Effects of Calcination Process and <TEX>$ZrO_2$</TEX> Addition on the Electrical Properties of <TEX>$BaTiO_3$</TEX> Ceramics

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J. Korean Ceram. Soc. > Volume 28(11); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(11): 935.

하소공정과 $ZrO_2$ 첨가량이 $BaTiO_3$의 전기적 특성에 미치는 영향

차진이, 박재관, 오태성, 김윤호

한국과학기술연구원 정밀요업연구실

Effects of Calcination Process and $ZrO_2$ Addition on the Electrical Properties of $BaTiO_3$ Ceramics

ABSTRACT

Effects of calcination process and ZrO2 addition on the electrical properties of [(Ba0.82Sr0.08Ca0.1)O]m(Ti1-$chi$Zr$chi$)O2 ceramics have been investigated. With the variation of A/B-site ratio m of the dielectric formulations, sintering behavior and the resistivity after sintering in a reducing atmosphere have been affected by the calcination process. When the dielectric formulations of m=1.01 were sintered in a reducing atmosphere, the room-temperature resitivity of 109 {{{{ OMEGA }}.cm was obtained for samples processed with two-step calcination, which was much lower than 1012 {{{{ OMEGA }}.cm of samples calcined once. It was confirmed that high resistivity of Ca-doped BaTiO3 ceramics, after sintering in a reducing atmosphere, is maintained by acceptor-like behavior of CaTi" which is formed by Ca substitution to Ti-site. It was also found out that the critical amount of B-site Ca substitution for reduction inhibition of BaTiO3 is around 0.005 mol. With the increasing amount of ZrO2 addition to dielectric formulations, Curie peak was depressed and Curie temperature was lowered due to the enhanced diffuse phase transition.tion.