Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-08-09
1990-11-06
Ryan, Patrick
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505701, 505702, 505703, 505704, 4284111, 428688, 428699, 428700, 428930, B32B 900
Patent
active
049686640
ABSTRACT:
A superconductive ceramic thin film-formed single-crystal wafer comprising a single-crystal wafer, an intermediate ceramic thin film formed on a surface of the single-crystal wafer, and a superconductive ceramic thin film formed on the intermediate ceramic thin film. The intermediate ceramic thin film comprises, as a main phase, a crystalline phase having a composition by atomic ratio of Bi.sub.2 Sr.sub.2 Ca.sub.x O.sub.y (provided that x: 1 to 2; and y: 6 to 7), and the superconductive ceramic thin film comprises, as a main phase, a crystalline phase having a composition by atomic ratio selected from the group consisting of Bi.sub.2 Sr.sub.2 Ca.sub.1 Cu.sub.2 O.sub.8 and Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10. Alternatively, the intermediate ceramic thin film comprises, as a main phase, a crystalline phase having a composition by atomic ratio selected from the group consisting of Tl.sub.1 Ba.sub.2 Ca.sub.s O.sub.t (provided that s: 1 to 2; and t: 4.5 to 5.5) and Tl.sub.2 Ba.sub.2 Ca.sub.v O.sub.w (provided that v: 1 to 3; and w: 6 to 8), and the superconductive ceramic thin film comprises, as a main phase, a crystalline phase having a composition by atomic ratio selected from the group consisting of Tl.sub.2 Ba.sub.2 Ca.sub.1 Cu.sub.2 O.sub.8, Tl.sub.1 Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10, Tl.sub.1 Ba.sub.2 Ca.sub.1 Cu.sub.2 O.sub.7, Tl.sub.1 Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.9, and Tl.sub.1 Ba.sub.2 Ca.sub.3 Cu.sub.4 O.sub.11.
REFERENCES:
CA 111 (26):245688u, SC Properties of BaYCuO Thin Films, Yamaguchi et al., 1989.
CA 111 (14):125175c, SC on Cheap Substrate with Ceramic Interlayer, Takano et al., 2-28-89.
Sugihara Tadashi
Takeshita Takuo
Mitsubishi Metal Corporation
Ryan Patrick
LandOfFree
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