Analysis of the Dielectric Behaviour of Alkali Halide Crystals

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Abstract
An analysis of the dielectric data at low temperature (2 K) and at room temperature (290 K) is performed for the entire family of NaCl and CsCl structure alkali halide crystals. The recent data on dielectric constants and their pressure and temperature derivatives are used to study the nature of some important physical quantities like the energy gap between bonding and anti‐bonding states, the Phillips‐van Vechten electronegativity parameter and the Szigeti effective charge parameter. Some interesting results are obtained using the Penn model for the electronic dielectric constant and the Lawaetz relation between electronegativity and effective charge parameters.

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