| 摘要 |
PURPOSE:To obtain a superconductor capable of exhibiting superconductive characteristics at liquid nitrogen temperature or above by mixing powders of Bi oxide, Sr oxide, Ca hydroxide and Cu oxide, compression forming the mixed powders and calcining the resultant compact in an oxidizing atmosphere. CONSTITUTION:Powders of Bi oxide, Sr oxide, Ca hydroxide and Cu oxide are mixed so as to provide atomic ratios of Sr:Ca=1:0.3-3, Bi:Cu=1:1.8-4 and (Sr+Ca):(Bi+Cu)=1:1-2 and afford mixed powder. The resultant mixed powder is then compression formed and calcined at 830-880 deg.C in an oxidizing atmosphere to provide a superconductor consisting of Bi, Sr, Ca, Cu and O. |
