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Structure conductivity correlation in reverse Monte Carlo models of single and mixed alkali glasses

Authors
Journal
Solid State Ionics
0167-2738
Publisher
Elsevier
Publication Date
Volume
175
Identifiers
DOI: 10.1016/j.ssi.2004.08.038
Keywords
  • Ion Conducting Glasses
  • Bond Valence
  • Reverse Monte Carlo Modeling
  • Mixed Alkali Effect

Abstract

Abstract The correlation between the local structure of alkali glasses and their ionic conductivity is investigated by a bond valence analysis of reverse Monte Carlo (RMC) fits to experimental diffraction data. Our previously detected general relation between the volume fraction of the transport pathways and their ionic conductivity also permits to reproduce the mixed alkali effect and provides further insight into its structural origin. The drastic drop of the conductivity is mainly caused by the blocking by immobile unlike cations, which is highly effective due to the low dimensionality of the pathways on local length scales. Factors that affect the pathway dimensionality are discussed. The evolution of the transport pathways in time is studied by applying the BV approach to entire molecular dynamics trajectories.

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