Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1990-09-24
1992-02-11
Beck, Shrive
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505735, 505734, 505742, 427 62, 427226, 4271263, B05D 512, B05D 302
Patent
active
050876090
ABSTRACT:
A process for forming an alkoxide-derived yttrium-barium-copper oxide high temperature superconductor thin film by sol-gel processing is disclosed. It comprises first forming a thin film comprising solubilized yttrium and barium alkoxides and copper aminoalkoxide, under an inert gas atmosphere, on a non-reactive substrate, the amount of copper amino alkoxide being in excess of the stoichiometric amount to compensate for losses due to volatility of the copper amino alkoxide. The coating composition is then heated first in a moisture laden inert gas atmosphere, to hydrolyze the alkoxides, to temperatures in excess of the formation temperature of the superconductor. It is thereafter calcined in an oxygen atmosphere at higher temperatures to form the high temperature superconductor thin film.
REFERENCES:
patent: 4920093 (1990-04-01), Nonaka et al.
patent: 4943558 (1990-07-01), Soltis et al.
Moore et al., "Sol-gel processing of Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x using alkoxide precursors, two systems yielding high degrees of thin film orientation and crystal growth", Materials letters, vol. 7, No. 12, Mar. 1989, pp. 415-424.
Antezzo Meiylin F.
Whitwell George E.
Akzo NV
Beck Shrive
Fennelly Richard P.
King Roy V.
Morris Louis A.
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