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Comparison of the internal friction at hypersonic frequencies between a few Kand the glass transition temperature Tg for various glasses brings out generalfeatures. At low temperature, internal friction is only weakly dependent on thematerial. At high temperature but still below Tg the internal friction forstrong glasses shows a T-independent plateau in a very wide domain oftemperature; in contrast, for fragile glass, a nearly linear variation ofinternal friction with T is observed. Anharmonicity appears dominant overthermally activated relaxational processes at high temperature.Comment: accepted in Physical Review

physical review. b, condensed matter and materials physics

Universal behavior of internal friction in glasses below<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>g</mml:mi></mml:msub></mml:math>: Anharmonicity versus relaxation

Universal behavior of internal friction in glasses belowTg: Anharmonicity versus relaxation