title: Acoustic properties of a porous glass (vycor) at hypersonic frequencies.
abstract: Brillouin scattering experiments have been performed from 5 to 1600 K in vycor, a porous silica glass. The acoustic velocity and attenuation at hypersonic frequencies are compared to those of bulk silica and others porous silica samples. The experimental evidence for the influence of porosity on the scattering by acoustic waves is compared to calculations. The correlation between internal friction and thermal conductivity at low temperature is discussed.
authors.affiliation: Laboratoire des Colloïdes, Verres et Nanomatériaux, CNRS/UMR5587, Université Montpellier II, cc 69, 34095 Montpellier cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Levelut
authors.forename: J
authors.initials: J
authors.lastname: Pelous