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Oxygen ordering and twinning in YBa2Cu3O7-x.

J C Barry1

  • 1Center for Solid State Science, Arizona State University, Tempe 85287-1704.

Journal of Electron Microscopy Technique
|March 1, 1988
PubMed
Summary
This summary is machine-generated.

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Direct structure imaging of YBa2Cu3O7-x (the 1-2-3 compound) reveals insights into oxygen ordering. Lower resolution images are better for studying oxygen ordering, with variations found between crystal grains and regions.

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Superconductivity

Background:

  • YBa2Cu3O7-x, a high-temperature superconductor, exhibits complex oxygen ordering.
  • Understanding oxygen ordering is crucial for optimizing superconducting properties.

Purpose of the Study:

  • To investigate oxygen ordering in YBa2Cu3O7-x using direct structure imaging.
  • To analyze the nature of twin boundaries and their relationship with oxygen ordering.

Main Methods:

  • High-resolution transmission electron microscopy (TEM) for direct structure imaging at 1.7 Å resolution.
  • Analysis of lattice plane bending across twin boundaries to study oxygen ordering.
  • Indexing of a newly discovered phase at twin boundaries.

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Main Results:

  • Lower resolution lattice images are more suitable for studying oxygen ordering in YBa2Cu3O7-x.
  • Significant variations in b/a ratios were observed, correlating with oxygen ordering.
  • Twin boundaries in the orthorhombic phase are sharp and planar, suggesting a martensitic transformation.
  • A new tetragonal phase was discovered at twin boundaries, possibly stabilized by stress.

Conclusions:

  • Oxygen ordering in YBa2Cu3O7-x is heterogeneous within and between grains.
  • The orthorhombic to tetragonal phase transformation likely proceeds via a martensitic mechanism.
  • The newly discovered phase at twin boundaries warrants further investigation.