The Role of Calcium as a Reduction Inhibitor in <TEX>$BaTiO_3$</TEX>

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 27(6); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(6): 741.

Ca 첨가에 의한 $BaTiO_3$의 환원억제기구

황연, 김윤호, 박순자¹

한국과학기술연구원 정밀요업실
¹서울대학교 무기재료공학과

The Role of Calcium as a Reduction Inhibitor in $BaTiO_3$

ABSTRACT

Dielectrics which do not lose their high insulation resistance in reducing atmosphere are necessary for multilayer ceramic capacitors with Ni internal electrode. In this study we investigated the Ca ion site occupancy in A-site excess Ca-doped BaTiO3 by measuring the insulation resistance, lattice constant and Curie temperature. Its Curie temperature, which was lower than that of the pure BaTiO3, was more lowered by sintering in reducing atmosphere. Lattice constnat of c-axis decreased and that of a-axis increased, suggesting substitution of Ca ions for Ti ions. Hence CaTi" acts as an acceptor to maintain high insulation resistance.ance.