| 摘要 |
PURPOSE:To provide the titled superconducting material having high critical current density and containing an Ln element (Ln is one or more elements selected from Y, La, Sc, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu), Cu and Ba which is partly substituted with a specific element. CONSTITUTION:Precursor substances (e.g. Y2O3, BaO, CuO and SrO) of an Ln element (Ln is one or more elements selected from Y, La, Sc, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu), Ba, Cu and Sr and/or Ca substituting a part (e.g. 0.01-80mol.%) of Ba are used as raw materials and are mixed with each other at ratios to attain the atomic ratios of Ln element/Ba/Cu of 1:2:3. The mixture is calcined, pulverized, formed into a prescribed shape, baked and heat-treated at 600-960 deg.C in O2 to obtain the titled superconducting material having an oxygen-deficient perovskite structure expressed e.g. by formula LnBa2 Cu3O7-delta (delta is <=1). |
