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


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.


  1. J. Am. Ceram. Soc. v.73 no.7 Application of zinc oxide varistor T. K. Gupta
  2. J. Korean. Phys. Soc. v.38 no.4 Analysis of the degradation characteristics using EPMA and the ambient sintering process in semiconducting ZnO ceramic varistors S. J. So;C. B. Park
  3. Materials Lett. v.47 The nonlinear properties and stability of ZnO Pr6O11 CoO Cr₂O₃Er₂O₃ceramic varistors C.W.Nahm
  4. J. Appl. Phys v.81 Microstructural origin of current localization and puncture "failure" in varistor ceramics A. Vojta;D. R. Clarke
  5. J. Am. Ceram. Soc. v.82 no.3 Varistor ceramics D. R. Clarke
  6. 전기전자재료학회논문지 v.13 no.5 분위기 소결공정에 의해 제조된 ZnO 세라믹 바리스터의 열화기구 연구 소순진;김영진;박춘배
  7. J. Euro. Ceram. Soc. v.17 Effect of annealing on phase structure and degradation of zinc oxide varistor with Si additive H. Q. Shao;X. H. Gao;Z. C. Cao
  8. 전기전자재료학회지 v.11 no.7 피뢰기 소자(ZnO)의 열화원인 분석 김찬영;송일근;김주용
  9. J. Appl. Phys. v.77 no.9 The roles played by Ag and AI dopants in controlling the electrical properties of ZnO varistors J. F.;R. Freer