Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-06-30
1991-09-17
Dixon, Jr., William R.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505742, 505778, H01L 3912
Patent
active
050495429
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=0) 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
T. Wada et al., "High T.sub.c Superconductor LaBa.sub.2 Cu.sub.3 O.sub.7-y with Feed Resistance at 92K" Appl. Phys Lett. 52/23), Jun. 6, 1988, pp. 1989-1991.
B. Bender et al., "Processing & Properties of the High T.sub.c Superconducting Oxide Ceramic YBa.sub.2 Cu.sub.3 O.sub.7 " Advanced Ceramics, vol. 2, No. 3B, 1987, pp. 506-511.
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, Z. 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.
Brass Stephen G.
Ghandehari Mohammad H.
Dixon Jr. William R.
Gallo Chris
Thompson Alan H.
Union Oil Company of California
Wirzbicki Gregory F.
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