J. Korean Ceram. Soc. > Volume 40(10); 2003 > Article
 Journal of the Korean Ceramic Society 2003;40(10): 943. doi: https://doi.org/10.4191/kcers.2003.40.10.943
 Zn-Pr-Co-Cr-Dy 산화물계 바리스터의 전기적, 유전적 특성 남춘우, 박종아, 김명준, 류정선1 동의대학교 전기공학과1동의대학교 전자세라믹스센터 Electrical and Dielectric Properties of Zn-Pr-Co-Cr-Dy Oxides-based Varistors ABSTRACT The microstructure and electrical characteristics of Zn-Pr-Co-Cr-Dy oxides-based varistors were investigated with Dy$_2$ $O_3$ content in the range of 0.0∼2.0 ㏖%. As Dy$_2$ $O_3$ content is increased, the average grain size was decreased in the range of 18.2∼4.6 $mutextrm{m}$ and the ceramic density was decreased in the range of 5.49∼4.64 g/㎤. The incorporation of Dy$_2$ $O_3$ markedly enhanced the nonlinear properties of varistors more than 9 times in nonlinear exponent, compared with the varistor without Dy$_2$ $O_3$ The varistor with 0.5∼1.0 ㏖% Dy$_2$ $O_3$ exhibited the high nonlinearity, in which the nonlinear exponent is above 55 and the leakage current is below 1.0 ${mu}textrm{A}$. The donor concentration and the density of interface states were decreased in the range of (4.66∼0.25)${times}$10$^$18//㎤ and (5.70∼1.39)${times}$10$^$12//$textrm{cm}^2$, respectively, with increasing Dy$_2$ $O_3$ content. The minimum dielectric dissipation factor of 0.0023 was obtained for 0.5 ㏖% Dy$_2$ $O_3$, but further addition of Dy$_2$ $O_3$ increased it. Key words: Zn-Pr-Co-Cr-Dy oxides-based varistors, Electrical characteristics, Nonlinearity, Dielectric dissipation factor
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