Abstract
An argument is presented that, for isolated point defects migrating in an ionic crystal, there should be no Hall effect to first order. This is a result of the fact that the jumping ion cannot be deflected without a change in its energy. In most (but not all) of the Hall experiments on superionic conductors, however, there are reports of Hall signals for which the Hall mobility is found to be equal to the drift mobility. Possible reasons for this are presented. Recent experimental results of Liou et al, in which a Hall mobility equal to the drift mobility was observed for AgI but not for AgBr, are consistent with the present argument.
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