Ultrasonic Attenuation in Intermetallics HfX(X=Os, Ir and Pt)

Ultrasonic study of B₂ -structured hafnium based compounds HfX(X=Os, Ir and Pt) along direction were evaluated at room temperature. Initially, the Coulomb and Born-Mayer potential model was used to find out the higher order elastic constants of HfX at room temperature. We have used the second order elastic constants (SOECs) to compute the mechanical properties such as bulk modulus, Young's modulus, shear modulus, Pugh's ratio, Poisson's ratio, Zener anisotropic factor, Vicker's hardness, Lame's modulus of chosen materials. Further, the SOECs and third order elastic constants (TOECs) were applied to compute ultrasonic velocities and Debye temperature. The thermal conductivity and thermal relaxation time of chosen monopnictides compounds have also been computed at room temperature. We have found that HfOs is strongest and most fit material for crystallographic study in B₂ phase. In addition to above evaluated parameters, energy density, specific heat per unit volume, thermal conductivity, acoustic coupling constants and ultrasonic attenuation for longitudinal and shear modes propagation along direction have been estimated. The ultrasonic attenuation was least in case of HfOs. Obtained results have been discussed and justified with available findings for their future prospects.