METHOD OF PREPARING BISMUTH OXIDE SUPERCONDUCTOR

摘要

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 = -71.5 x log H + 600 are applied as to relation between temperature (T) [unit: DEG C] and time (H) [unit: hour]. 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.