Sound wave scattering in network glasses

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...

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Bibliographic Details
Published in:Physical review letters 2001-04, Vol.86 (17), p.3803-3806
Main Authors: Matic, A, Engberg, D, Masciovecchio, C, Börjesson, L
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.86.3803