Electrical and Dielectric Characteristics of Zn-Pr-Co-Dy-M(M=Ni, Mg, Cr) Oxides-Based Varistors

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

  • 남춘우 (동의대학교 전기공학과) ;
  • 박종아 (동의대학교 전기공학과)
  • Published : 2004.09.01


The microstructure, electrical and dielectric characteristics of $ZnO-{Pr}_6{O}_11-{CoO}-{Dy}_2{O}_3$-based varistors were investigated without and with various metal oxide additives(NiO, MgO, Cr$_2$O$_3$). The average grain size decreased in the range of 18.4 $\backsim$ 11.5 $\mu$m, in order of NiO\longrightarrowMgO\longrightarrow{Cr}_2{O}_3$ and the density decreased in the range of 5.62 \backsim 5.33 $g/{cm}^3$ in order of NiO\longrightarrowCr$_2$O$_3$\longrightarrowMgO. While, the nonlinear exponent increased In the range of 19.8$\backsim$67.4 in order of NiO\longrightarrowMgO\longrightarrow${Cr}_2{O}_3$ and the leakage current decreased in the range of 25.6 $\backsim$ 1.2 $\mu$A in order of NiO\longrightarrow${Cr}_2{O}_3$\longrightarrowMgO. Among all varistors, the Cr$_2$O$_3$-added varistor exhibited the highest nonlinearity, with a nonlinear exponent of 67.4 and a leakage current of 1.2 $\mu$A. Furthermore, this varistor exhibited the lowest dielectric dissipation factor of 0.0407.


  1. 半導體 セラミ クスと その應用 ニュ- ケラスシ-リズ 編集委員會
  2. 電氣學會技術報告 no.474 酸化亞鉛 避雷器の特性と評價試驗法 電氣學會
  3. 電子セラミクス ノ瀨 昇
  4. Ceram. Bull v.66 Zinc oxide varistros with praseodymium oxide K. Mukae
  5. J. Appl. Phys. v.70 no.11 The effect of liquid-phase sintering on the properties of $Pr^6O^{11}$-based ZnO varistors A. B. Alles;V. L. Burdick
  6. J. Amer. Ceram. Soc. v.76 no.8 Compositional effects on the liquid-phase sinering of praseodymium oxides-based zinc oxides varistors A. B. Alles;R. Puskas;G. Callahan;V. L. Burdick
  7. J. Amer. Ceram. Soc. v.79 no.9 Microstructure and crystal phases of prase-odymium in zinc oxide varistor ceramics Y. S. Lee;K. S. Liao;T. Y. Tseng
  8. J. Electroceram. v.4 no.S1 Magnatization and electric properties of Pr-doped ZnO N. Ohashi;S. Mitarai;O. Fukunaga
  9. Mater. Sci. and Engin. v.B79 no.1 Mass transport via grain boundary in Pr-based ZnO varistors and related electrical effects S. Y. Chun;N. Mizutani
  10. 전기전자재료학회논문지 v.13 no.5 Dy₂O₃가 첨가된 $Pr_6O_{11}$계 ZnO 바리스터의 전기적 성질 및 안정성 남춘우;윤한수
  11. 전기전자재료학회논문지 v.15 no.10 ZPCD계 바리스터 세라믹스의 전기적 특성에$Pr_6O_{11}$/CoO 비의 영향 남춘우;김향숙
  12. 전기전자재료학회논문지 v.16 no.1 Sm₂O₃가 첨가된 ZnO-$Pr_6O_{11}$-CoO계 세라믹스의 ZNR 특성 남춘우
  13. Mater. Lett. v.19 no.9 Highly stable monohmic characteristics of ZnO-$Pr_6O_{11}$-CoO-Dy₂O₃ based varistors C. W. Nahm;C. H. Park;H. S. Yoon
  14. J. Eur. Ceram. Soc. v.21 The electrical properties and d.c. degradation characteristics of Dy₂O₃ doped $Pr_6O_{11}$-based ZnO varistors C. W. Nahm
  15. J. Mater. Sci. v.21 Effect of $Er_2O_3$ addition on the microstructure and electrical properties and stability of $Pr_6O_{11}$-based ZnO ceramic varistors C. W. Nahm;C. H. Park,
  16. Mater. Lett. v.56 no.4 Effect of $Pr_6O_{11}$/CoO mole ratio on nonlinear properties and DC accelerated aging characteristics of ZnO-$Pr_6O_{11}$-CoO-$Dy_2O_3$ based varistors C. W. Nahm;H. S. Kim
  17. Mater. Lett. v.57 no.9-10 Influence of cooling rate on stability of nonlinear properties of ZnO-$Pr_6O_{11}$-based varistors ceramics C. W. Nahm;H. S. Kim
  18. Mater. Chem. and Phys. v.80 no.3 Influence of praseodymium oxide/cobalt oxide ratio on electrical properties of zinc oxide varistor ceramics C. W. Nahm
  19. J. Amer. Ceram. Soc. v.97 no.12 Lineal intercept technique for measuring grain size in two-phase polycrystalline ceramics J. C. Wurst;J. A. Nelson