A Study on Solid Reaction of BaCO3-TiO2 System

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J. Korean Ceram. Soc. > Volume 24(5); 1987 > Article

Journal of the Korean Ceramic Society 1987;24(5): 484.

BaCO3-TiO2계의 고상반응에 관한 연구

이응상, 황성연¹, 임대영

한양대학교 공과대학 무기재료공학과
¹한양여자 전문대학 도예과

A Study on Solid Reaction of BaCO3-TiO2 System

ABSTRACT

Diffusion coupling experiment was done to study expansion of body and soild reaction in BaCO3-TiO2 system. Specimen of BaCO3 and TiO2 was formed with Pt-mark's method. Each specimen was fired at interval of 25℃ from 900℃ to 1000℃ for 2hrs. After that, specimen was fixed with resin and polished. Product layers of specimen were observed with SEM and EDS. The result were following; 1. Diffusion component is Ba2+, which diffuse toward TiO2. 2. Large crack between layer of BaCO3 and Ba2TiO4 was generated because of difference of thermal expansion coefficient. 3. Ba2TiO4 is formed to TiO2 body by the reaction of BaTiO3 and BaO and its structure is very porous. 4. BaTiO3 changes immediately to Ba2TiO4 by the reaction of BaO. But BaTiO3 which formed by the reaction of TiO2 and Ba2TiO4 exsists as layer because the diffusion distance of Ba2+ is far.