| 摘要 |
PURPOSE:To provide the titled perovskite-type superconducting material having high critical current density, composed of Ln-Ba-Cu-O, etc., and containing Ln elements (Ln is two or more kinds of elements selected from Y, La, Sc, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb), Ba and Cu at specific atomic ratios. CONSTITUTION:Precursor substances (e.g. Y2O3, Eu2O3, BaO and CuO) of Ln elements (Ln is two or more kinds of elements selected from Y, La, Sc, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb), Ba and Cu are used as raw materials and are mixed with each other at ratios to attain the atomic ratios of Ln elements:Ba:Cu of 1:2:3. The mixture is calcined, pulverized, formed into a prescribed shape, calcined and heat-treated at 600-960 deg.C in O2 to obtain the titled perovskite-type superconducting material expressed e.g. by formula LnBa2 Cu3O7-delta (delta is <=1). |
