Characteristics of ZnO Varistors Prepared by Organiz Process

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J. Korean Ceram. Soc. > Volume 29(4); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(4): 253.

유기화학적 방법에 의한 제조된 ZnO 바리스터의 특성

안충선, 심영재, 조성걸¹, 조병두

경상대학교 무기재료공학과
¹경상대학교 전자재료공학과

Characteristics of ZnO Varistors Prepared by Organiz Process

ABSTRACT

ZnO varistors were prepared by the organochemical method which used citric acid and ethylene glycol as gelling agents. The microstructure of the sintered specimens exhibited small grains, uniform grain size distribution, and few intragranular pores. Thermal decomposition of the organic resin formed during the powder preparation process was completed around 450$^{circ}C$. No significant changes were observed in microstructure and current voltage characteristic with respect to calcination temperatures. A major advantage of the organochemical method used in this experiment is a possible uniform mixing of trace amounts of dopants. Therefore, this powder preparation method seems promising in investigating the effect of Li or In ion, which is added in ppm level to ZnO varistors, on the pulse respose characteristic.