| 摘要 |
PURPOSE:To provide readily producible oxide-based high-temperature superconducting ceramics having the high critical temperature and stable superconductive characteristics by composing the ceramics from Bi, Sr, Ca, Li, copper and oxygen at a specific molar ratio. CONSTITUTION:The above-mentioned oxide-based high-temperature superconducting ceramics are mainly composed of Bi, Sr, Ca, Li, copper and oxygen and preferably have the composition expressed by the formula (1<=v<=3; 1<=w<=2.2; 0.5<=x<=1; 2<=y<=3.5; 6<=z<=12; 0.05<=y/x<=0.5; 1<=x+y<=2.5). The aforementioned superconducting ceramics are preferably produced by a method for mixing powders of Bi2O3, SrCO3, CaCO3 and CuO at a prescribed molar ratio, calcining the resultant mixture, then adding LiCO3 at a prescribed molar ratio, forming and sintering the resultant mixture. |
