Crystal structure and phase transition of PbBaSrYCu3Oy(y=7∼8.4

A. Tokiwa, T. Oku, M. Nagoshi, M. Kikuchi, K. Hiraga, Y. Syono

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Abstract

PbBaSrYCu3Oy prepared by slow cooling, oxygen annealing and quenching methods was studied by XPD, EPMA, HREM and TGA. From a high resolution electron microscopic investigation, the structure of PbBaSrYCu3O7 quenched from above 800°C was found to be a derivative of Pb2Sr2YCu3O8, in which one of the PbO layers in the PbO-Cu-PbO block was missing. The slowly cooled specimen with y{reversed tilde equals}8.2 lost 1.2 oxygen atoms above 580°C with an abrupt and reversible transition to PbBaSrYCu3O7. All of the slowly cooled, oxygen annealed and quenched specimens showed no superconductivity and behaved like a semiconductor.

Original languageEnglish
Pages (from-to)459-467
Number of pages9
JournalPhysica C: Superconductivity and its applications
Volume161
Issue number4
DOIs
Publication statusPublished - 1989 Dec 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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