Abstract
Ionic conductivity measurements have been made as a function of temperature and Na/Rb ratio on six series of x(Na, Rb) 2O: yAl 2O 3:(1- x- y)GeO 2 glasses where (1- x- y)=0.9, 0.8,and0.7 and y/ x=0.33 and 1.0. The three series with x⩾0.15 exhibit the common characteristics of mixed alkali glasses; a maximum in the enthalpy for conductivity, H m, for glasses with Na/ (Na+Rb)≌0.4. No maximum in H m was observed in glasses with x≤0.1. The pre-exponential factors for the conductivity are analyzed to obtain relative values of the physical correlation factor or percolation efficiency, ƒ I. The relative values of ƒ I show a maximum at Na/(Na+Rb)≌0.5 for each of the glass series. An explanation for the mixed alkali effect is given in terms of the temperature dependence of ƒ I.
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