Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-03-27
1991-12-03
Ryan, Patrick J.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505701, 505702, 505703, 505704, 428209, 428688, 428901, 428930, 361397, B32B 900
Patent
active
050700723
ABSTRACT:
Articles are disclosed in which an electrically conductive layer on a substrate exhibits a superconducting transition temperature in excess of 30.degree. K. Conductive layers are disclosed comprised of a crystalline rare earth alkaline earth copper oxide. Processes of preparing these articles are disclosed in which a mixed metal oxide precursor composition is coated and heated to its thermal decomposition temperature to create an amorphous mixed metal oxide layer. The amorphous layer is then heated to its crystallization temperature.
REFERENCES:
Hammond et al., "Superconducting Thin Films of the Perovskite Superconductors by Electron-Beam Deposition", Extended Abstracts High Temperature Superconductors, Anaheim California, Spring Meeting of the Materials Research Society, 23rd-24th Apr. 1987, pp. 169-171.
Koinuma et al., "Preparation of (La.sub.1-x Sr).sub.2 CuO.sub.4 Superconducting Films by Screen Printing Method", Japanese Journal of Applied Physics, vol. 26, No. 4, Apr. 1987, pp. L399-L401.
Koinuma et al., "Some Problems in the Preparation of Superconducting Oxide Films on Ceramic Substrates", Japanese Journal of Applied Physics, vol. 26, No. 5, Part 2, May 1987, pp. L763-L765.
J. G. Bednorz et al., "Possible High T.sub.c Superconductivity in the Ba-La-Cu-O System", Z. Phys. B.-Condensed Matter, vol. 64, pp. 189-193 (1986).
C. W. Chu et al., "Evidence for Superconductivity Above 40 K in the La-Ba-Cu-O Compound System", Physical Review Letters, vol. 53, No. 4, pp. 405-407, Jan. 1987.
C. W. Chu et al., "Superconductivity at 52.5 K in the Lanthanum-Barium-Copper-Oxide System", Science Reports, vol. 235, pp. 567-569, Jan. 1987.
R. J. Cava et al., "Bulk Superconductivity at 36 K in La.sub.1.8 Sr.sub.0.2 CuO.sub.4 ", Physical Review Letters, vol. 58, No. 4, pp. 408-410, Jan. 1987.
J. M. Tarascon et al., "Superconductivity at 40 K in the Oxygen-Defect Perovskites La.sub.2-x Sr.sub.x CuO.sub.4-y ", Science Reports, vol. 235, pp. 1373-1376, Mar. 13, 1987.
M. K. Wu et al., "Superconductivity at 93 K in a New Mixed-Phase Y-Ba-Cu-O Compound System at Ambient Pressure", Physical Review Letters, vol. 58, No. 9, pp. 908-910, Mar. 2, 1987.
Agostinelli John A.
Higberg Brian J.
Mir Jose M.
Paz-Pujalt Gustavo R.
Peterson David L.
Eastman Kodak Company
Ryan Patrick J.
Thomas Carl O.
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