Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrical and Dielectric Characteristics of Zn-Pr-Co-Er-M(M=Ni, Mg, Cr) Oxides-Based Varistors

Zn-Pr-Co-Er-M(M=Ni, Mg, Cr)산화물계 바리스터의 전기적, 유전적 특성

  • 남춘우 (동의대학교 전기공학과) ;
  • 김명준 (동의대학교 전기공학과)
  • Published : 2004.08.01
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Abstract

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.

다양한 금속산화물(NiO, MgO, Cr$_2$O$_3$) 첨가에 따른 ZnO 바리스터의 미세구조, 전기적, 유전적 특성을 조사하였다. 평균 결정립 크기는 NiO 첨가로 증가한 반면 Cr$_2$O$_3$ 첨가로 감소하였다 이로 인해 바리스터 전압은Cr$_2$O$_3$ 첨가시 더 높게 나타났다. 바리스터 가운데서 Cr$_2$O$_3$가 첨가된 바리스터가 비직선 지수가 40.5, 누설전류가 2.7 $\mu$A로 가장 우수한 비직선성을 나타내었으며, 유전손실도 0.0589로 비교적 낮게 나타났다.

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