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Oxygen Self-Diffusion in Volume and in Grain-Boundaries of Cu2−x O

  • F. Perinet
  • J. Le Duigou
  • C. Monty
Part of the NATO ASI Series book series (ASIC, volume 276)

Abstract

Oxygen self-diffusion has been measured both in the bulk and in grain-boundaries of Cu2−x O as a function of temperature T (712°C–1100°C) and oxygen partial pressure, PO2(10−7–0.21 atm). The measured diffusion coefficients can be described by the expressions
$${D_0}\left( {c{m^2}{s^{ - 1}}} \right) = 2.2\,{10^{ - 3}}{P_{02}}{\left( {atm} \right)^{0.48 \mp 0.2}}\exp \left[ {\frac{{ - 1.46 \mp 0.18\left( {eV/at} \right)}} {{kT}}} \right]$$
in the bulk and
$${D'_0}\left( {c{m^2}{s^{ - 1}}} \right) = 8.\,13\,{10^{ - 2}}{P_{02}}{\left( {atm} \right)^{0.59 \mp 0.18}}\exp \left[ { - \frac{{ - 1.0 \mp 0.45\left( {eV/at} \right)}} {{kT}}} \right]$$
in grain-boundaries (if grain-boundary thickness δ = 1 nm). These results indicate that the same main defect, a neutral oxygen interstitial 0<Stack><Subscript>x</Subscript><Superscript>i</Superscript></Stack>, is responsible for the diffusion of oxygen both in the bulk and in grain-boundaries and that the sum of the formation and migration enthalpies for 0<Stack><Subscript>x</Subscript><Superscript>i</Superscript></Stack> is 1.5 eV in the bulk and around 1 eV in grain-boundaries.

Keywords

Point Defect Diffusion Profile Oxygen Sublattice Measured Diffusion Coefficient Neutral Oxygen 
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

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • F. Perinet
    • 1
  • J. Le Duigou
    • 1
  • C. Monty
    • 1
  1. 1.Laboratoire de Physique des MatériauxCNRSMeudon CedexFrance

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