Numéro
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
Page(s) C5-553 - C5-556
DOI https://doi.org/10.1051/jphyscol:1981584
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. Colloques 42 (1981) C5-553-C5-556

DOI: 10.1051/jphyscol:1981584

FREQUENCY DEPENDENCE OF SOUND ABSORPTION OF VITREOUS SILICA BETWEEN 10 MHz AND 35 GHz

R. Vacher1, J. Pelous1, F. Plicque2 et A. Zarembowitch2

1  Laboratoire de Spectrométrie Rayleigh Brillouin (ERA 460), Université des Sciences et Techniques du Languedoc, Place E. Bataillon, 34060 Montpellier Cedex, France
2  Département de Recherches Physiques (LA 71), Université Pierre et Marie Curie 75230 Paris Cedex 05, France


Abstract
We present new measurements of the attenuation of ultranonic and hypersonic waves for temperatures ranging from 10 to 300 K in silica glass. The results show that the relaxation process which is predominant for the absorption of ultrasonic waves is not sufficient for describing hypersonic attenuation. Anharmonic three-phonon interactions are proposed to explain the excess damping, and are seen to be in qualitative agreement with the observed temperature dependence above 300 K.