Abstract
A relationship between the a.c. and d.c. components of ionic conductivity, established for single crystal Na β-alumina, is critically examined. Experimental evidence for a variety of other ionic conductors is reviewed and it is concluded that the relationship is of value for the analysis of the conductivities of ionic conductors in general. It is shown that it is possible to distinguish between conductors in which the mobile ion concentration is thermally activated and those for which it is temperature independent. This analysis reveals a decrease in mobile ion concentration in single crystal samples of Na β-alumina at low temperatures. The determination of ion hopping rates using a.c. conductivity measurements is discussed in detail and the results are compared with those obtained from mechanical relaxation studies.
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