oa Ultrasonic Interactions with Microstructural Defects in Platinum Group Metal Nitrides OsN, IrN and PtN

The ultrasonic and thermophysical properties of the platinum group metal nitrides (PGMNs) OsN, IrN and PtN were scrutinized along <100>, <110> and <111> orientations at room temperature. In present work, we evaluate the second, third, and fourth-order elastic constants of the PGMNs in the temperature span 0–500K using Coulomb and Born-Mayer potential model. At T=0K, the mechanical properties of PGMNs were investigated for the futuristic execution and industrial applications. The ultrasonic wave velocity and other thermophysical parameters have been determined to evaluate the thermal performance of the chosen materials along <100>, <110> and <111> orientations. The ultrasonic attenuation resulting from both the phonon-viscosity mechanism and the thermoelastic relaxation mechanism was calculated for three different orientations at room temperature. These calculated results were then analysed and compared with provided data on the selected materials and similar material types.