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Neutron powder diffraction and molecular dynamics study of superionic SrBr2.

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|October 22, 2013
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Summary

Strontium bromide exhibits dynamic ionic disorder in its superionic phase, with bromide ions rapidly diffusing via hops. This study reveals insights into anion diffusion and ionic size effects in superionic conductors.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Superionic conductors exhibit high ionic conductivity.
  • Strontium bromide (SrBr2) is a unique superionic conductor featuring bromide (Br(-)) ion conduction.
  • Understanding ionic disorder is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the dynamic ionic disorder in the superionic phase of strontium bromide (β-SrBr2).
  • To elucidate the mechanism of anion diffusion and cation-anion interactions.
  • To compare the ionic disorder with the ordered phase and other superionic materials.

Main Methods:

  • Neutron powder diffraction data analyzed using reverse Monte Carlo (RMC) modeling.
  • Ab initio molecular dynamics (MD) simulations.
  • Analysis of ionic trajectories and coordination environments.

Main Results:

  • RMC and MD simulations showed good agreement, confirming extensive dynamic disorder in the Br(-) sublattice.
  • Anion diffusion occurs primarily through nearest-neighbor hops along 〈100〉 directions with curved trajectories.
  • Correlated Br(-) motion leads to transient square antiprism coordination around Sr(2+).

Conclusions:

  • The study clarifies the nature of dynamic ionic disorder in β-SrBr2.
  • Findings highlight the role of anion size in superionic conductivity.
  • The observed phenomena provide insights into the behavior of superionic materials.