Electrical conductivity and relaxation data were measured for glasses of composition 0.242[XKzO+(l -X)Na,O] -0.758Si0, from 25" to 205°C and in the dilute Na+ ion composition range X =0.9 to 1. The decrease in electrical conductivity u when the majority alkali K+ is replaced with the foreign alkali Na+ is most rapid in the very dilute range X =0.98 to 1 and becomes less rapid at larger Na+ contents. The electric field relaxation times agree well with the single-alkali mechanical relaxation times. The electric field relaxation function becomes more exponential with increasing foreign alkali content, indicating a corresponding decrease in the concentration of mobile ions. Attempts to account for the decrease in u with increasing foreign alkali content by assuming that the single-alkali glass is a strong electrolyte and that the foreign alkali complexes with and immobilizes the majority alkali were unsuccessful. Calculated values of the number of majority alkali ions complexed by a foreign-alkali ion were unreasonably large.
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