Dielectric Characteristics of Zn-Pr-Co-Er-M(M=Ni, Mg, Cr) Oxides-Based Varistors
The microstructure, electrical and dielectric characteristics of ZnO varistors were investigated at various metal oxide (NiO, MgO, and Cr$_2$O$_3$) additives. The average grain size was increased with addition of NiO while that was decreased with addition of Cr$_2$O$_3$-Thereby, the varistor voltage was higher in Cr$_2$O$_3$-added composition. Among varistors, the varistor added with Cr$_2$O$_3$ exhibited the highest nonlinearity, with 40.5 in the nonlinear exponent and 2.7 ${mu}$A in the leakage current and its dielectric dissipation factor was relatively low value of 0.0589.
Key words: Microstructure, Nonlinear exponent, Nonlinearity, Leakage current, Dielectric dissipation factor
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