Bismuth oxide superconductor and method of preparing the same

Details Bismuth oxide superconductor and method of preparing the same Bismuth oxide superconductor and method of preparing the same

1997-05-19

1999-06-08

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Superconductive metal or alloy

H01L 3924

Patent

active

059102225

ABSTRACT:
In a bismuth oxide superconductor having a composition of Bi--Sr--Ca--Cu or (Bi,Pb)--Sr--Ca--Cu and being covered with a metal sheath, the a-b plane of a 2223 phase, which is a 110 K phase, is oriented along the longitudinal direction as a matrix, while a dispersed superconducting phase mainly consisting of a 2212 phase, which is a 80 K phase, and/or non-superconducting phases is dispersed along the a-b plane in the 2223 phase, so that a magnetic field property of its critical current density is extremely improved. In order to prepare such a bismuth oxide superconductor, performed are the steps of preparing raw material which is based on a 2223 composition in. Bi--Sr--Ca--Cu or (Bi,Pb)--Sr--Ca--Cu in relation to blending/composition, consisting as a superconducting phase of mainly a 2212 phase and non-superconducting phases in relation to the crystal structure, covering the raw material with a metal sheath, and performing deformation processing and heat treatment on the composite.

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