Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-01-31
1992-10-06
Bell, Mark L.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505742, H01L 3912
Patent
active
051531704
ABSTRACT:
Orthorhombic perovskitic metal-oxide superconductors of the lanthanum-barium-copper type (LaBa.sub.2 Cu.sub.3 O.sub.y) wherein Y ranges from 6.8 to 7.0, and T(R=O) is at least about 90.degree. K., can be prepared by sintering and annealing a substantially stoichiometric calcined mixture of one or more sources lanthanum, barium and copper under conditions wherein the time and temperature of exposure to oxygen during the sintering and annealing operations is controlled.
REFERENCES:
patent: 4804649 (1989-02-01), Sherif
Hor et al. "Superconductors Above 90K in the Square-Planar Compound System ABa.sub.2 Cu.sub.3 O.sub.6 +x with A=Y, La, Nd, Sm, Eu, Gd, Hu, Er & Lu", Physical Review Letters May 1987, pp. 1891-1894.
Kaplan et al., "The Preparaton of High T.sub.c Superconductors from Nitrates", Material Research Bulletin vol. 23, No. 2, 1988.
T. Wade, N. Suzuki, T. Meada, A. Maeda, S. Uchida, K. Uchinokura and S. Tanaka; "High Transition Temperature Superconductor LaBa.sub.2 Cu.sub.3 O.sub.7-y With Zero Resistance at 92 K", Appl. Phys. Lett. 52(23), Jun. 6, 1988, pp. 1989-1991.
R. L. Meng, P. H. Hor, Y. Q. Wang, L. J. Juang, Y. Y. Sun, L. Gao, J. Berchtold, J. C. Chu and C. W. Chu, Texas Center of Superconductivity at the University of Houston, Houston, Tex. 77004 "Processing, Chemical Reaction, Instabilities and High Temperature Superconductivity", pp. 233-235.
B. Bender et al., "Procesing & Properties of the High T.sub.c Superconductivity Oxide Ceramic YBa.sub.2 Cu.sub.3 O.sub.7 ", Advance Cr. Matl's vol. 2, No. 3b, 1987, pp. 506-571.
Brass Stephen G.
Ghandehari Mohammad H.
Bell Mark L.
Gallo Chris
Thompson Alan H.
Union Oil Company of California
Wirzbicki Gregory F.
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