Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1992-02-20
1993-10-05
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252518, 252521, 505782, C01F 1102, C01G 302, C01G 2900, H01L 3912
Patent
active
052505090
ABSTRACT:
The invention relates to an oxide-ceramic superconducting material which contains bismuth, strontium, calcium and copper, having an overall composition of Bi.sub.y Ca.sub.2 Sr.sub.2 Cu.sub.3 O.sub.x, where y is an integer from 2.35 to 2.6 and x is about 10 to 12. The material has a critical temperature T above 105 K and has a proportion of the phase Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x of at least 85% by volume. The invention also relates to a process for producing a bismuth-containing superconducting material which comprises holding the oxides or oxide precursors of bismuth, strontium, calcium and copper at a temperature in the range from 850.degree. to 890.degree. C. over a time span of a plurality of hours and adhering to the following atomic ratios:
REFERENCES:
Jones "Substitutions of 3-d transition metals ions . . . " Physica C v.162-4 Dec. 1989 pp. 25-26.
Gyorgy "Magnetization and critical currents of Bi-Sr-Ca-Cu-O . . . " Appl. Phys. Lett. v. 53 (22) Nov. 28, 1988 pp. 2223-2225.
Ono "A 105 K Superconducting phase in the Bi-Sr-Ca-Cu-O . . . " Jap. Jnl. Appl. Phys. v. 27(6) Jun. 1988 p. L1007-8.
Partial translation of Japanese Patent Laid-open No. 243519/1990, Sep. 27, 1990.
Patent Abstracts of Japan, vol. 14, No. 562 (C-788), Dec. 13, 1990 & JP-A-22 43 519 (Chodendo Hatsuden K), Sep. 27, 1990.
Materials Science Forum, Bd. 62-64, Apr. 27, 1990, pp. 87-88, V. S. Kravchenko "Synethesis of Bismuth-Containing High-Tc Ceramics".
Hettich Bernhard
Majewski Peter
Petzow Gunter
Schulze, deceased Klaus
Boyd John
Hoechst Aktiengesellschaft
Lieberman Paul
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