Superconducting material and method of producing same

Details Superconducting material and method of producing same Superconducting material and method of producing same

1991-04-09

1992-06-16

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252518, 252521, 501123, 501152, 505725, 505739, 505742, 505780, C01B 1314, C01F 1102, C01G 302, H01L 3912

Patent

active

051225034

ABSTRACT:
The present invention relates to a superconducting material that is, substances having compositions expressed by empirical formulae Y.sub.1-x Ba.sub.x CuO.sub.3, YBa.sub.2 Cu.sub.3 O.sub.7 and LnBa.sub.2 Cu.sub.3 O.sub.7 and critical temperatures of 90 K. or more, and to a method of producing the same in which for example Y.sub.2 O.sub.3, BaCO.sub.3 and CuO are blended at a mixture molar ratio of 1:2:6 and the resulting mixture is molded under pressure followed by slowly cooling in an oxidizing atmosphere.

REFERENCES:
Cava, R. J., et al.: Phys. Rev. Lett., 58 (No. 16), 20 Apr. 1987, pp. 1676-1679.
Engler, E. M. et al.: J. Am. Chem. Soc., 109, pp. 2848-2849, 29 Apr. 1987.
Tapes 1 & 2 of the American Physical Society meeting in New York City, Mar. 18, 1987 (VHS Cassette).
Hirabayashi, M. et al.: Jpn. J. Appl. Phys., 26, No. 4, Apr. 20, 1987, pp. L454-L455.
Kurihara, S., et al.: Proceedings of Symposium S, 1987 Spring Meeting of MRS, Apr. 23-24, 1987, Anaheim, Calif., pp. 145-148.
Preprint: Qadri, S. B., et al.: "X-Ray Identification . . . in the Y--Ba--Cu--O System", Naval Research Lab, Washington, D.C., 5 Mar. '87.
Qudri, S. B., et al.: Phys. Rev. B, 35, No. 13, 1 May 1987, pp. 7235-7237.
Michel, C. et al., Revue de Chimie Minerale, 41, 1984, pp. 407-425.

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