The self-diffusion coefficient of the lithium ion in cubic lithium sulphate has been measured from 640 to 790°C. From electrical conductivity and electromigration experiments it has been found that several cations are moving in phase and the mean value of the number of ions in each group has been estimated to be about 2.0. The measurements of the self-diffusion coefficient indicate that we also have transport mechanisms, which contribute more to the diffusion than to the electrical conduction.

The diffusion coefficients of the divalent ions Mg, Zn, Ca, Cd and Pb have been measured between 600 and 800°C. The results can be described by an Arrhenius equation, where the preexponential factors decreases when the radius of the diffusing ion increases. By comparing results for univalent and divalent ions we have found that the formation energy is constant and that the migration energy decreases when the cation radius increases.

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