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A Study on the Improvement of the Electrical Stability Versus MgO Additive for ZnO Ceramic Varistors

MgO 첨가에 따른 ZnO 세라믹 바리스터의 안정성 향상에 관한 연구

  • 소순진 (원광대학교 대학원 전자재료공학과) ;
  • 김영진 (삼례공업고등학교 전자통신과 교사) ;
  • 박춘배 (원광대학교 전기전자 및 정보공학부)
  • Published : 2002.05.01

Abstract

The degradation characteristics of MgO additive for the ZnO ceramic devices fabricated by the standard ceramic techniques are investigated in this study. These devices were made from basic Matsuoka's composition. Especially, MgO was added to analyze the degradation characteristics and devices were sintered in air at $1200^{\circ}C$. The conditions of DC degradation test were $115\pm2^{\circ}C$ for 12h. Using XRD and SEM, the phase and microstructure of samples were analyzed, respectively. The elemental analysis in the microstructures was performed by EDS, E-J analysis was used to determine $\alpha$. Frequency analysis was accomplished to understand the relationship between $R_G$ and $R_B$ with the electric stress at the equivalent circuit.

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