Grain Size and Thickness Effects of Electrical Breakdown Behavior of <TEX>$BaTiO_3$</TEX> Ceramics

,; ,; ,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 33(11); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(11): 1217.

$BaTiO_3$ 세라믹스의 절연파괴거동에 미치는 결정립 크기와 시편두께의 영향

조경호, 남효덕, 박철우¹, 이희영¹

영남대학교 전자공학과
¹무기재료공학과

Grain Size and Thickness Effects of Electrical Breakdown Behavior of $BaTiO_3$ Ceramics

ABSTRACT

Undoped barium titanate ceramic samples with high density were produced by using both high purity hydro-thermally synthesized and oxalate-derived powders. Sintering temperature was varied in the temperature range 128$0^{circ}C$-140$0^{circ}C$ to control the average grain sizes of the samples. Electrical breakdown test was performed at two different temperature with 3$0^{circ}C$(below Tc) and 15$0^{circ}C$ (above Tc) for samples immersed in silicon oil bath using 60kV dc power supply. From the experimental results at below and above Curie temperature the grain size and thickness dependence of electrical breakdown strength for BaTiO3 ceramics was presented and breakdown behavior was also studied.

Key words: Electrical breakdown, Grain size, Intergranular breakdown, Transgranular, breakdown