Method of preparing bismuth oxide superconductor.

摘要

Disclosed herein is a method of preparing a bismuth oxide superconductor by forming a superconducting phase having a 2223 composition or a 2212 composition in a composition of Bi-Sr-Ca-Cu or (Bi,Pb)-Sr-Ca-Cu in a metal sheath. This method comprises the steps of preparing raw material powder containing a mixture of a 2212 phase having the 2212 composition and non-superconducting phases, carrying out a process of heat treating the raw material powder under a reduced pressure of not more than 1 atm. immediately before filling the same into the metal sheath and thereafter cooling the same under an oxygen atmosphere, and filling the raw material powder into the metal sheath and thereafter performing deformation processing and heat treatment on the metal sheath. This method is suitable for preparation of a long wire.