Abstract
The densities, refractive indices, thermal expansions, hardnesses and electrical properties of mixed alkali fluoride glasses of composition 40ZrF 4 · 20PbF 2 · 10AlF 3 · 30RF, where RF are the LiF-NaF, LiF-KF and NaF-KF pairs, have been measured and those and derived properties have been discussed in terms of the mixed alkali effect. It is found that the density, refractive index, molar volume, molar refractivity, thermal expansion coefficient and glass transition and softening temperatures do not exhibit the appreciable mixed alkali effect, while the electrical conductivity and dielectric loss show the appreciable mixed alkali effect as observed in silicate and other oxide glasses. It is found that there is a small mixed alkali effect in Vickers hardness. The magnitude of the mixed alkali effect in electrical conductivity and dielectric loss is larger when the difference of the activation energy for conduction between two constituent single alkali glasses is larger.
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