(Hg,Pb)-Ba-Ca-Cu-O superconductor and method of manufacturing th

Details (Hg,Pb)-Ba-Ca-Cu-O superconductor and method of manufacturing th (Hg,Pb)-Ba-Ca-Cu-O superconductor and method of manufacturing th

1994-09-12

1995-08-22

King, Roy V.

Superconductor technology: apparatus, material, process

High temperature , per se

Copper containing

505500, 505490, 505785, 505776, 505739, 423593, 423596, 252518, 252521, C01F 1102, C01G 302

Patent

active

054440394

ABSTRACT:
The oxide superconductor according to the present invention is represented by (Hg.sub.1-x Pb.sub.x)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub..delta. (0.08.ltoreq.x.ltoreq.0.41, 7.625.ltoreq..delta..ltoreq.9.15), and has a crystal structure in which a lamination unit of (Hg, Pb)O.sub.z -BaO-CuO.sub.2 -Ca-CuO.sub.2 -Ca-CuO.sub.2 -BaO is laminated in a c-axial direction of the crystal structure (0.625.ltoreq.z.ltoreq.2.15). Further, the method of manufacturing an oxide superconductor, according to the present invention, includes the steps of: mixing material powders of HgO, PbO, BaO, CaO and CuO at a mole ratio of (Hg.sub.1-x Pb.sub.x):Ba:Ca:Cu=a:2:b:c (1.ltoreq.a.ltoreq.2.5, 2.ltoreq.b.ltoreq.3, 2.5.ltoreq.c.ltoreq.4) and compression-molding the mixture powder into a compact; and subjecting the compact to a thermal treatment at 600.degree.-750.degree. C.

REFERENCES:
patent: 5081074 (1992-01-01), Murayama et al.
patent: 5317008 (1994-05-01), Imai
Xue et al, "Pb-doping effects in Hgr.sub.x Pb.sub.x Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.8+8 ", Modern Physics letters B, vol. 7, No. 28, pp. 1833-1842, Dec. 10, 1993.
Nature, vol. 353, May 6, 1993, pp. 56-58, Superconductivity above 130K in the Hg-Ba-Ca-Cu-O System, A. Schilling et al.
Physica C-162-164, (1989) pp. 291-295, North-Holland, Disappearance of High Temperature Superconductivity Induced by High Carrier Concentrations, J. Torrance et al.
Physical Review B, bol. 46, No. 22, Dec. 1, 1992, pp. 14928-14931, Systematics in the Thermoelectric Power of High-T.sub.c Oxides, S. Obertelli et al.
The 1993 International Workship on Superconductivity, Jun. 28-Jul. 1, 1993, Hakodate, Japan, Influence of Electric States of Bi-O) Layer on Irreversibility Magnetic Fields . . . , Toshihide Nabatame, et al pp. 230-231.
Phys. Chem. Molec. Oxide Superconductors, USA, Jul. 27-31, 1993 Crystal Structure and Anisotropy of Iodine-intercalated . . . , K. Kishio et al, pp. 1-11.

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