Abstract
A computer simulation for the ionic movement in glass has been developed in order to explain the decrease of conductivity caused by mixing alkali ions. An account of the composition dependence of the transference number of alkali ions involved is also included. According to the model used, a vacancy in the glass migrates in a three-dimensional path consisting of junctions, terminal and internal sites for alkali ions. It is assumed that the jump of a larger alkali ion into an empty site vacated by a smaller ion is impeded. The consequences of the replacement of alkali ions by protons are also discussed.
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