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Pb-Distribution in a Five-Phase (Bi, Pd)-Sr-Ca-Cu-O Assemblage

Published

Author(s)

Lawrence P. Cook, Winnie K. Wong-Ng

Abstract

The partitioning of lead between phases in the nominal five-phase assemblage: (Pb,Bi)3Sr2Ca2CuOx + (Ca,Sr)2PbO4 + (Bi,Pb)2Sr2CaCu2Ox + (Ca,Sr)O + Liquid has been investigated in an atmosphere of 7.5% O2925% Ar. Samples were studied using a combination of high temperature quenching, simultaneous differential thermal analysis and thermogravimetric analysis, scanning electron microscopy, and energy dispersive x-ray analysis. Results indicate a strong partitioning of lead relative to bismuth into the (Pb,Bi)3Sr2Ca2CuOx and (Ca,Sr)2PbO4 phases, for which the average Pb/(Pb + Bi) ratios were determined to be 0.73 and 0.85, respectively. In the (Bi,Pb)2Sr2CaCu2Ox and Liquid phases, the average Pb/(Pb + Bi) ratios were much lower, 0.14 and 0.24, respectively. This indicates an apparent saturation of Pb in the (Bi,Pb)2Sr2CaCu2Ox superconductor at a relatively low level. Data on Sr/(Sr+Ca) ratios for coexisting phases are also presented, along with a thermodynamically-derived projection of the 5-component data for the coexisting phases.
Proceedings Title
Proceedings Of ACerS
Volume
84
Conference Dates
May 1, 1997
Conference Title
ACerS

Keywords

BSCCO, five phase assemblage, high Tc superconductors, lead distribution, phase equilibria

Citation

Cook, L. and Wong-Ng, W. (1998), Pb-Distribution in a Five-Phase (Bi, Pd)-Sr-Ca-Cu-O Assemblage, Proceedings Of ACerS (Accessed May 19, 2024)

Issues

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Created March 12, 1998, Updated February 19, 2017