Thermal Properties of Ta–W Alloys

Abstract

The phonon dispersion, frequency distribution, Debye θ and the elastic constants of Ta–W alloys have been investigated using the deLauney angular force (DAF) model. The central force constants have been considered up to third neighbours while the angular force constants are operative up to two neighbours. It has been found that the third neighbour interaction is very weak in Ta–W alloys. The angular forces are quite important for the second neighbours. The phonon frequencies, Debye θ and the elastic constants exhibit a good agreement with the experimental values.