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J. Korean Ceram. Soc. > Volume 25(6); 1988 > Article
Journal of the Korean Ceramic Society 1988;25(6): 671.
공침법에 의한 Ba2Ti9O20의 합성
이경희, 이병하, 오권오
명지대학교 공과대학 무기재료공학과
Preparation of Ba2Ti9O20 by Coprecipitation Method
Preparation of high purity ultrafine Ba2Ti9O20 powder was investigated by coprecipitation method. Formation of Ba2Ti9O20 powder from precipitate of coprecipitation takes place at 120$0^{circ}C$, which is 20$0^{circ}C$ lower than that from mechanical mixtures of BaCO3 and TiO2. This is apparently due to the nature of the compounds formed by the reaction of mixtures of aqueous solutions of BaCl2 and TiCl4 with an ammoniacal solution of ammonium carbonate and ammouium hydroxide. In this method, the Ba2Ti9O20 powders show low callcining and sintering temperature and it has good sintering and dielectric constant at room temperature.
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