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Structural evolution in lead substituted Bi–Sr–Ca–Cu–O superconductors

Published online by Cambridge University Press:  31 January 2011

R. Ramesh
Affiliation:
Bellcore, Red Bank, New Jersey 07701
K. Remschnig
Affiliation:
Bellcore, Red Bank, New Jersey 07701
J.M. Tarascon
Affiliation:
Bellcore, Red Bank, New Jersey 07701
S.M. Green
Affiliation:
Center for Superconductivity Research, Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20752
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Abstract

The structural evolution and cationic stoichiometry of Bi(Pb)–Sr–Ca–Cu–O superconductors have been studied using transmission electron microscopy and x-ray microanalysis. The nature of the incommensurate modulation changes systematically as increasing amounts of lead are added. X-ray microanalysis studies reveal that lead replaces Bi in the structure. Pb addition improves the microstructural homogeneity leading to the formation of a nearly homogeneous sample consisting of the “2223” phase. Based upon all the experimental results, it is inferred that the role of Pb substitution is related to the thermodynamics and kinetics of the formation of the n = 3 phase.

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Copyright
Copyright © Materials Research Society 1991

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