Co-precipitation process for preparing superconductor powder

Details Co-precipitation process for preparing superconductor powder Co-precipitation process for preparing superconductor powder

1990-05-21

1993-04-06

Bell, Mark L.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505737, 505738, 505780, 252518, 252521, 501152, 501123, 423604, 423419R, 423593, 423635, H01B 1206, C01G 300, C04B 4189, H01L 3912

Patent

active

052003906

ABSTRACT:
A fine stoichiometric superconductor powder may be co-precipitated from the addition of appropriate metal compound powders in ammonium carbonate. The co-precipitated powder is very homogeneous because the reaction progresses in liquid solution. For example, YBa.sub.2 Cu.sub.3 O.sub.7-x superconducting powder may be prepared by the co-precipitation of yttrium oxide, copper (I) acetate, copper (II) acetate and barium acetate. The acetates precipitate by nucleating on the yttrium oxide particles. The process permits a relatively wide window of starting reactant proportions yet still produce ceramics having superconductive properties.

REFERENCES:
patent: 4886777 (1988-08-01), Kimura et al.
patent: 5002926 (1991-03-01), Spencer et al.
patent: 5045527 (1991-07-01), Ikeno et al.
Voigt et al., "A Hydroxycarbonate Route to Superconductor Precursor Powders", Mat'l. Res. Soc. Sym., vol. 99, 1988, pp. 634-638.
M. J. Cima, et al., "Powder Processing for Microstructural Control in Ceramic Superconductors," Advanced Ceramic Materials, vol. 2, No. 3B, Special Issue, 1987, pp. 329-336.
S. M. Johnson, et al., "Preparation of Superconducting Powders by Freeze-Drying," Advanced Ceramic Materials, vol. 2, No. 3B, Special Issue, 1987, pp. 337-342.
B. Dunn, et al., "Properties of Superconducting Oxides Prepared by the Amorphous Citrate Process," Advanced Ceramic Materials, vol. 2, No. 3B, Special Issue, 1987, pp. 343-352.
W. Wong-Ng, et al., "X-Ray Powder Characterization of Ba.sub.2 YCu.sub.3 O.sub.7-x, " Advanced Ceramic Materials, vol. 2, No. 3B, Special Issue, 1987, pp. 565-576.
A. Safari, et al., "A Comparative Study of Processing Methods and Property Relations of Y-Ba-Cu-O Superconductors," IEEE, 1988, pp. 181-187.

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