Preparation of High Purity <TEX>$SrTiO_3$</TEX> by Coprecipitation and Strontium Titanyl Oxalates

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J. Korean Ceram. Soc. > Volume 20(2); 1983 > Article

Journal of the Korean Ceramic Society 1983;20(2): 107.

공심법과 (Sr-Ti)수산염에 의한 고순도의 $SrTiO_3$ 합성에 관한 연구

이종권, 이병하¹

한양대학교
¹한양대교

Preparation of High Purity $SrTiO_3$ by Coprecipitation and Strontium Titanyl Oxalates

ABSTRACT

Formation of Strontium titanate from the products of coprecipitation takes place at 110$0^{circ}C$ which is 200-30$0^{circ}C$ lower than that from mechanical mixtures of $SrCO_3$ and $TiO_2$. This is apparently due to the nature of the compounds formed by the reaction of mixtures of aqueous solutions of $SrCl_2$ and $TiCl_4$ with an ammoniacal solution of ammoni-um carbonate and ammonium hydroxide. A procedure is described for preparing strontium titanyl oxalate tetrahydrate in the several mole ratio of $TiCl_4$ to $SrCl_2$. STrontium titanyl oxalates decompose to titanate at elevated temperature. The coprecipitates and the fired specimen were subjected to examined thermal and X-ray analyses and microstruc-ture by SEM.