Synthesis of High Tc Superconductor YBa2Cu3O7-<TEX>$delta$</TEX> by Oxalate Coprecipitation Method I. Theoretical Considerations based on Analytical Chemistry

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J. Korean Ceram. Soc. > Volume 26(1); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(1): 91.

옥살레이트 공침전법에 의한 고온 초전도체 YBa2Cu3O7-$delta$의 합성 I. 분석화학적 측면의 이론적 고찰

김배환, 김배연¹, 김창은¹, 최진호

서울대학교 자연대학 화학과
¹연세대학교 공과대학 요업공학과

Synthesis of High Tc Superconductor YBa2Cu3O7-$delta$ by Oxalate Coprecipitation Method I. Theoretical Considerations based on Analytical Chemistry

ABSTRACT

The concentrations of hydroxide, carbonate and oxalate for Y(III), Ba(II) and Cu(II) ions in an aqueous solution have been theoretically calcuated with respect to pH and their solubility diagram could be obtained. The optimum pH ofr oxalate coprecipitates at room temperature was estimated as<4, which was not influenced by carbonates and hydroxides in H2O solvent. The yield is dependent on the concentration of added oxalic acid, but the concentration of oxalic acid was fixed as 0.1M in this calculation for simplicity.