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J. Korean Ceram. Soc. > Volume 31(12); 1994 > Article
Journal of the Korean Ceramic Society 1994;31(12): 1561.
하소온도의 변화에 따른 $Ba(Mg_{1/3}Ta_{2/3})O_3$계 세라믹스의 소결 거동과 마이크로파 유전특성
이정아, 김정주, 이희영1, 김태홍2, 최태구2
경북대학교 무기재료공학과
1영남대학교 무기재료공학과
2한국전자통신연구소 통신부품 연구실
Effect of Calcining Temperature on the Sintering Behaviors and Microwave Dielectric Properties of $Ba(Mg_{1/3}Ta_{2/3})O_3$ Ceramics
ABSTRACT
Effect of calcining temperature on the sintering behaviors and microwave dielectric properties of BMT[Ba(Mg1/3Ta2/3)O3] ceramics was studied. The calcining temperatures were varied from 80$0^{circ}C$ to 130$0^{circ}C$, respectively. It was found that, as calcining temperature lowered below 125$0^{circ}C$, second phase such as Ba5Ta4O15 phases started to appear in calcined powder with unreacted powders. After sintering, exaggerately grown Ba5TaO3 phase could be found amang the uniform BMT grains in sintered body. Basis on the infiltration experiment, Ba0.05TaO3 phase should be formed by reaction of BMT grain and BaO-MgO eutectic liquid. But increase of calcining temperature above 125$0^{circ}C$, there was not any second phase or unreated component in calcined powder and sintered body. As result, low calcining temperature led to precipitation of second phase in specimen and resulted decrease of Q value of BMT ceramics.
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