• Distribution of ionic charge carriers and migration barriers in binary alkali silicate glasses

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    • Keywords


      Alkali ions; Silicate glasses; migration energy barriers; Spatial distribution; activation energies; non-bridging oxygen ions

    • Abstract


      Likely spatial distributions of network-modifying (and mobile) cations in (oxide) glasses are discussed here. At very low modifier concentrations, the ions form dipoles with non-bridging oxygen centres while, at higher levels of modification, the cations tend to order as a result of Coulombic interactions. Activation energies for cation migration are calculated, assuming that the ions occupy (face-sharing) octahedral sites. It is found that conductivity activation energy decreases markedly with increasing modifier content, in agreement with experiment.

    • Author Affiliations


      K J Rao1 2 S R Elliott1 3

      1. Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge - CB2 1EW, UK
      2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560 012, India
      3. Laboratoire de Science des Materiaux Vitreux, Universite de Montpellier II, Place-Eugene Bataillon, Montpellier Cedex - 34095, France
    • Dates

  • Journal of Chemical Sciences | News

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