Dielectric dispersion data for NaCl, KCl, and KBr have been interpreted by considering the interaction between (i) the vacancy-pair dipoles and (ii) the effective charge of the vacancy and the polarized ions in its vicinity (Boswarva and Franklin's formulation of defect pairs). It has been found that the number of vacancy pairs required to explain the dispersion data is less by a factor of 3 or more than that evaluated from Debye's model.
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Chandra et al. (1965) studied this question.
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