Due to the highly anisotropic behaviour from the resulting formula, it is interesting to determine its elastic waves by obtaining the information from the set of cubic elastic constants. The cubic symmetry of corresponding alloys certifies that pure modes of elastic waves can exists in [100], [110] and [111] directions. The respective phase velocity and longitudnal along with transverse velocity sre calcaled in these directions and are displayed in Table 4 . These quatites are helpful in predicting the Debye temperature by classical method using mean sound velocity [39]. The Debye temperature (θD ) of a material for both the compounds can be projected as: