Oxide superconductor and process for producing the same

摘要

PCT No. PCT/JP92/00402 Sec. 371 Date Dec. 1, 1992 Sec. 102(e) Date Dec. 1, 1992 PCT Filed Apr. 1, 1992 PCT Pub. No. WO92/17407 PCT Pub. Date Oct. 15, 1992.An oxide superconductor comprising a crystal of LnBa2Cu3Oy (wherein Ln is at least one of rare earth elements including Y) and, finely dispersed therein, Ln2BaCuO5 and a composite oxide of PtBaCuO having an average particle diameter of 0.1 to 10 mu m is disclosed. The oxide superconductor is produced by melting a raw material powder comprising a composite oxide of Ln, Ba and Cu, rapidly solidifying the melt, pulverizing the resultant solid, mixing a Pt powder with the pulverized mixture, forming a resultant mixture, heating a resultant formed body to bring the formed body to a partially-molten state and cooling the partially-molten material.