A method for the production of bismuth -, - high temperature superconductors

摘要

PROBLEM TO BE SOLVED: To provide an efficient and stable method for manufacturing at low cost a bismuth type high temperature superconductor of Bi-2223 single phase or Bi/Pb-2223 single phase and being free of the second phase.;SOLUTION: A raw material powder mixture (a powder mixture of oxides and carbonates) having the same blending ratio of each amount of Bi, Sr, Ca and Cu or Pb contained in the raw material for calcination, as the stoichiometrical ratio in a superconducting crystal, Bi2Sr2Ca2Cu3Oz or (Bi, Pb)2 Sr2Ca2Cu3Oz, is calcinated using KCl as flux. Calcination is preferably practiced using precalcinated raw materials and/or keeping the calcination temperature constant.;COPYRIGHT: (C)2002,JPO