Abstract
For ionic crystals of NaCl and CsCl structures, the volume dependence of the effective ionic charge ( d ln s d ln V ) defined by the second Szigeti relation is calculated using low temperature experimental data. The need for experimental data of γ T at T→ 0°K is remarked upon. ( d ln s d ln V ) obtained independently with a deformation dipole model and a simple shell model. The results are compared. All models tend to give positive values of ( d ln s d ln V ), as expected.
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