Enhancement of diffusion of off-center impurities

A. Gordon, S. Dorfman, D. Fuks

Research output: Contribution to journalArticlepeer-review


We show that the Brownian-type motion of the off-center impurity atoms in a double-well potential together with elastic and electrostatic long-range interactions between these atoms and the self-atoms of the lattice may result in enhancement of their diffusion in the host. The crossover occurs from Arrhenius behavior at low temperatures to non-activated motion at high temperatures. Deviations from the Arrhenius law temperature dependence should start at the temperatures when kBT becomes comparable with the relatively low-energy barrier of the double-well potential for the off-center atom. This may explain the experimental fact that at high temperatures the diffusion coefficients for off-center atoms exceed by three or four orders of magnitude, the corresponding self-diffusion coefficients for the motion through the comparatively high-energy barrier between the interstitial positions.

Original languageEnglish
Pages (from-to)336-344
Number of pages9
JournalPhysica B: Condensed Matter
Issue number3-4
StatePublished - May 2003


  • Diffusion
  • Off-center impurities

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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