Ultrasonic Interactions with Microstructural Defects in Platinum Group Metal Nitrides

The ultrasonic and thermophysical properties of the platinum group metal nitrides (PGMNs) osmium nitride, iridium nitride and platinum nitride were scrutinised along <100>, <110> and <111> orientations at room temperature. In the present work, we evaluate the second, third and fourth order elastic constants (SOECs, TOECs and FOECs) of the PGMNs in the temperature span 0–500 K using the Coulomb and Born-Mayer potential model. At T = 0 K, the mechanical properties of the PGMNs were investigated for potential industrial applications. The ultrasonic wave velocity and other thermophysical parameters have been determined to evaluate the thermal performance of the chosen materials along the <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.

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