An attempt has been made to estimate the field dependence of the electric susceptibility of simple ionic crystals by considering a linear chain of alternating positive and negative ions interacting only through nearest neighbors. The pressure and temperature dependence have also been included to compare with experiment and thereby to give some indication of the reliability of the model. It is found that the dependence on all three parameters is directly related to the anharmonicity in the vibrational motion.
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F. Ninio (1962) studied this question.
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