Abstract
The importance of temperature effects in the use of the second Szigeti relation to calculate the volume dependence of the effective ionic charge of cesium halide crystals is studied. The effect obtained is larger than the one for alkali halide crystals of the NaCl structure. Positive values of (∂ ln s/∂ In v) are obtained using low temperature experimental data with the Grüineisen parameter γ t ( T → 0K) calculated using the generalized first Szigeti relation. Values of γ t are also obtained with a rigid ion model and they differ little from the previous ones.
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