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Electrical and Dielectric Properties of ZnO-Pr6O11 Varistors with Sintering Time

소결시간에 따른 ZnO-Pr6O11계 바리스터의 전기적, 유전적 특성

  • 남춘우 (동의대학교 전기공학과) ;
  • 박종아 (동의대학교 전기공학과) ;
  • 유대훈 (동의대학교 전기공학과)
  • Published : 2005.06.01

Abstract

The electrical and dielectric properties of $ZnO-Pr_6O_{11}-CoO-Cr_2O_3-based$ varistors were investigated in the sintering time range of $1\~3$ h. Increasing sintering time improved the densification of ceramics, whereas deteriorated the nonlinearity, in which the nonlinear exponent greatly decreased from 55.3 to 38.2 and the leakage current increased from 0.1 to $1.1\;{\mu}A$. The donor concentration and density of interface states increased in the range of $(1.06\~1.60)\times10^8/cm^3\;and\;(3.15\~3.67)\times10^{12}/cm^2$ with increasing sintering time, respectively. while, in dielectric properties, the increase of sintering time increased in the range of $0.0228\~0.0505$ in tans and $1.32\~1.36\;{\mu}s$ in relaxation time.

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