Title :
High-Tc superconducting glass ceramics based on the Bi-Ca-Sr-Cu-O system
Author :
Komatsu, T. ; Sato, R. ; Imai, K. ; Matusita, K. ; Yamashita, T.
Author_Institution :
Nagaoka Univ. of Technol., Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
Various high-Tc superconducting glass ceramics based on the Bi-Ca-Sr-Cu-O system were prepared by the melt-quenching method. The melt-quenched sample of Bi1.2CaSrCu2O x was found to be a glass that became a high-Tc superconductor with Tc (zero)=85 K by annealing at 820°C. The Bi1-xPbxCaSrCu2 Oy glasses also became high-Tc superconductors upon annealing at temperatures above 800°C. The glass ceramics of Bi0.9Pb0.1CaSrCu2O x exhibited superconductivity with Tc (onset)=116 and Tc (zero)=100 K
Keywords :
annealing; bismuth compounds; calcium compounds; ceramics; high-temperature superconductors; lead compounds; materials preparation; quenching (thermal); strontium compounds; superconducting transition temperature; vitreous state; 100 K; Bi1-xPbxCaSrCu2Oy; annealing; critical temperature; glass ceramics; high temperature superconductor; melt-quenching; preparation; Amorphous materials; Ceramics; Crystallization; Furnaces; Glass; Powders; Rapid thermal annealing; Superconductivity; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
