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Related Experiment Videos

Small isotope effect of diffusion in disordered structures.

N P Lazarev1, A S Bakai, C Abromeit

  • 1NSC Kharkov Institute of Physics and Technology, Akademichna 1, 61108 Kharkov, Ukraine. n.lazarev@kipt.kharkov.ua

Physical Review Letters
|January 22, 2002
PubMed
Summary

The isotope effect in diffusion decreases with increasing lattice disorder. This phenomenon is linked to percolation and reduced dimensionality for diffusing particles.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Physics

Background:

  • Diffusion mechanisms in solids are crucial for material properties.
  • Lattice disorder can significantly alter atomic transport phenomena.
  • The isotope effect quantifies mass-dependent diffusion rates.

Purpose of the Study:

  • To investigate the isotope effect (E) in a single jump vacancy diffusion model.
  • To understand how static lattice disorder influences the isotope effect.
  • To explore the underlying physical mechanisms responsible for observed changes in E.

Main Methods:

  • Utilized Monte Carlo simulations to model diffusion in disordered lattices.
  • Simulated a single jump vacancy diffusion mechanism.

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  • Systematically varied the degree of static disorder in the lattice.

    • Main Results:

    • Observed a significant decrease in the isotope effect (E) as lattice disorder increased.
    • Demonstrated a strong correlation between increasing disorder and reduced isotope effect.
    • Identified percolation processes as a key factor influencing the isotope effect.

    Conclusions:

    • Static lattice disorder substantially diminishes the isotope effect in vacancy diffusion.
    • Percolation phenomena and the reduction of effective dimensionality explain the observed decrease in E.
    • Results provide insights into diffusion dynamics in non-ideal crystalline materials.