Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Microstructure and Electrical Properties of Zn-Pr-Co-Y-M(M=Ni, Mg, Cr) Oxide-Based Varistors

Zn-Pr-Co-Y-M(M=Ni, Mg, Cr) 산화물계 바리스터의 미세구조 및 전기적 특성

  • Nahm Choon-Woo (Department of Electrical Engineering, Dongeui University) ;
  • Park Jong-Ah (Department of Electrical Engineering, Dongeui University)
  • 남춘우 (동의대학교 전기공학과) ;
  • 박종아 (동의대학교 전기공학과)
  • Published : 2004.06.01
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Abstract

The microstructure and electrical properties of $ZnO-Pr_{6}$$O_{11}$ $-CoO-Y_2$$O_3$-based varistors were investigated with and without various metal oxide additives (NiO, MgO, and $Cr_2$$O_3$). The addition of NiO promoted the grain growth while that of Cr$_2$O$_3$ decreased average grain size. Thereby, the varistor voltage was higher in $Cr_2$$O_3$-added composition. Among $ZnO-Pr_{6}$ $O_{11}$ /$-CoO-Y_2$$O_3$-based varistors, the$ Cr_2$$O_3$-added varistor exhibited the highest nonlinear exponent (51.2), the lowest leakage current (1.3 $\mu$A), and the lowest dielectric dissipation factor (0.0433).

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References

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