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A computational study on the superionic behaviour of ThO2.

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This study reveals that Thorium dioxide (ThO2) exhibits anionic conductivity in its superionic state due to lattice expansion and phonon mode softening. Anion migration primarily occurs in the <001> direction via a hopping mechanism.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Computational Chemistry

Background:

  • Thorium dioxide (ThO2) is a material with potential applications requiring high ionic conductivity.
  • Understanding its superionic behavior is crucial for optimizing its performance in such applications.

Purpose of the Study:

  • To investigate the lattice dynamics, mechanical properties, and anionic transport mechanisms of ThO2 in the superionic state.
  • To elucidate the relationship between lattice expansion, phonon behavior, and ionic conductivity.

Main Methods:

  • Density Functional Theory (DFT) calculations for phonon frequencies and lattice dynamics.
  • Classical Molecular Dynamics (MD) simulations for anionic transport and diffusion barriers.
  • Nudged Elastic Band (NEB) calculations to determine migration pathways.

Main Results:

  • Lattice expansion leads to softening of B1u and Eu phonon modes, with a mode crossing at ε = 0.03.
  • Anionic conductivity in the <001> direction is indicated by phonon mode behavior and confirmed by MD and NEB calculations.
  • The B1u phonon mode becomes imaginary at 3430 K, signifying anionic disorder in the superionic state.
  • ThO2 remains elastically stable up to the superionic regime.

Conclusions:

  • The superionic state in ThO2 is characterized by anionic disorder driven by lattice expansion and specific phonon mode softening.
  • Anion migration follows a hopping mechanism between tetrahedral and octahedral interstitial sites, predominantly along the <001> direction.
  • DFT and MD simulations provide a comprehensive understanding of the factors governing ionic transport in ThO2.