Abstract
Measurements of the electrical conductivity have been made in a series of x Na 2O: y Al 2O 3: (1 − x − y) GeO 2 glasses where x ≅ 0.01, 0.05, 0.10, 0.15, 0.22 and 0.29 and y x ≅ 0.033 and 1.0. The dc conductivities of the rubidium germanate glasses show a minimum in rubidium ion mobility at x ≅ 0.1 that is a result of a maximum in the activation enthalpy for ion migration. Above x ⩾ 0.1 the activation enthalpies appear to be related to the packing density of the network forming ions. The preexponential factors for the conductivity are used to determine relative values of the physical correlation factor. The changes in the physical correlation factor with the rubidium-rubidium spacing suggest that as the spacing decreases ordering sets in and ƒ I is reduced.
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