Order-disorder in YBa2Cu3O7

L. D. Marks, J. P. Zhang, S. J. Hwu, Kenneth R Poeppelmeier

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We summarize here results of a fairly detailed study by high-resolution electron microscopy and electron diffraction of the high-temperature superconductor YBa2Cu3O7-δ. Data from the perfect structure for (100), (110), and (001) zones indicate that the material has an oxygen-deficient perovskite structure as previously reported from X-ray and neutron diffraction studies. In some cases planar defects along (001) directions were observed. A more important observation is the existence of a phase with disorder of the Y and Ba ion positions and of an additional amorphous phase. The perfectly ordered (defect-free) phase grows from the disordered material, and the planar defects are probably due to mechanical deformation during preparation of the material. These defects probably are not related to the superconducting properties, as recently suggested. The conclusions are consistent with the commonly encountered problems in the preparation of superconductors in high yields.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalJournal of Solid State Chemistry
Volume69
Issue number1
DOIs
Publication statusPublished - 1987

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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