Determining the inter-ionic potentials in MgO, CaO and SrO crystals phenomenologically, we have found that the affinity of the O - ion has different value in each crystal. Using these potentials we have computed the formation energy of the Schottky defect in these crystals and found that the results are reasonable. Finally we tried to explain the deviation from Cauchy-relations in MgO by Lowdin's many-body forces.
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Yamashita et al. (1954) studied this question.
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