CHODENDOZAIRYONONETSUSHORIHOHO

摘要

PURPOSE:To obtain a superconducting material having >=90K critical temp. at a low cost by applying a combination of two processes with different temps. and oxygen partial pressures to a super-conducting material consisting essentially of LaBa2Cu3O7-delta. CONSTITUTION:The superconducting material consisting essentially of LaBa2Cu3 O7-delta is heated at a temp. higher than 950 deg.C and not exceeding the m.p. and at <=5X10<-2> atm oxygen partial pressure. The heated material is heated at <=400 deg.C, preferably 400-200 deg.C or more preferably about 300 deg.C, and at 2X10<-1> atm oxygen partial pressure in a water-free atmosphere. The water-free atmosphere contains 0.005mg/l water, and can be realized by passing an oxygen- contg. gas through a dehydrating agent such as silica gel, KOH, and P2O5 and supplying the dehydrated gas to a reaction zone.