Method of preparing bismuth oxide superconductor

Details Method of preparing bismuth oxide superconductor Method of preparing bismuth oxide superconductor

1995-04-28

1998-11-24

Fiorilla, Christopher A.

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

Coating

264614, 264669, 264670, 427 62, 505492, 505501, C04B 3332

Patent

active

058406603

ABSTRACT:
Raw material powder for a bismuth oxide superconductor is molded with addition of an organic vehicle, and the molded raw material is heat treated for removing the organic vehicle before the molded raw material is metal-coated. In this heat treatment, conditions not more than those expressed as T=-1.5.times.logH+600 are applied as to relation between temperature (T) and time (H). Thus, phase transformation of 2212 phases mainly composing the raw material is suppressed so that a large amount of 2223 phases having a relatively high critical temperature are formed when heat treatment is performed after metal coating.

REFERENCES:
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patent: 5087604 (1992-02-01), Shinga et al.
patent: 5100866 (1992-03-01), Itozaki et al.
patent: 5104849 (1992-04-01), Shiga et al.
patent: 5248464 (1993-09-01), Alford et al.
Shiloh et al., "Formation of (Ca.sub.1-x Sr.sub.x).sub.2 PbO .sub.4 in Bi(Pb)-Sr-Ca-Cu-O system: Correlation with the formation of the 2223 high-T.sub.c phase", Journal Of Applied Physics, Sep. 1, 1990, USA, vol. 68, pp. 2304-2307.

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