Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1992-03-20
1993-12-07
King, Roy
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505732, 505737, 505742, 427 62, 427226, 427596, B05D 306, B05D 302, B05D 512
Patent
active
052683540
ABSTRACT:
A process making thin film elements of an oxide superconductor (Tl..sub.5 Pb.sub.0.5)Sr.sub.2 CaCu.sub.2 O.sub.7, (Tl..sub.5 Pb.sub.0.5)Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.9 or a mixture thereof. The process entails forming an oxide film of a mixture of oxides of Pb, Sr, Ca and Cu in preselected amounts, placing the oxide film in a container of nonreactive metal such as gold that contains a powder of (Tl..sub.5 Pb.sub.0.5)Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.9 superconductor, sealing the container, and heating the sealed container to a temperature of about 820.degree. C. to about 950.degree. C. for at least 1 minute.
REFERENCES:
patent: 4894361 (1990-01-01), Subramanian
Subramanian et al, "Bulk Superconductivity Up to 122K in the Tl-Pb-Sr-Ca-Cu-O System", Science, vol. 242, Oct. 1988, p. 249.
Shah et al, "Fabrication of Tl-Ba-Ca-Cu-O Films by Annealing rf-Sputtered Ba-Ca-Cu-O Films in Thallium Oxide Vapors", Appl. Phya Lett. 56(8) Feb. 1990 pp. 782-784.
Moodera et al, "In Situ Deposition of Superconducting Bi-Pb-Sr-Ca-Cu-O Thin Films on MgO(100) Substrates by rf Magnetron Sputtering and Laser Ablation" Appl. Phys. Lett. 57(23) Dec. 1990 pp. 2498-2500.
Gupta et al, "Y.sub.1 Ba.sub.2 Cu.sub.2 O.sub.7-.delta. Thin Films Grown by a Simple Spray Depositoin Technique", Appl. Phys. Lett. 52(2) Jan. 1988 pp. 163-165.
Lee et al, "Superconducting Tl-Ca-Ba-Cu-O Thin Films with Zero Resistance at Temperatures of up to 120K", Appl. Phys. Lett. 53(4) Jul. 1988 pp. 329-331.
Krebs et al, "Conditions for Oriented Growth of Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O Films by Pulsed Laser Ablation", J. Appl. Phys. 69(4) Feb. 1991 pp. 2405-2409.
Nobumasa et al, "Formation of a 100K Superconducting Bi(Pb)-Sr-Ca-Cu-O Film by a Spray Pyrolysis", Jpn. J. Appl. Phys. 27(9) Sep. 1988 pp. L1669-L1671.
Blanchet-Fincher Graciela B.
Fincher, Jr. Curtis R.
Herron Norman
E. I. Du Pont de Nemours and Comapny
King Roy
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