| 摘要 |
PURPOSE:A ceramic superconductor consisting of a compsn. expressed by a specified formula consisting of Y, Ba, Cu, and O, and at least one kind among S, Se, and Te, having superior superconductive characteristics such as critical current density (Jc), etc. CONSTITUTION:The ceramic superconductor of this invention is a Y-Ba-Cu-O type superconductor consisting of a compsn. expressed by the formula. In this superconductor, one Cu atom is surrounded by 6 oxygen atoms forming an octahedron. The octahedron forms a two dimensional layer. By the lamination of several numbers of this layer, a layered perovskite structure is formed by distributing Y atoms and Ba atoms between said layers. Usually, rhombic crystals and tetragonal crystals are mixed in this octahedral crystal structure. The rhombic crystals form a superconductor in the Y-Ba-Cu-O system. In accordance with this invention, a ceramic superconductor having sufficiently higher Tc than the b.p. of liquid N2 and extremely high Jc is obtd. Accordingly, distinct effect in the practicalization of a ceramic superconductor is attained. |
