PROCESS FOR PRODUCING SUPERCONDUCTING(BI,TI)-CA(SR,BA)CU-O CERAMIC

摘要

A process for producing superconducting (Bi, Tl)-Ca-(Sr, Ba)-Cu-O ceramic suffering less variation in components, which comprises mixing a calcium compound, a strontium or barium compound and a copper oxide, each of which has a low vapor pressure among the powdery starting materials, in predetermined proportions, subjecting the mixture to primary firing at a predetermined temperature of 850 to 1050 DEG C to form a Ca-(Sr, Ba)-Cu-O oxide, mixing this oxide with a bismuth or thallium oxide, each of which has a high vapor pressure among the starting materials, and subjecting the mixture to secondary firing at a predetermined temperature of 500 to 820 DEG C.