STUDY OF SUPERCONDUCTING AND PHYSICAL-PROPERTIES OF 110K (BI,PB)-SR-CA-CU-O SUPERCONDUCTORS FROM GLASS PRECURSOR

High quality samples of 110 K (Bi-1.6 Pb-0.4) Sr-1.7 Ca-2.3 Cu-3 O-y w ere prepared in the form of long-length rods by rapid quenching of the melt, which showed a glass transition temperature of 379.77 degrees C , crystallization temperature of 463.4 degrees C and melting temperatu re of 861.5 degrees C. We also prepared glasses of Bi(1-x)R(x)SrCaCuO( y) (R = Al and x = 0.5) system at various melting temperatures which o n further heat treatment under appropriate conditions, crystallized in to superconducting phase(s). It was found that copper ions in the glas ses exists mainly in the Cu(I) ionic state and the Cu(I)/Cu(total) rat io increases with glass melting temperature. The control of the Cu(I)/ Cu(total) ratio leads to the successful continuous drawing of Bi-Ca-Sr -Cu-O glass fibers.