| 摘要 |
PURPOSE:To suppress the lowering of critical temp. at which electric resistance becomes zero and the lowering of critical current density by the application of a magnetic field by rendering a specified compsn. and incorporating Ag and Pt. CONSTITUTION:Powdery starting materials contg. Ag, Pt, Bi, Pb, Sr, Ca, Mg, Ba and Cu are weighed in a prescribed ratio, mixed, optionally calcined at 835+ or -20 deg.C for 20-200 hr and then sintered at 820-870 deg.C to obtain an oxide superconductor having a compsn. represented by the formula (where A is 0.15-0.35, B is 0.8-1.1, B' is 0.8-1.2, C is 0.05-0.3, D is < 0.2 and the numerals show atomic ratio) and contg. 10-35 wt.% Ag and 0.1-2 wt.% Pt. |
