Superconductor technology: apparatus – material – process – High temperature – per se – Copper containing
Patent
1994-12-15
1997-09-23
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Copper containing
505482, 505500, 505776, 505778, 752521, H01B 1200, H01L 3912, C04B 3501, C04B 3503
Patent
active
056704577
ABSTRACT:
An oxide superconductor composed of Cu, O and at least one of Ba, Sr and Ca and including alternately arranged at least one oxygen-deficient perovskite structure section and at least one infinite layer structure section, wherein the perovskite structure section consists of two first atomic layers and a second atomic layer sandwiched between the first layers, and wherein the infinite layer structure section consists of alternately arranged, third and fourth atomic layers. Each of the first layers consists of O and an element M.sup.1 selected from Ba, Sr and Ca and has an atomic ratio O/M.sup.1 of 1 or less, while the second layer consists of O and Cu and has an atomic ratio O/Cu of 2 or less. Each of the third layers consists of O and Cu and has an atomic ratio O/Cu of 2, while each of the fourth layers consists of an element M.sup.2 selected from Ba, Sr and Ca. A superconductor having a superconducting critical temperature of over 100 K. may be produced by heat treatment at 800.degree.-1,200.degree.C. under a super-high pressure of 20,000-80,000 atm.
REFERENCES:
patent: 5372990 (1994-12-01), Nobumasa et al.
patent: 5374611 (1994-12-01), Dabrowski et al.
patent: 5446017 (1995-08-01), Sakurai et al.
patent: 5529981 (1996-06-01), Holloway
Adachi et al "High-pressure synthesis of superconducting Sr-Ca-Cu-O samples" Physica C, 208 10 Apr. 1993, pp. 226-230.
Li et al "Epitaxial Growth & Properties of Ca.sub.1-x Sr.sub.x CuO.sub.2 Thin Films . . . " Jpn. J. Appl. Phys., vol. 31 (Mar. 1992) pp. L217-L220.
Adachi Seiji
Jin Changqin
Tanaka Shoji
Wu Xiao-Jing
Yamauchi Hisao
International Superconductivity Technology Center
Kopec Mark
Lieberman Paul
Matsushita Electric - Industrial Co., Ltd.
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