Abstract
The cohesive and anharmonic elastic properties of four mixed fluorite crystals (CaxSr1−xF2, SrxBa1−xF2 BaxCa1−xF2 and CdxPb1−x F2) have been investigated by means of a three-body potential (TBP) model which consists of the long-range Coulomb and three-body interactions and the short-range van der Waals attraction and overlap repulsion effective up to the second-neighbour ions. Due to the lack of measured data on cohesive energy, third-order elastic constants and pressure derivatives of the secondorder elastic constants of mixed fluorites, the accuracy of the present results has been tested by comparing them with the so-called experimental results generated by the application of Vegard’s law to their corresponding experimental values for the host fluorites.
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