Superconducting 123YBaCu-oxide produced at low temperatures

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k

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505780, 505742, 505776, 252521, 423593, 423635, 427 62, 4271263, H01L 3900

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active

053407970

ABSTRACT:
A method of preparing a superconductor. The method includes preparing a mixture of superconductor material constituents, disposing the constituents on a silver containing substrate, heating the mixture of constituents on a silver containing substrate, heating the mixture in a first atmosphere having a partial pressure of CO.sub.2 to control decomposition of at least one of the superconductor material constituents and changing the first atmosphere to a second atmosphere consisting essentially of an oxidizing gas capable of allowing decomposition of at least one of the superconductor material constituents.

REFERENCES:
patent: 5055436 (1991-10-01), Klemptner et al.
patent: 5227365 (1993-07-01), Van den Sype
"Alignment of YBa.sub.2 Cu.sub.3 O.sub.7-x and Ag-YBa.sub.2 Cu.sub.3 O.sub.7-x Composites at .about. 930 C by Eutectic Formation", Zhou et al., J. of American Ceramic Society, vol. 74, No. 7, pp. 1541-1546, 1991.
"Phase Diagrams for High Tc Superconductors". Complied by National Institute of Standards and Technology, Published by the American Ceramic Society, Westerville, Ohio, 1991 pp. 84-89.
"Kinetic Effects in the Preparation of YBa.sub.2 Cu.sub.3 O.sub.7-x by Solid State Reaction", Klemptner et al., Presented at the American Ceramic Society, Electronics Materials Meeting, Arlington, Va., Oct. 22, 1991, pp. 1-14.
"Observation of Anomalous RF Dissipation in Thick Films of Superconducting YBa.sub.2 Cu.sub.3 O.sub.7-x ", Zhang et al., Physica C, 205, 1992, pp. 51-58.
"Processing of Bulk YBaCuO", Murakami, Supercond. Sci. Technol. No. 4, Apr. 1992, pp. 185-203.
"The Effects of Second Phase Additions (SiC, BaZrO.sub.3, BaSnO.sub.3) on the Microstructure and Superconducting Properties of Zone Melt Textured YBa.sub.2 Cu.sub.3 O.sub.7-x ", Chakrapani et al. Appl. Superconductivity, Jan., 1993, pp. 1-15.
"Production of Continuous Filaments of Melt-Textured YBa.sub.2 Cu.sub.3 O.sub.7-.delta. Superconductor," J. D. Hodge et al., Journal of Materials Science Letters, 10(1991), pp. 1362-1365.
"Preparation of a High-J.sub.c YBCO Bulk Superconductor by the Platinum Doped Melt Growth Method," N. Ogawa et al., Physica C, 177 (1991), pp. 101-105.
"Microstructure and Critical Current Density of Zone Melt Textured YBa.sub.2 Cu.sub.3 O.sub.6+x /Y.sub.2 BaCuO.sub.5 with BaSnO.sub.3 Additions," P. McGinn et al., Appl. Phys. Lett., 59(1), 1 Jul. 1991, pp. 120-122.
"The Peritectic Reaction," D. H. St. John, Aeta Metall. Mater., vol. 28, No. 4, pp. 631-636, 1990.
"The Effect of Er2BaCuO5 Additions on the Microstructure and Magnetic Properties of Zone Melt Textured YBa.sub.2 Cu.sub.3 O.sub.6+x Wires," D. Balkin et al., submitted to proceedings of 1992 Spring MRS Meeting, Apr. 1992.

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