| 摘要 |
PURPOSE:To obtain the title nontoxic material of high environmental resistance with broad applications, by adding a specified amount of Sn to a Bi-M-Cu- O-based superconducting material followed by calcination at specified temperature to attempt single phase formation at high critical temperature. CONSTITUTION:A Bi-M-Cu-O-based superconducting material (M is combination of plural elements selected from Ca, Sr and Ba) is spiked with Sn so as to be 0.007-0.07 in atom ratio Sn/Bi and calcined in an oxygen atmosphere at 600-800 deg.C. The resulting product is then put to compression forming, sintering and annealing, thus obtaining the objective material. According to the above process, separation of low critical temperature-phase can be prevented, leading to establishing stabilized superconductor phase, thereby accomplishing high critical current density and high critical temperature. |
