Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-01-24
1990-04-03
Morgenstern, Norman
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
427 62, 4271263, 4272553, 505732, 505730, 419 19, 419 20, 419 22, 419 28, 419 33, 419 55, B05D 512, C23C 1408
Patent
active
049140809
ABSTRACT:
A method for fabricating a superconductive film composed of a RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.x compound, or a (Bi.Sr.Ca.Cu.O) compound. In a first embodiment, oxides or carbonates of the component materials, namely Y.sub.2 O.sub.3, BaCO.sub.3, and CuO are mixed in atomic ratios of 1:2:3, according to the chemical formula of RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.x, and sintered to create a rhombic perovskite structure. The sintered mixture is powdered again, with added powdered amounts of Y.sub.2 O.sub.3 and powdered metallic Cu, and sintered. The sintered product is used as the source for an electron beam evaporator. In a second embodiment the (Bi.Sr.Ca.Cu.O) compound is formed into a sintered pellet which is composed of a mixture of one part of BiO, 3-15 parts of SrCO.sub.3, 4-30 parts of CaCO.sub.3, and 2-5 parts of CuO, in atomic ratios of Bi, Sr, Ca and Cu.
REFERENCES:
patent: 4362767 (1982-12-01), Nouchi et al.
patent: 4377607 (1983-03-01), Yoshida et al.
Tachikawa et al, "High Tc Superconducting Films of Y-Ba-Cu Oxide Prepared by a CO.sub.2 Laser Beam Evaporation", MRS vol. 99, Nov. 1987, pp. 723-726.
Koch et al, "Thin Films and Squids Made from YBa.sub.2 CU.sub.3 O.sub.y ", MRS ed. Gubser et al, Apr. 1987 (Anaheim, CA) pp. 81-84.
Maeda et al, "A New High-Tc Oxide Superconductor without a Rare Earth Element", Jpn. J. Appl. Phys. 27(2), Feb. 1988, L209-210.
Awaji Naoki
Ohsako Nagisa
Park Kyung-Ho
Ri Seigen
Yoshikawa Kohta
Fujitsu Limited
King Roy V.
Morgenstern Norman
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