Superconductor technology: apparatus – material – process – High temperature – per se – Bismuth containing
Patent
1993-07-19
1995-05-09
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Bismuth containing
505782, 505785, 505784, 505124, 252518, 252521, 501123, 423592, 423604, H01B 1200, H01L 3912
Patent
active
054139813
ABSTRACT:
A method for manufacturing the oxide superconductor according to the present invention comprises the steps of: mixing a starting material including Bi, Sr, Ca and Cu such that a mole ratio of Bi, Sr, Ca and Cu is 2:2+a:1+b:2+c, wherein a.gtoreq.0, b.gtoreq.0, c.gtoreq.0, and 0<a+b+c<3; melting the mixed material at a temperature of 900.degree. C.-1500.degree. C.; quenching rapidly the molten material; and annealing the quenched material at a partial molten temperature of 800.degree. C.-1000.degree. C. This method gives product wherein a precipitate of at least one compound in the group SrO, CuO and (Ca.sub.1-x Sr.sub.x).sub.2 CuO.sub.3 (wherein 0.gtoreq.x<1) is finely dispersed in the superconducting crystal of Bi.sub.2 Sr.sub.2 Ca.sub.1 Cu.sub.2 O.sub.y (wherein y is about 8). The precipitates act as flux pinning centers.
Further, an oxide superconductor according to the present invention comprises superconducting crystal consisting of Bi, Sr, Ca and Cu oxides and separate oxide phases including Pt as a principal component being finely dispersed in the superconducting crystal. These finely dispersed oxides including Pt act as flux pinning centers.
REFERENCES:
patent: 5114909 (1992-05-01), Shi
Yoshida et al "Effects of the Platinum Group Element Addition . . . " Physica C 185-189 Dec. 1991 pp. 2409-2410.
"Preparation of Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.x Superconductors from Amorphous Films by Rapid Quenting after Rapid Melting"; M. Yoshimura et al; Japanese Journal of Applied Physics, vol. 27, No. 10, Oct. 1988, pp. L1877-L1879.
"Flux Pinning by Precipitates in the Bi-Sr-Ca-Cu-O system"; D. Shi et al; Physical Review B, vol. 40, No. 7, 1 Sep. 1989, pp. 5255-5258.
Egawa Kunihiko
Kinouchi Shin-ichi
Nozaki Ayumi
Umemura Toshio
Utsunomiya Shin
Kopec M.
Lieberman Paul
Mitsubishi Denki & Kabushiki Kaisha
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