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J. Korean Ceram. Soc. > Volume 27(1); 1990 > Article
Journal of the Korean Ceramic Society 1990;27(1): 7.
MnO2첨가가 Y2O3 doped BaTiO3 반도체 세라믹스의 소결 및 PTCR특성에 미치는 영향
이준형, 박금덕1, 김정주, 조상희
경북대학교 재료공학과
1경북대학교 전자공학과
Effect of MnO2 Addition on Sintering and PTCR Properties in Y2O3 doped BaTiO3 Semiconducting Ceramics
The influence of MnO2 on the sintering property and PTCR behavior of(Ba0.8Sr0.2)TiO2 has been investigated. And the densities, grain sizes and electrical resitivities of specimens were measured as a function of doping with Mn ion of varying concentration. The density and grain size of the sintered specimens were almost the same regardless of MnO2 addition up to 0.2mol% MnO2. But in the case of 0.25mol% MnO2 addition, abnormal grain growth was appeared. So the grain size distribution was wide and density decreased greatly. The room-temperature resistivity increased as Mn content increased and the temperature coefficient of resistivity was highest in the case of 0.15mol% MnO2 addition.
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