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Dynamic sound attenuation at hypersonic frequencies in silica glass

Claire Levelut·Rozenn Le Parc·Jacques Pelous
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Abstract

In order to clarify the origin of the dominant processes responsible for the acoustic attenuation of phonons, which is a much debatted topic, we present Bril louin scattering experiments in various silica glasses of different OH impurities content. A large temperature range, from 5 to 1500 K is investigated, up to the glass transition temperature. Comparison of the hypersonic wave attenuation in various samples allows to identify two different processes. The first one induce s a low temperature peak related to relaxational processes; it is strongly sensitive to the extrinsic defects. The second, dominant in the hig h temperature range, is weakly dependent on the impurities and can be ascribed to anharmonic interactions.

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Claire Levelut, Rozenn Le Parc, Jacques Pelous. 2006-01-05. Dynamic sound attenuation at hypersonic frequencies in silica glass. https://doi.org/10.1103/physrevb.73.052202

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