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Impact of host phonons on interstitial diffusion.

Chunguang Tang1,2, Gang Sun3, Yun Liu4,5

  • 1Research School of Chemistry, The Australian National University, Canberra, Australia. chunguang.tang@anu.edu.au.

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Summary
This summary is machine-generated.

Host phonons significantly enhance interstitial diffusion, like hydrogen in palladium. Decoupling host atom motion reveals phonon-induced Brownian motion as a key factor in diffusion processes.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Understanding interstitial diffusion is crucial for materials performance.
  • Existing theories often couple host atom and interstitial motion, limiting insight.
  • The specific role of host phonons in interstitial diffusion remains a knowledge gap.

Purpose of the Study:

  • To investigate the effect of host phonons on interstitial diffusion.
  • To decouple the contributions of host atom vibrations and intrinsic interstitial jumps.
  • To elucidate the mechanism by which phonons influence diffusion dynamics.

Main Methods:

  • Molecular dynamics simulations were employed to study hydrogen diffusion in palladium.
  • Host atom motion was selectively pinned to decouple phonon effects.
  • The diffusion coefficient was mathematically separated into intrinsic and phonon contributions.
  • Phonon contributions were modeled using Brownian motion, with temperature-dependent fitting.

Main Results:

  • Palladium phonons were found to significantly promote hydrogen diffusion.
  • The phonon contribution to diffusion exhibits linear temperature dependence at high temperatures and exponential dependence at low temperatures.
  • The total diffusion can be described as intrinsic interstitial jumping combined with phonon-induced Brownian diffusion.

Conclusions:

  • Host phonons play a critical, promoting role in interstitial diffusion.
  • The findings provide a new framework for understanding diffusion, separating intrinsic and phonon-driven components.
  • The generality of these findings was confirmed through simulations of lithium in manganese oxide and carbon in iron.