Synthesis of Bi.sub.1.8 Pb.sub.0.4 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.

Details Synthesis of Bi.sub.1.8 Pb.sub.0.4 Sr.sub.2 Ca.sub.2 Cu.sub.3 O. Synthesis of Bi.sub.1.8 Pb.sub.0.4 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.

1995-04-10

1996-10-29

Lieberman, Paul

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

Process of making wire, tape, cable, coil, or fiber

505121, 505501, 505492, 505782, 423593, 252521, C04B 35622, C04B 3564, H01B 1200

Patent

active

055696414

ABSTRACT:
Two-powder processes for the synthesis of superconducting (Bi, Pb)-2223/Ag-clad wires by the oxide-powder-in-the-robe are provided. The first precursor powder, of nominal stoichiometry CaCuO.sub.x, is a solution-synthesized mixture of Ca.sub.0.45 Cu.sub.0.55 O.sub.2 and CaO. Using these oxide precursor mixtures, superconducting tapes with well-aligned grains and reproducible critical current densities J.sub.c in the range of 20,000 to 26,000 A/cm.sup.2 at 75 K in self-field after annealing less than 200 hours were obtained.

REFERENCES:
patent: 5026680 (1991-06-01), Sugihara et al.
patent: 5049541 (1991-09-01), Uzumaki et al.
patent: 5057488 (1991-10-01), Arendt et al.
patent: 5300486 (1994-04-01), Hults et al.
patent: 5354535 (1994-10-01), Dorris et al.
Abstract Only. Smith et al "Synthesis of Ag-clad (Bi,Pb)-2223 tapes by an alternative precursor . . . " Physica C (Amsterdam), 231(3-4) pp. 409-415, 1994. No Month Available.

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