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Electron microscopy of the Pb-Sr-Ca-Er-Cu-O superconductor

Published online by Cambridge University Press:  31 January 2011

R. Ramesh ,
E. Wang ,
L. H. Greene ,
M. S. Hegde ,
J-M. Tarascon  and
Y. Kim
R. Ramesh
Affiliation:
Bellcore, Red Bank, New Jersey 07701-7020
E. Wang
Affiliation:
Bellcore, Red Bank, New Jersey 07701-7020
L. H. Greene
Affiliation:
Bellcore, Red Bank, New Jersey 07701-7020
M. S. Hegde
Affiliation:
Bellcore, Red Bank, New Jersey 07701-7020
J-M. Tarascon
Affiliation:
Bellcore, Red Bank, New Jersey 07701-7020
Y. Kim
Affiliation:
AT & T Bell Laboratories, Holmdel, New Jersey
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Abstract

The structure and microstructure of a solid state processed Pb-Sr-Ca-Er-Cu-O superconductor have been investigated by transmission electron microscopy. In addition to the majority superconducting phase, at least two other impurity phases have been observed. The superconducting phase is a layered structure similar to the Bi2Sr2CaCu2Oy compound, with an extra Cu atom between the two PbO layers. Stacking defects inside the grain have been observed. A grain boundary amorphous phase has also been observed. The steps in the resistivity-temperature plot and the consequent absence of Tc,0 above 8 K are attributed to either the presence of the Pb2Sr2Cu2Oy unit cell at the grain boundary and/or a local enrichment of oxygen at the grain boundaries. Superlattice spots in the [100] zone axis diffraction patterns from regions enriched in Ca and Er with respect to the nominal composition are interpreted as due to ordering of Sr and Ca/Er in the Sr sites.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 2 , February 1990 , pp. 251 - 257
Copyright
Copyright © Materials Research Society 1990

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References

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