| 摘要 |
PURPOSE:To improve superconductive characteristics such as critical temp. and critical current density by gradually cooling an oxide superconducting material in an oxygen atmosphere in the production process of the superconducting material having a crystalline structure in which a first layer containing copper atoms, second layer containing lead atoms, and third layer containing alkaline-earth elements and rare earth elements are successively deposited. CONSTITUTION:The first layer (A) has an octahedron structure containing a cupper atom in the center and oxygen atoms at vertex. The second layer (B) has an octahedron structure containing lead or copper atom in the center and oxygen atoms at vertex, sharing the oxygen atoms with the layer (A). The third layer (C) consists of oxygen atoms shared with the layers (A) and (B), alkaline-earth elements, and rare earth elements. A molded body of the oxide superconducting material having the crystalline structure comprising successively deposited layers (A), (B) and (C) is clalcined in an oxygen atmosphere, and then slowly cooled at 100 deg.C/h cooling rate or annealed at 400-700 deg.C for 12-72 hours in oxygen. |
