Turkish Journal of Physics
DOI
-
Abstract
Temperature dependence of ultrasonic attenuation due to phonon-phonon interaction and thermo-elastic loss have been studied in (CsCl-type) barium monochalcogenides (BaX, X= S, Se, Te), in the temperature range 50-500 K; for longitudinal and shear modes of propagation along , and directions. Second and third order elastic constants have been evaluated using electrostatic and Born repulsive potentials and taking interactions up to next nearest neighbours. Gruneisen parameters, nonlinearity constants, nonlinearity constants ratios and viscous drag due to screw and edge dislocations have also been evaluated for longitudinal and shear waves at 300 K. In the present investigation, it has been found that phonon-phonon interaction is the dominant cause for ultrasonic attenuation. The possible implications of the results have been discussed.
Keywords
Barium chalcogenides, Ultrasonic attenuation, Phonon-phonon interaction
First Page
211
Last Page
218
Recommended Citation
SINGH, RAJENDRA KUMAR; SINGH, RISHI PAL; SINGH, MANISH PRATAP; and CHAURASIA, SUJEET KUMAR (2008) "Theoretical Analysis of Acoustic Attenuation and Nonlinearity in Barium Monochalcogenides in B2 Phase," Turkish Journal of Physics: Vol. 32: No. 4, Article 5. Available at: https://journals.tubitak.gov.tr/physics/vol32/iss4/5
