| 摘要 |
PURPOSE:To readily produce a wire or filmy molded item having excellent superconducting properties, by quenching with forming after melting of a raw material to obtain amorphous state and heat-treating, in a production of a superconductor of Bi-Sr-Ca-Cu-O based oxide. CONSTITUTION:Respective compounds of Bi, Sr, Ca and Cu are molten at least 900 deg.C to obtain a melt composed of Bi, Sr, Ca, Cu and O. Obtained melt is quenched, with forming to a fixed shape, to an amorphous molded item, then the molded item is heat-treated at 600-880 deg.C to impart superconducting properties together with crystallization. By the method, raw materials are readily formed to various shape such as a wire or a filmy molded item and crystallite size is controlled by changing of heat-treating condition, a fine and dense texture is obtainable and an oxide superconductor having excellent superconducting properties. |
