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Electron Irradiation Effects in YBa2Cu3O7_δ Single Crystals

  • M. A. Kirk
  • M. C. Baker
  • J. Z. Liu
  • D. J. Lam
  • H. W. Weber

Abstract

Defect structures in YBa2Cu3O7_δ produced by electron irradiation at 300 K, were investigated by transmission electron microscopy. Threshold energies for the production of visible defects were determined to be 152 keV and 131 keV (± 7 keV) in directions near the a- and b-axes, respectively (b > a, both perpendicular to c, the long axis in the orthorhombic structure) During above — threshold irradiations in an electron flux of 3 × 1018 cm−2s−1, extended defects were observed to form and grow to sizes of 10–50 nm over 15 minutes, in material thicknesses varying between 20 and 200 nm. Upon irradiation between the a- and b-thresholds, movement of twin plane boundaries and shrinkage of twinned volume were observed. All these findings suggest oxygen atom displacements in the basal plane with recoil energies near 20 eV. Above — threshold irradiations also show the collapse of c-axis long range order into a planar faulted defect structure with short range order peaks at 1.2 c and 1.07 c, depending on the irradiation direction.

Keywords

Threshold Energy Twin Boundary Electron Flux Recoil Energy Defect Production 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • M. A. Kirk
    • 1
  • M. C. Baker
    • 1
  • J. Z. Liu
    • 1
  • D. J. Lam
    • 1
  • H. W. Weber
    • 2
  1. 1.Materials Science DivisionArgonne National LaboratoryArgonneUSA
  2. 2.Atominstitut der österreichischen UniversitätenWienAustria

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