, Volume 9, Issue 1–2, pp 28–35 | Cite as

Structure-conductivity relations in ion conducting glasses

  • J. Swenson
  • St. Adams


The bond valence method has been applied to reverse Monte Carlo (RMC) produced structural models of a wide range of ion conducting glasses in order to elucidate the relation between the microscopic structure and the ionic conductivity. Our approach allows us to predict the ionic conductivity of the glasses directly from the “pathway volume” of the structural models and to investigate the nature of these low-dimensional conduction pathways. The pathways are defined to be the regions in the structural models where the valence mismatch for each mobile ions remains below a given threshold value. The results for the metal-halide doped glasses show the importance of including M+ sites with a high oxide coordination for the long range mobility, responsible for the dc conductivity. Thus, there are no long range migration pathways for M+ sites in an entire halide environment. Rather, the mobile ions are generally moving between sites with a local environment of both oxygens and halide ions, in contrast to earlier proposed “cluster models” where it has been assumed that cations associated with salt clusters are responsible for the high ionic conductivity. Finally, our bond valence approach provides a direct explanation for why the conductivity is favoured by highly polarizable anions and cations, since the pathway volume is related to the softness of the M+-X bond.


Ionic Conductivity Halide Bond Valence High Ionic Conductivity Dope Glass 
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Copyright information

© IfI - Institute for Ionics 2003

Authors and Affiliations

  • J. Swenson
    • 1
  • St. Adams
    • 2
  1. 1.Department of Applied PhysicsChalmers University of TechnologyGöteborgSweden
  2. 2.GZG, Abt. KristallographieUniversität GöttingenGöttingenGermany

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