Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-02-29
1990-02-13
Albrecht, Dennis
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252518, 252521, 423263, 423593, 423604, 423636, 501123, 501126, 505809, 505810, C01F 1700, C01G 302, H01L 3912
Patent
active
049007157
ABSTRACT:
Superconducting compositions of the general formula A.sub.n Q.sub.m Cu.sub.3 O.sub.y are prepared by wet mixing a combination organic acid salts, inorganic acid salts and oxides of A, Q and Cu, wherein at least one salt is an organic acid salt, drying the mixed salts, and then heating the resultant mixed salts to a temperature between 500.degree. and 950.degree. C. The temperature is maintained for a time sufficient to form a substantially orthorhombic superconducting composition. The method achieves good results with only one heating step. The presence of at least one organic salt causes carbonate and nitrate salts of A, Q and Cu to convert to oxides at temperatures between 300.degree. and 400.degree. C. With lower processing temperatures, semiconductor materials and superconducting materials can be processed together.
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Davidson, W. W. et al.: MRS Symposium Proceedings, vol. 99, High Temperat Superconductors, Nov. 30-Dec. 4, 1987, Boston, pp. 289-292.
Hamdi, A. H. et al.: Appl. Phys. Lett., 51(25), 21 Dec. 1987, pp. 2152-2154.
Rice, C. E. et al.: Appl. Phys. Lett., 51(22), 30 Nov. 1987, pp. 1842-1844.
"Processing and Properties of the High T.sub.c Superconducting Oxide Ceramic YBa.sub.2 -CU.sub.3 O.sub.7 ", Compilation of NRL Publications on High Temperature Superconductivity, pp. 63-65, (Jul. 1987), Bender et al.
Preparation, Structure and Magnetic Field Studies of High T.sub.c Superconductors, Compilation of NRL Publications on High Temperature Superconductivity, pp. 105-113, (Jul. 1987), Osofsky et al.
Cooper John C.
Guy Joseph T.
Panayappan Ramanathan
Albrecht Dennis
McDonnell Thomas E.
Spevack A. David
The United States of America as represented by the Secretary of
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