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J. Korean Ceram. Soc. > Volume 23(4); 1986 > Article
Journal of the Korean Ceramic Society 1986;23(4): 41.
Barium Titanate를 고상반응으로 합성할 때 팽창에 영향을 주는 분위기조성에 관한 연구
이은상, 임대영
한양대학교 무기재료공학과
A Study on Atomosphere Sintering to affect the Abnormal Expansion in Solid-Solid Reaction of $BaTiO_3$
ABSTRACT
When barium titanate was synthesized in solid-solid reaction the abnormal expansion occurred from 90$0^{circ}C$ to 110$0^{circ}C$. The equi molecular mixture of $BaCo_3$ and $TiO_2$ was sintered from 90$0^{circ}C$ to 130$0^{circ}C$ on the condition of air vacuum and $CO_2$ atomosphere. After that the specimens were tested closely with XDR Dilatometer and SEM The result indicated that: 1, Volume expansion to be synthesized barium titanate in solid-solid reaction was affected by atomosphere sintering. 2. The solid reaction ot fiorm barium titanate in vacuum atomosphere occurred faster than that in air atomosphere. In vacuum atomosphere the maxium volume expansion was about 30% at 90$0^{circ}C$ for 2hrs, 3. The solid reaction to form barium titanate in 4CO_2$ atomosphere occurred slower than that in air atomosphere. In $CO_2$ atomosphere the maximum volume expansion was 13% at 100$0^{circ}C$ for 2 hrs. 4. According to the result of x-ray the expanison was caused by the reaction to form $BaTiO_3$ and change $Ba_2TiO_4$ into 4BaTiO_3$
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