Significance of activation volumes for cation transport in glassy electrolytes.

Malcolm D. Ingram, Corrie T. Imrie, Ioannis Konidakis, Stephan Voss

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A new model is described for cation transport in glass, in which below T-g a dynamic equilibrium exists between 'open' and 'closed' sites. Cations migrate by hopping into a relatively small number of open sites, which must be just the right size for them to occupy. This model accounts plausibly for the apparent constancy of activation volumes (-RT d lnsigma/dP) in single cation glasses, since the activation volumes are identified with the volumes of the open sites. The effect of increasing the external pressure is to close off some of these sites, thus reducing the number of ions which are free to move. This new approach draws emphasis away from the nature of 'occupied' to 'unoccupied' sites in glass; in this sense it is consistent with the 'dynamic structure model' proposed by Bunde et al.

Original languageEnglish
Pages (from-to)3659-3662
Number of pages4
JournalPhysical Chemistry Chemical Physics
Volume6
Issue number13
Early online date12 Feb 2004
DOIs
Publication statusPublished - 2004

Cite this

Significance of activation volumes for cation transport in glassy electrolytes. / Ingram, Malcolm D.; Imrie, Corrie T.; Konidakis, Ioannis; Voss, Stephan.

In: Physical Chemistry Chemical Physics, Vol. 6, No. 13, 2004, p. 3659-3662.

Research output: Contribution to journalArticle

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abstract = "A new model is described for cation transport in glass, in which below T-g a dynamic equilibrium exists between 'open' and 'closed' sites. Cations migrate by hopping into a relatively small number of open sites, which must be just the right size for them to occupy. This model accounts plausibly for the apparent constancy of activation volumes (-RT d lnsigma/dP) in single cation glasses, since the activation volumes are identified with the volumes of the open sites. The effect of increasing the external pressure is to close off some of these sites, thus reducing the number of ions which are free to move. This new approach draws emphasis away from the nature of 'occupied' to 'unoccupied' sites in glass; in this sense it is consistent with the 'dynamic structure model' proposed by Bunde et al.",
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