Size Dependent Acoustical Properties of bcc Metal

• Authors: R. Yadav , D. Pandey
• Languages of publication: EN

Abstracts

EN

The ultrasonic attenuation is evaluated at 300 K along [100], [110], and [111] directions for the characterization of bcc metal Ta. The size of the metal is considered in nanorange. Ultrasonic velocity, Grüneisen parameter and acoustic coupling constant that depend on second and third order elastic constants are calculated for determination of ultrasonic attenuation coefficient. Second and third order elastic constants of the bcc metal Ta at nanoscale at 300 K are also calculated starting with only two basic parameters. For the information about defects at nanoscale, the dislocation drag coefficients are calculated for the metal at different size along [100] orientation. The ultrasonic attenuation increases with the size of material as the size variation of the thermal conductivity and the thermal relaxation time. There is significant increase in the attenuation up to 150 nm.

Keywords

EN

62.20.Dc; 62.65.+k; 63.20.Kr

Discipline

• 62.65.+k: Acoustical properties of solids

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 107
• Issue: 6
• Pages: 933-946

Dates

published

2005-06

received

2004-12-13

(unknown)

2005-04-06

Contributors

author

R. Yadav

• Physics Department, Allahabad University, Allahabad-211002, India

author

D. Pandey

• Physics Department, Allahabad University, Allahabad-211002, India

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Identifiers

DOI

10.12693/APhysPolA.107.933