Process for obtaining precursors for high critical temperature s

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k

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423593, 505738, C01B 1336, C01F 1102, C01G 302

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active

052062155

ABSTRACT:
A process for obtaining precursors for high critical temperature superconductor ceramics by precipitating salts which are insoluble in water comprises the following stages: A starting solution of soluble salts is prepared in which the cations are in the stoichiometric proportions of the required superconductor phase. A first full precipitation is carried out of a first series of cations at a first value of pH. The first precipitates obtained is filtered out and washed and the filtrate is retained. The pH of the filtrate is changed to a second value and the residual cations are precipitated. The second precipitate is filtered. The first and second precipitates are homogenized. The product obtained is dried, calcined, and ground.

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Japanese Journal of Applied Physics, vol. 26, No. 5, May 1987, Tokyo JP Keiji Kaneko: `On the Coprecipitation Method for the Preparation of High Tc M-X-Cu-O (M=Ba, Sr, X=La, Y) System`.
Physica C., vol. 157, No. 1, Jan. 1, 1989, Amsterdam, NL; Yu Zhang: "The Synthesis of Superconducting Bismuth Compounds via Oxalate Coprecipitation".
Chemical Abstracts, vol. 113, No. 12, Sep. 17, 1990, Columbus, Ohio, US; Abstract No. 107249s, Liu Lingging: `Preparation of Superconductors of the Yttrium Barium Copper Oxide System by the Oxalate Method`.

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