Single crystalline fibrous superconductive composition and proce

Details Single crystalline fibrous superconductive composition and proce Single crystalline fibrous superconductive composition and proce

1993-08-26

1994-10-11

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Bismuth containing

505729, 505740, 505782, 252518, 252521, H01L 3912, H01B 1200, H01B 1202

Patent

active

053549210

ABSTRACT:
There is disclosed a single crystalline fibrous superconductive composition represented by the atomic compositional formula: Bi.sub.2 Sr.sub.2 CaCu.sub.2 M.sub.X O.sub.Y wherein 0<X<0.5; 7.8<Y<8.5; and M is at least one member selected from the group consisting of Pb, Sn, Sb, In, Cd, Ga, Ge, K, Li, and Na. This composition is prepared by a process comprising the step of mixing source material with one another to prepare a mixture having an atomic compositional ratio: Bi=1.00, Sr=0.5.about.2.0, Ca=0.5.about.5.0, Cu=1.0.about.7.0, and M=0.1.about.1.0, wherein M is at least one member selected from the group consisting of Pb, Sn, Sb, In, Cd, Ga, Ge, K, Li, and Na, the step of melting the mixture to prepare a molten material having an atomic compositional ratio: Bi=1.00, Sr=0.5.about.2.0, Ca=0.5.about.5.0, Cu=1.0.about.7.0, M=0.1.about.1.0, and O=3.5.about.8.8, the step of quenching the molten material to prepare a solid material, and the step of heat-treating the solid material in a stream of a gas containing oxygen.

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