摘要 |
PURPOSE:To make the critical current density higher by mixing particular two kinds of oxide with a particular composition ratio to produce a mixture material, and filling said mixture material into a metal sheath to form a composite material, and subjecting a strand consisting of said composite material to a heat treatment. CONSTITUTION:A mixture, prepared by mixing a first and second oxides expressed by the formula I, formula II with a composition ratio 1:alpha (5>alpha>1), is filled into a metal sheath 4 to form a composite material. Then, a multiplicity of the composite material are bundled together and subsequently reduced in diameter to form a strand, and this strand is subjected to a heat treatment in an oxygen gas stream to produce a superconductive multiconductor wire 8. By this heat treatment, a diffusion reaction can take place in a state wherein the first oxide is surrounded by the fused second oxide so that an oxide type superconductor 6 with a higher critical current density may be produced. In the formula I, II, A expresses one or more of group IIIa elements in the periodic table, B expresses one or more of group IIa elements in the periodic table, and y expresses an integer 5-15. |