Sound Attenuation at High Temperatures in Pt

• Authors: R Singh , K Pandey
• Languages of publication: EN

Abstracts

EN

Ultrasonic attenuation due to phonon-phonon interaction and thermoelastic loss was evaluated in VIII group transition metal Pt in a wide temperature range (100 K to 1500 K) for longitudinal and shear waves along〈100〉, 〈110〉 and〈111〉 directions and for shear waves polarised along different directions. Electrostatic and Born-Mayer potentials were used to obtain second and third order elastic constants, taking nearest-neighbour distance and hardness parameter as input data. Second and third order elastic constants data obtained at different temperatures were used to obtain Gruneisen parameters and non-linearity or anisotropy parameters which in turn were used to evaluate (α/f^2)_l and (α/f^2)_s in Akhiezer regime. The results were discussed and it was found that at lower temperatures (α/f^2) increases rapidly with temperature and then rate of increase becomes very small. Contribution to the total attenuation due to thermoelastic loss is negligible so that due to phonon-phonon interaction establishing that major part of energy from sound wave is removed due to interaction with thermal phonons (lattice vibrations).

Keywords

EN

62.20.Dc; 62.65.+k

Discipline

• 62.65.+k: Acoustical properties of solids

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 109
• Issue: 2
• Pages: 219-228

Dates

published

2006-02

received

2005-10-04

Contributors

author

R Singh

• H.C.P.G. College, Varanasi-221001, U.P., India

author

K Pandey

• H.C.P.G. College, Varanasi-221001, U.P., India

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Identifiers

DOI

10.12693/APhysPolA.109.219