Pressure dependent conductivities and activation volumes in LixNa(1-x)PO3 glasses: evidence for a new matrix-mediated coupling mechanism in mixed-cation glasses?

P. W. S. K. Bandaranayake, Corrie Thomas Imrie, Malcolm David Ingram

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Ionic conductivities in a range of LixNa(1-x)PO3 glasses are reported as a function of both temperature and pressure. This series of mixed-cation glasses characteristically exhibits minima in glass transition temperatures and in ionic conductivities, and a maximum in the activation energy for ionic conductivity. There is also a maximum in the corresponding activation volume (DeltaV*), where DeltaV*(max) congruent to DeltaV*(Li glass) + DeltaV*(Na glass). It is suggested that this approximate equality is evidence for direct coupling between Li+ and Na+ ion motions, which is mediated through the glass matrix. This coupling process directly influences the mechanism of ion transport in mixed-cation glasses and could be responsible for many features of the mixed-alkali effect.

Original languageEnglish
Pages (from-to)3209-3213
Number of pages4
JournalPhysical Chemistry Chemical Physics
Volume4
DOIs
Publication statusPublished - 2002

Keywords

  • SITE ENERGY-DISTRIBUTION
  • ELECTRICAL-CONDUCTIVITY
  • IONIC-CONDUCTIVITY
  • SILICATE-GLASSES
  • ALKALI GLASSES
  • TRANSPORT
  • NETWORK

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