Temperature Variation of Anharmonic Properties of Thorium Sulphide

For thorium sulphide; the elastic energy density is expanded as a power series of strains using Taylor series expansion starting from nearest neighbour distance and hardness parameter using Coulomb and Born-Mayer potentials for obtaining higher order elastic constants. The higher order elastic constants for a crystal are useful for obtaining the anharmonic properties of crystal within the limit of the continuum approximation in a quantitative manner. Thorium sulphide crystal possesses face centered crystal structure. For obtaining anharmonic properties, the second, the third and the fourth order elastic constants of thorium sulphide crystal at elevated temperature are computed. These elastic constants are used to evaluate their pressure derivatives. The results have been discussed with available findings.