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Primary Phase Field of the Pb-Doped 2223 High Tc Superconductor in the (Bi,Pb)-Sr-Ca-Cu-O System



Winnie K. Wong-Ng, Lawrence P. Cook, Anthony J. Kearsley, W Greenwood


Both liquidus and subsolidus phase equilibrium data are of central importance for applications of high temperature superconductors in the (Bi,Pb)-Sr-Ca-Cu-O system. The subsolidus equilibria of the 110K high Tc Pb-doped 2223 ((Bi,Pb),Sr,Ca,Cu) phase and the location of the primary phase field have been determined. A wicking technique was developed to capture the melt for quantitative microchemical analysis. A total of 29 five-phase volumes that include the 2223 phase as a component were obtained. The initial melt compositions of these volumes range from a mole fraction of 7.3% to 28.0% for Bi, 11.3% to 27.8% for Sr, 1.2% to 19.4% for Pb, 9.8% to 30.8% for Ca, and 17.1% to 47.0% for Cu. The crystallization field for the 2223 phase was constructed using the convex hull technique. A multifaceted polytope can be used to describe the outline of the primary phase field.
Journal of Research (NIST JRES) -
104 No. 3


BSCCO, high Tc superconductor, pb-doped 2223, phase equilibria, primary phase field


Wong-Ng, W. , Cook, L. , Kearsley, A. and Greenwood, W. (1999), Primary Phase Field of the Pb-Doped 2223 High Tc Superconductor in the (Bi,Pb)-Sr-Ca-Cu-O System, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 18, 2024)
Created July 23, 1999, Updated February 17, 2017