title: Sound wave scattering in network glasses.
abstract: The acoustic branch of two network glasses, (Li2O)xB2O3 ( x = 0.25 and 0.5), is followed over a large momentum transfer range 1-12 nm(-1), using inelastic x-ray scattering. We observe the transition from propagating modes to a region of strong scattering as the Ioffe-Regel limit is reached. A region of Rayleigh scattering of the acoustic modes precedes the strong scattering regime at larger Q, causing a rapid decrease of the mean-free path of the modes.
authors.affiliation: Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden. matic@fy.chalmers.se
authors.forename: A
authors.initials: A
authors.lastname: Matic
authors.forename: D
authors.initials: D
authors.lastname: Engberg
authors.forename: C
authors.initials: C
authors.lastname: Masciovecchio
authors.forename: L
authors.initials: L
authors.lastname: Börjesson