Preparation and Crystallization Process of the High-Tc Superconducting Phase (Tc(end)>100 K) in Bi, Pb-Sr-Ca-Cu-O Glass-Ceramics

A high-T c superconducting phase (T c(end)>100 K) in Bi, Pb-Sr-Ca-Cu-O glass-ceramics was prepared by conventional melt-quenching and annealing techniques. No crystalline phase could be detected in the as-quenched specimens, but annealing for crystallization was necessary to observe the superconducting transition. This report investigates the appropriate amount of PbO in the starting materials for observing the high-T c phase and crystallization process. The highest T c(onset) and T c(end) were 120 K and 102 K, respectively.