Effect of Lundqvist's many-body potential on the photoelastic behavior of ionic crystals

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Abstract
A theoretical model for evaluating the photoelastic effect, i.e., the strain derivative of the electronic dielectric constant, under the influence of hydrostatic pressure in ionic crystals has been developed. The model takes account of the effect of the many-body potential introduced by Lundqvist. Application of the model to alkali halides and MgO yields values of the strain derivatives of the electronic dielectric constants which are in good agreement with experimental data.