Effect of MgO Content on Microstructural Evolution and Microwave Dielectric Properties of <TEX>$Ba(Mg_{1/3}Ta_{2/3})O_3$</TEX> Ceramics

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J. Korean Ceram. Soc. > Volume 31(11); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(11): 1299.

MgO 변화량에 다른 $Ba(Mg_{1/3}Ta_{2/3})O_3$ [BMT]계 세라믹스의 미세조직변화와 마이크로파 유전특성

이정아, 김정주, 이희영¹, 김태홍², 최태구²

경북대학교 무기재료공학과
¹영남대학교 무기재료공학과
²한국전자통신연구소 통신부품연구실

Effect of MgO Content on Microstructural Evolution and Microwave Dielectric Properties of $Ba(Mg_{1/3}Ta_{2/3})O_3$ Ceramics

ABSTRACT

Effect of MgO content on microstructural evolution and microwave dielectric properties of Ba(Mg1/3Ta2/3)O3 system was investigated. MgO content was varied from 10 mol% deficiency to 10 mol% excess of stoichiometric composition, respectively. It was found that MgO-deficient specimen showed faster grain growth rate than stoichometric and MgO excess BMT system. Besides, sandwich type precipitates of Ba5Ta4O15 which was formed within the BMT grain, might lead to the anisotropic grain growth of BMT grain. On the contrary, in MgO excess specimen, BMT grain growth rate was retarded by precipitations of MgO phase in grain boundary. Besides, the Q values of MgO-deficient showed lower than MgO-excess due to precipitations of Ba5Ta4O15 within BMT grain.