Abstract
Measurements of the a.c. conductivity of AgIAg 2 MoO 4 glass over the temperature range − 84 to − 154°C have enabled d.c. conductivities and ion hopping rates to be obtained. The ion hopping rate values have been confirmed by mechanical relaxation measurements at two frequencies, 1.25 and 10 MHz. The anomalously high conductivity prefactor, 6.3 × 10 5 ohm −1 cm −1 K, is associated with a large entropy, S, of activation. A simple relationship between S and activator energy, E, proposed by Dienes, is shown to hold for a range of glassy Ag + conductors whereas the Wert and Zener expression seriously underestimates S, as shown by shear wave velocity and thermal expansion measurements.
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