Energy parameters of cation motion in alkali halides as determined by dielectric relaxation measurements

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Abstract
Energy parameters for the motion of a cation into an adjacent vacancy when both are in the vicinity of a divalent cation impurity have been determined more accurately than previously from dielectric measurements on three of the more commonly investigated alkali halides, LiF, NaCl and KCl. There is good agreement with the best recent determinations of the parameters for the motion of a cation into an adjacent cation vacancy as determined by DC electric conductivity measurements. Differences in activation enthalpies between the two methods of measurement are less than 2%. Measurements on NaI:Ca2+ have been included also in this programme because of a relatively large discrepancy between the enthalpy determined earlier by dielectric absorption and that determined more recently by other methods.