Ultrasonic Attenuation in NbO at Higher Temperature Phase

Ultrasonic attenuation for the longitudinal and shear waves due to phonon-phonon interaction and thermoelastic mechanism have been evaluated in NbO along <100> and <111> crystallographic directions in the temperature range 100-500K. The second-and third order elastic constants are also evaluated for the evaluation of ultrasonic attenuation and other associated parameters like Grüneisen parameters and acoustic coupling constants. The ultrasonic attenuation due to phonon-phonon interaction is predominant over thermoelastic loss in this material. The obtained results are discussed in correlation with thermoelastic properties of NbO.