Electron Microscopy of the Pb-Sr-Ca-Er-Cu-O Superconductor

R. Ramesh, E. Wang, L. H. Greene, M. S. Hegde, J. M. Tarascon

Research output: Contribution to journalArticlepeer-review


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 been observed. The steps in the resistivity-temperature plot and the 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 due to ordering of Sr and Ca/Er in the Sr sites.

Original languageEnglish (US)
Pages (from-to)251-257
Number of pages7
JournalJournal of Materials Research
Issue number2
StatePublished - Feb 1990
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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