High-T/sub c/ superconducting glass ceramics based on the Bi-Ca-Sr-Cu-O system

Various high-T/sub c/ superconducting glass ceramics based on the Bi-Ca-Sr-Cu-O system were prepared by the melt-quenching method. The melt-quenched sample of Bi/sub 1.2/CaSrCu/sub 2/O/sub x/ was found to be a glass that became a high-T/sub c/ superconductor with T/sub c/ (zero)=85 K by annealing at 820 degrees C. The Bi/sub 1-x/Pb/sub x/CaSrCu/sub 2/O/sub y/ glasses also became high-T/sub c/ superconductors upon annealing at temperatures above 800 degrees C. The glass ceramics of Bi/sub 0.9/Pb/sub 0.1/CaSrCu/sub 2/O/sub x/ exhibited superconductivity with T/sub c/ (onset)=116 and T/sub c/ (zero)=100 K.<>