| 摘要 |
PURPOSE: To produce a superconducting material usable simply at more than about 40K and having a high critical current density under an environment in which a magnetic field is impressed by mixing Bi2223 phase and (Bi, Pb) 1212 phase in a specified ratio. CONSTITUTION: In a Bi based superconducting material containing simultaneously the Bi2223 phase and the (Bi, Pb) 1212 phase, when a content of the former is Xmol.% and the content of the latter is Ymol.%, 1/3<=X/Y<=1.5. A material of the Bi2223 phase is, for example, the material expressed by formula Bi2-x Pbx Sr2 Ca2 Cu3 O10 (0<=x<=0.4), and the material of the (Bi, Pb) 1212 phase is, for example, the material expressed by the formula (Bi0.75-x Pbx Cu0.25 )Sr2 (Y0.5 Ca0.5 )Cu2 O7 (0.35<=x<=0.75). These material are mixed in a specified ratio, and orientation is formed with crystal particles of the Bi2223 phase which is relatively large in crystal particles and plain, and high critical current density (>=3000A/cm<2> ) is obtained even in a magnetic field by the (Bi, Pb) 1212 phase combined with the crystal of this Bi2223 phase. |
