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- Title
Acoustic wave propagation in barium monochalcogenides in the B1 phase.
- Authors
Singh, R. K.; Singh, Rishi Pal; Singh, M. P.; Chaurasia, S. K.
- Abstract
Temperature dependence of ultrasonic attenuation due to phonon-phonon interaction and thermoelastic loss have been studied in (NaCl-type) barium monochalcogenides [BaX, X = S, Se, Te], in the temperature range 50–500 K; for longitudinal and shear modes of propagation along 〈100〉, 〈110〉, 〈111〉 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 results have been discussed.
- Subjects
ULTRASONIC wave attenuation; PHONON spectra; THERMOELASTICITY; BARIUM; CHALCOGENIDES; RADIO wave propagation
- Publication
Acoustical Physics, 2009, Vol 55, Issue 2, p186
- ISSN
1063-7710
- Publication type
Article
- DOI
10.1134/S1063771009020067