Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1990-03-28
1992-02-18
Silbaugh, Jan H.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
264332, 427 62, 4273762, 505741, 505742, H01L 3912
Patent
active
050894684
ABSTRACT:
The present process for producing a Bi-based superconducting oxide includes the steps of molding a material powder and subjecting the molded article to partial melting and then to crystallization in the presence of oxygen. In that case, the molded article is annealed, after the partial melting, to the crystallization temperature and subjected to crystallization at that temperature. Also, the article after the crystallization is cooled and the cooled article is heat-treated in an inert gas atmosphere. According to the above process, there can be obtained a Bi-based superconducting oxide having excellent superconducting properties.
REFERENCES:
A. Ono, "Crystallization of 107K Superconducting Phase and Partial Melting in the Bi-(Pb)-Sr-Ca-Cu-O System", Japanese Journal of Applied Physics, vol. 27, No. 12, pp. 2276-2279 (1988).
Zonatto et al., "Melt Processing of Bi-Ca-Sr-Ca-O Superconductors", Ceramic Superconductors II, pp. 406-418.
S. Jin et al, Appl. Phys. Lett. 52, 1628-30, "Superconductivity in the Bi-Sr-Ca-Cu-O Compounds with Noble Metal Additions", (May 9, 1988).
T. Komatsu et al, IEEE Transactions on Magnetics, 25, 2150-2153, "High-T.sub.c Superconcucting Glass Ceramics Based on the Bi-Ca-Sr-Cu-O System", (Mar. 1989).
Oda Toshio
Oki Shuichiro
Sakai Hitoshi
Watanabe Keiichiro
Yoshida Hitoshi
Fiorilla Christopher A.
NGK Insulators Ltd.
Silbaugh Jan H.
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