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J. Korean Ceram. Soc. > Volume 37(4); 2000 > Article
Journal of the Korean Ceramic Society 2000;37(4): 338.
표면 코팅된 분말을 이용하여 제조된 반도성 $BaTiO_3$ 소결체의 입계 화학 및 전기적 특성
박명범, 김정돈1, 조남희
인하대학교 재료공학부
1한국과학기술연구원 세라믹스연구부
Electrical and Chemical Characteristics of the Grain Boundaries of Semiconducting $BaTiO_3$ Ceramics Prepared with Surface-Coated Powders
ABSTRACT
Grain boundary chemistry and electrical characteristics of polycrystalline BaTiO3 ceramics, which were prepared with sol-gel surface-coated semiconducting powders, were investigated. Mn ions were coated on the powder surface by sol-gel coating-techniques. The additives coated on the surface of the powders were observed to be present near the grain boundaries of the ceramics. The ceramics exhibit the PTCR characteristics with a resistivity jump ratio(Pmax/Pmin) of about 2$times$103. With raising the temperature from room temprature to 20$0^{circ}C$, the oxidation state of the Mn ions varied from Mn3+ to Mn2+ in the coating layers. Near the grain boundaries an excessive negative charge layer of about 20nm was formed.
Key words: $BaTiO_3$, MnOx, PTCR, Grian boundary, Sol-gel, Oxidation state
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