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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Single ion dynamics in molten sodium bromide.

O Alcaraz1, F Demmel2, J Trullas1

  • 1Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain.

The Journal of Chemical Physics
|January 3, 2015
PubMed
Summary

This study investigates sodium ion dynamics in molten sodium bromide using neutron scattering and simulations. Simulations with a polarizable model accurately predict experimental sodium diffusion coefficients.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Physical Chemistry

Background:

  • Molten alkali halides are crucial in various industrial applications.
  • Understanding single ion dynamics is key to predicting material properties.
  • Sodium bromide (NaBr) serves as a model system for molten alkali halides.

Purpose of the Study:

  • To investigate the single ion dynamics of sodium ions in molten NaBr.
  • To compare experimental quasielastic neutron scattering data with molecular dynamics simulations.
  • To validate the accuracy of different interatomic potentials for simulating molten salts.

Main Methods:

  • Quasielastic neutron scattering (QENS) was used to measure sodium self-diffusion coefficients at three temperatures.
  • Molecular dynamics (MD) simulations were performed using both rigid and polarizable ion models.
  • Ion diffusion was analyzed via mean squared displacements, velocity autocorrelation functions, and line-width analysis of dynamic structure factors.

Main Results:

  • Experimental self-diffusion coefficients for sodium ions were successfully extracted.
  • MD simulations provided insights into both sodium and bromide ion dynamics and ionic conductivity.
  • Simulations employing a polarizable ion model demonstrated excellent agreement with experimental sodium diffusion coefficients.

Conclusions:

  • The polarizable ion model is highly effective for accurately simulating single ion dynamics in molten NaBr.
  • Combining QENS and MD simulations provides a robust approach to understanding molten salt behavior.
  • This study validates simulation methods for predicting transport properties in ionic liquids.