“…Among the applications of this model, we refer here to the most recent ones: first, Katsika-Tsigourakou and Vassilikou-Dova [20] by making use of the compressibility [21] of the defect volume [22][23][24] predicted by the cB model, achieved in calculating the bulk modulus of a mixed alkali halide crystal in terms of the compressibility of the pure constituents. Second, the same authors [25] relying on an interconnection between the ionic polarizability and the bulk modulus [26,27], recently showed [25] that the considerable temperature increase of the static dielectric constant can be accounted for.…”