Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-08-10
1991-05-28
Dean, Rob R.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
423593, 505738, H01B 1200, H01L 3912
Patent
active
050195557
ABSTRACT:
The present invention is related to a composition and methods for producing highly pure, high temperature superconducting materials having the general formula MBa.sub.2 Cu.sub.3 O.sub.7-x, where M is yttrium or a rare earth element and x is from 0 to 0.5. The superconducting material is produced by first obtaining a solution of yttrium or rare earth element and copper. Next a solution of barium is obtained. The two solutions are heated and mixed together forming a precursor precipitate of the superconducting material. Subsequently, in one embodiment of the invention, the precipitate is recovered, calcined, sintered and slow cooled in oxygen or air. This produces a material having a desirable orthorhomic structure which is superconductive at high temperatures.
Because no organic solvents are used and no pH control other than the amount of barium in the solution is employed, it is possible to provide a highly pure superconducting material.
REFERENCES:
patent: 4636378 (1987-01-01), Pastor et al.
patent: 4661282 (1987-04-01), Clark
Capone, II et al., "Upper Critical Fields and High Superconducting . . . Appl. Phys. Left 5019)", Mar. 2, 1987, pp. 543-544.
Kawai et al., "Preparation of High-Tc Y-Ba-Cu-O Superconductor", Jap. J. of Appl. Phys. vol. 26, No. 5, May 1987, pp. L736-L737.
Kini et al., "High-Tc Superconductor: Selective Preparation and . . . " Inorganic Chemistry, vol. 26, No. 12, 1987, pp. 1834-1836.
Wang et al., "Comparison of Carbonate, Citrate, and Oxalate Chemical . . . " Inorganic Chemistry, vol. 26, No. 10, 1987, pp. 1474-1476.
Chin Jack
Liang Samuel S.
Dean Rob R.
General Atomics
Schumaker David W.
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