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J. Korean Ceram. Soc. > Volume 26(3); 1989 > Article
Journal of the Korean Ceramic Society 1989;26(3): 395.
Oxalate공침법에 의한 고온 초전도체 YBa2Cu3O7-$delta$의 합성 II. Cu2+-Oxalate-Complex가 Y3+ 및 Ba2+의 용해도에 미치는 영향
최진호, 김배환, 최규원
서울대학교 자연과학대학 화학과
Synthesis of High Tc Superconductor YBa2Cu3O7-$delta$ by Oxalate Coprecipitation Method II. The Effect of Cu2+-Oxalate-Complex Formation for the Solubilities of Y3+ and Ba2+
ABSTRACT
The concentrations of Cu(II), Y(III) and Ba(II) ionic species in aqueous solution due to the formation of Cu2+-oxalate-complex have been theoretically calculated with respect to pH and their solubility diagrams could be obtained. It was verified from the calculation that the excess of Cu2+ and Ba2+ should be added in order to obtain oxalate coprecipitates with the molar ratio of Y : Ba : Cu=1 : 2 : 3. The exact amount of excess species has been calculated with respect to the initial concentrations of metal ions and pH.
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