Analysis of Interatomic Separation-Pressure Relations for Alkali Halides and Periclase (MgO)

A new method for the determination of interatomic separation-pressure relations is investigated and applied for alkali halides and MgO crystals. The method is developed by using Hildebrand approximation and an ionic model based on Harrison's treatment of overlap repulsive potential which takes into account the interactions up to second neighbors. The van der Waals dipole-dipole and dipole-quadrupole interactions calculated by more accurate methods are also included in the present work. It is found that the new method yield satisfactory results in agreement with the available experimental data.