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The Localization Model accurately predicts a parameter-free relationship between atomic dynamics, structural relaxation time, and oxygen ion diffusion in crystalline uranium dioxide under superionic conditions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Superionic conditions in crystalline UO2 involve significant anharmonic interactions.
  • These interactions lead to non-Arrhenius relaxation and high ion mobility.
  • Previous studies showed the Localization Model's utility in metallic glasses.

Purpose of the Study:

  • To validate the Localization Model's prediction of a parameter-free relationship.
  • To investigate the connection between alpha-structural relaxation time (τ_α), oxygen ion diffusion (D_O), and the Debye-Waller factor (⟨u²⟩).
  • To assess the model's applicability under superionic conditions in UO2.

Main Methods:

  • Simulations of crystalline UO2 under varying temperatures and pressures.
  • Analysis of atomic dynamics, specifically picosecond-scale beta relaxation.
  • Testing the predicted parameter-free relationship against simulation data.

Main Results:

  • The Localization Model's predicted relationship holds to an excellent approximation.
  • The parameter-free correlation between fast beta relaxation and long-time dynamics was confirmed.
  • The findings are consistent across the investigated range of temperatures and pressures.

Conclusions:

  • The Localization Model successfully describes the relationship between atomic dynamics and ion diffusion in UO2.
  • The parameter-free nature of the LM relationship is robust, even under extreme conditions.
  • This study validates the LM for predicting ion transport properties in complex materials.