Phase Equilibria of the Pb-2223 ((Bi:Pb)-Sr-Ca-Cu) High-Temperature Superconductor. Winnie Wong-Ng, Lawrence P. Cook, and W. Greenwood¹, Ceramics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 ¹Geology Department, University of Maryland

Recent research applications of the Bi-Pb-Sr-Ca-Cu-O system emphasize the processing of superconductor wires and tapes. Knowledge of phase equilibria is important for material synthesis, and melt growth of single crystals. For the melting equilibrium studies, we have developed a wicking technique to capture the melt and perform quantitative microchemical analysis. Melt compositions have been obtained for important melting reactions involving five solids. These data allow construction of the multidimensional crystallization fields for various solids in the system.

Discussion will include subsolidus five phase equilibria determined by x-ray diffraction, and the approximate crystallization field of the Pb-2223 phase.