A Study on the Dielectric Properties of <TEX>$SrTiO_3$</TEX>  Sintered Body Synthesized by Oxalate Method

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J. Korean Ceram. Soc. > Volume 28(3); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(3): 215.

수산염법으로 합성한 $SrTiO_3$ 소결체의 유전특성에 관한 연구

김병호, 이만규, 김석우

고려대학교

A Study on the Dielectric Properties of $SrTiO_3$ Sintered Body Synthesized by Oxalate Method

ABSTRACT

The synthesis of SrTiO3 powders having high purity and homogeneous submicron particle size was attempted by the oxalate method. The microstructure and dielectric properties of SrTiO3 based boundary layer capacitor (BLC) were investigated. Strontium titanyl oxalate[SrTiO(C2O4)2.4H2O] was prepared from the mixing solution of (Sr, Ti) using oxalic acid(H2C2O4) as a precipitating agent at 8$0^{circ}C$. The crystalline SrTiO3 powder was obtained by thermal decomposition of the precipitate above $600^{circ}C$. The crystalline SrTiO3 powder containing Nb2O5 as a dopant, TiO2 and SiO2 as additives was sintered at 1360~144$0^{circ}C$ in the reducing atmosphere to get semiconductive SrTiO3. Insulating material containing PbO-Bi2O3-B2O3 frit was printed on the sintered semiconductive SrTiO3 and fired at 120$0^{circ}C$ for 2h to get the grain boundary diffusion.