Abstract
Measurements of the electrical conductivity and tracer diffusion coefficient have been made for a series of XNa 2rmO:(1− X)GeO 2 glasses, where X = 0.01, 0.05, 0.10, 0.15, 0.19 and 0.29. The Haven ratios determined from these measurements show the same trends as earlier work. The dc conductivities of the present study also show the same minimum in sodium ion mobility (at X ∼ 0.09) as found in the earlier studies. The minimum is shown to be an interplay between the pre-exponential and exponential terms. The activation enthalpy remains almost constant for X ⪅ 0.09 and then decreases rapidly with increasing X. These changes can be related to the average GeGe separation which varies little below X ∼ 0.08 but rapidly increases for larger X.
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