| 摘要 |
PURPOSE:To obtain the title material having a high critical temp. without using an expensive rare-earth element by preparing the specified amts. of the oxides of Bi, Sr, Ca, and Cu constituting the desired material or their precursors, mixing the materials, forming the mixture, and then sintering the formed product. CONSTITUTION:The powdery oxides of Bi, Sr, Ca, and Cu constituting the desired material or their precursors are prepared respectively in specified amts., and mixed. The mixture is calcined, for example, at about 800 deg.C for about 5hr in an O2 atmosphere. The calcined materials are crushed, mixed, and then formed. The formed product is sintered, for example, at about 850 deg.C for about 10hr in an O2 atmosphere to obtain the superconducting material shown by BixSryCazCutOdelta [where 30<=x<=35, 22<=y<=28, 12<=z<=18, 23<=t<=28, (x+y+z+t)=100, and delta is a value determined by the selection of x-t]. |
