Phys. Rev. B 72, 214204 (2005) [9 pages]Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silicaReceived 20 May 2005; revised 16 September 2005; published 9 December 2005 This series discusses the origin of sound damping and dispersion in glasses. In particular, we address the relative importance of anharmonicity versus thermally activated relaxation. In this first article, Brillouin-scattering measurements of permanently densified silica glass are presented. It is found that in this case the results are compatible with a model in which damping and dispersion are only produced by the anharmonic coupling of the sound waves with thermally excited modes. The thermal relaxation time and the unrelaxed velocity are estimated. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.214204
DOI:
10.1103/PhysRevB.72.214204
PACS:
78.40.Pg, 63.50.+x, 78.35.+c
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