Somteromg Behavior and Electrical Characteristics of ZnO Variators Prepared by Pechini Process

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J. Korean Ceram. Soc. > Volume 35(5); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(5): 498.

Pechini 방법으로 제조된 ZnO 바리스터의 소결 거동 및 전기적 특성

윤상원, 심영재, 조성걸¹

경상대학교 공과대학 무기재료공학과
¹경상대학교 공과대학 전자재료공학과

Somteromg Behavior and Electrical Characteristics of ZnO Variators Prepared by Pechini Process

ABSTRACT

tion of 98.0 mol% ZnO 1.0 mol% $Bi_2O_3$ 0.5 mol% $MnO_2$ were prepared by the Pechini process and the sintering behavior and electrical characteristics were studied. ZnO varis-색 powder with $1.5mutextrm{m}$ mean diameter and narow particle size distribution was obtained using the Pechni pro-cess. Typical intermediate stage grain growth of liquid phase sintering was observed by sintering at $1100^{circ}C$ At this temperature ZnO varistors having uniform grain size and Bi-rich liquid phase distributed uniformly along grain boundaries were prepared. The nonlinear coefficients of the ZnO varistors were in the range of 40-60 The breakdown voltages of the varistors were nearly inversely propeortional to the grain size which reflects that ZnO varistors prepared by the Pechini process have uniform distribution of Bi-rich liquid phase along grain boundaries It is believed that the microstructures of ZnO varistors can be controlled effectively by using the Pechini process which makes the control of the electrical properties of ZnO varistors possible.

Key words: ZnO varistor, Pechini process, Grain size, Grain growth