Journal of Pure and Applied Ultrasonics

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Temperature Dependent Acoustical Behaviour of Ir and Rh Metals


Affiliations
1 Department of Physics, B.S.N.V.P.G. College, Lucknow-226001, India
 

The Coulomb and Born-Mayer potential was applied to evaluate the second and third order elastic constants of Ir and Rh metals at 273.2 K, 298.2 K and 373.2 K. The ultrasonic velocity, Debye average velocity, thermal relaxation time and acoustic coupling constant are calculated using the higher order elastic constants and other related parameters. Contribution of these parameters to the total attenuation is studied. It is found that significant contribution to the total attenuation occurs due to phonon-phonon interaction. The attenuation due to thermoelastic loss is negligible compared to phonon-phonon interaction, establishing that the major part of energy from sound wave is removed due to interaction with thermal phonons.

Keywords

Ultrasonic Properties, Thermoelastic Relaxation, Thermal Conductivity, Akhieser Loss.
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  • Temperature Dependent Acoustical Behaviour of Ir and Rh Metals

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Authors

Arvind Kumar Tiwari
Department of Physics, B.S.N.V.P.G. College, Lucknow-226001, India

Abstract


The Coulomb and Born-Mayer potential was applied to evaluate the second and third order elastic constants of Ir and Rh metals at 273.2 K, 298.2 K and 373.2 K. The ultrasonic velocity, Debye average velocity, thermal relaxation time and acoustic coupling constant are calculated using the higher order elastic constants and other related parameters. Contribution of these parameters to the total attenuation is studied. It is found that significant contribution to the total attenuation occurs due to phonon-phonon interaction. The attenuation due to thermoelastic loss is negligible compared to phonon-phonon interaction, establishing that the major part of energy from sound wave is removed due to interaction with thermal phonons.

Keywords


Ultrasonic Properties, Thermoelastic Relaxation, Thermal Conductivity, Akhieser Loss.

References