Synthesis of <TEX>$BaTi_4O_9, Ba_2Ti_9O_{20}$</TEX> and <TEX>$BaTi_5O_{11}$</TEX> Compounds by Coprecipitation Method and Their Electrical and Thermal Properties

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J. Korean Ceram. Soc. > Volume 31(9); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(9): 1005.

공침법에 의한 $BaTi_4O_9, Ba_2Ti_9O_{20}$ 및 $BaTi_5O_{11}$화합물의 합성 및 그의 전기적, 열적 특성

김종옥, 손우창¹, 전성용¹, 이경희¹, 이병하¹

배재대학교 공과대학 무기재료공학과
¹명지대학교 공과대학 무기재료공학과

Synthesis of $BaTi_4O_9, Ba_2Ti_9O_{20}$ and $BaTi_5O_{11}$ Compounds by Coprecipitation Method and Their Electrical and Thermal Properties

ABSTRACT

The three different composition of BaTi4O9, Ba2Ti9O20 and BaTi5O11 were prepared by coprecipitation process, and then the dielectric properties of these compounds were measured at low microwave frequencies. The powder showing high level of purity was synthesised by the coprecipition reaction of BaCl2 and TiCl4 where (NH4)2CO3 and NH4OH were used as a deflocculent. Followings are the result of this study: 1. The sintering temperature increased with increasing TiO2 content. 2. BaTi4O9 powder were synthesized as a single phase by this processing technique, but the resultant Ba2Ti9O20 and BaTi5O11 phase existed with Ba2Ti9O20 and BaTi5O11 phases. 3. Single phase BaTi4O9 showed high dielectric constant value of 35, high Q value of 8100.