EFFECTS OF OXYGEN STOICHIOMETRY ON STRUCTURE AND PROPERTIES IN Ba//2YCu//3O//x. .

D. W. Murphy, S. A. Sunshine, P. K. Gallagher, H. M. O'Bryan, Robert Joseph Cava, B. Batlogg, R. B. van Dover, L. F. Schneemeyer, S. M. Zahurak

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

Results of a series of studies on the oxygen stoichiometry in Ba//2YCu//3O//x, 6. 0 less than equivalent to x less than equivalent to 7. 0, are reported. The structure at x equals 7 contains layers of corner-shared, square pyramidal copper and chains of square planar copper. Oxygen is removed from the chains leaving two-fold coordinate copper at x equals 6. Superconductivity is optimal for x approximately equals 7 and for x equals 6 the material is a semiconductor. A valence description ascribes Cu** plus **2 to the Cu in the layers for all x with the Cu in the chains going from Cu** plus **3 at x equals 7 to Cu** plus **1 at x equals 6. A model for twinning based on oxygen defects similar to those in Ba//2YCu//3O//6 is discussed.

Original languageEnglish (US)
Title of host publicationACS Symposium Series
EditorsDavid L. Nelson, M.Stanley Whittingham, Thomas F. George
PublisherACS
Pages181-191
Number of pages11
ISBN (Print)084121431X
StatePublished - Dec 1 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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