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Superionic UO2: A model anharmonic crystalline material.

Hao Zhang1, Xinyi Wang1, Alexandros Chremos2

  • 1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.

The Journal of Chemical Physics
|May 10, 2019
PubMed
Summary
This summary is machine-generated.

Superionic crystalline materials exhibit liquidlike conductivity, crucial for energy applications. This study reveals cooperative motion enhances ion mobility in uranium dioxide (UO2), offering design principles for new superionic materials.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Chemical Engineering

Background:

  • Crystalline materials at high temperatures and pressures can display liquid-like properties.
  • Superionic crystalline materials possess liquid-like ionic conductivity (σ), making them vital for energy technologies like batteries and fuel cells.
  • Uranium dioxide (UO2) is a commercially important reactor fuel and a relevant model system for studying superionic behavior.

Purpose of the Study:

  • To investigate the thermodynamic and structural properties of UO2 under superionic conditions.
  • To quantify structural relaxation, dynamic heterogeneity, and ion mobility in UO2.
  • To elucidate the mechanisms governing ion transport in superionic crystalline materials.

Main Methods:

  • Molecular dynamics simulations were employed to study UO2.
  • Thermodynamic and structural properties were analyzed.
  • Transport properties, including diffusion and structural relaxation times, were quantified.

Main Results:

  • Non-Arrhenius diffusion and structural relaxation in UO2 were successfully modeled using a generalized activated transport ('string') model.
  • The Adam-Gibbs model also effectively described the transport data, linking it to excess entropy and collective motion.
  • Interfacial mobility showed distinct temperature dependence compared to nonionic materials due to cohesive interactions.

Conclusions:

  • Cooperative motion plays a significant role in enhancing ion mobility within ionic materials.
  • The findings provide insights into the behavior of superionic UO2 and offer principles for designing novel superionic materials for energy applications.