High-temperature superconductor comprising barium sulfate, stron

Details High-temperature superconductor comprising barium sulfate, stron High-temperature superconductor comprising barium sulfate, stron

1992-07-10

1994-03-15

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252518, 252521, 505739, 505782, 505785, C01F 1102, C01G 302, C01G 2900, H01L 3912

Patent

active

052946010

ABSTRACT:
The invention relates to a high-temperature superconductor composed of the oxides of bismuth, strontium, calcium and copper and, optionally, of lead, and having the composition Bi.sub.2-a+b+c Pb.sub.a (Sr, Ca).sub.3-b-c Cu.sub.2+d O.sub.x, where a=0 to 0.7; b+c=0 to 0.5; d=-0.1 to 0.1 and x=7 to 10 and a Sr:Ca ratio of 2.8:1 to 1:2.8 as well as of strontium and/or barium sulfates. Said superconductor can be prepared by intimately mixing the oxides of bismuth, strontium, calcium and copper and optionally of lead with strontium and/or barium sulfates, melting the mixture by heating to temperatures of 870 to 1300.degree. C., higher temperatures being required for higher strontium and/or barium sulfate contents, pouring the melt into molds and allowing it to solidify slowly therein and subjecting the moldings removed from the molds to a heat treatment at temperatures of 700 to 900.degree. C. in an oxygen-containing atmosphere.

REFERENCES:
patent: 4880771 (1989-11-01), Cava
patent: 5047391 (1991-09-01), Bock et al.
patent: 5059581 (1991-10-01), Vasquez
patent: 5087606 (1992-02-01), Fleischer
patent: 5157015 (1992-10-01), Snyder
Hazen "Superconductivity in the High-T.sub.c Bi-Ca-Sr-Cu-O System" Phys. Rev. Letts v. 60(12) Mar. 21, 1988 pp. 1174-1177.
Ekin "Transport critical current in bulk sintered Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.x . . . " Adv. Cer. Mat'ls vol. 2(3B) Jul. 1987 pp. 586-592.
Vasquez "Wet chemical techniques for passivation of YBa.sub.2 Cu.sub.3 O.sub.x " Appl Phys. Letters v. 55(17) Oct. 23, 1989 pp. 1801-1804.
Derwent Database JP 1160861.
Derwent Database, Week 8931, JP 1 160 861 (Jun. 23, 1989) Abstract only.

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