Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-10-25
Physics
Condensed Matter
Disordered Systems and Neural Networks
accepted in Physical Review B
Scientific paper
10.1103/PhysRevB.74.224202
Comparison of the internal friction at hypersonic frequencies between a few K and the glass transition temperature Tg for various glasses brings out general features. At low temperature, internal friction is only weakly dependent on the material. At high temperature but still below Tg the internal friction for strong glasses shows a T-independent plateau in a very wide domain of temperature; in contrast, for fragile glass, a nearly linear variation of internal friction with T is observed. Anharmonicity appears dominant over thermally activated relaxational processes at high temperature.
Levelut Claire
Pelous Jacques
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