Volume 47, Number 4, August II 1999
|Page(s)||468 - 473|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Anharmonicity and thermal transport in network glasses
Department of Applied Physics, Hokkaido University - Sapporo 060-8628, Japan
2 Department of Physics, University of California Riverside, California 92521-0101, USA
Accepted: 18 June 1999
The Nakayama model for network glasses classifies vibrational states into extended (ex), strongly localized (sl), and mesoscopically localized (ml), in increasing order of energy. Recently measured Raman spectra under hydrostatic pressure exhibit sl-mode anharmonicity at least twenty times that for the ex and ml modes. The ex modes can induce hopping of the sl modes, leading to a contribution to the thermal conductivity . This additional channel for heat conduction is consistent with measurements for a wide variety of glassy materials above the plateau temperature.
PACS: 63.20.Pw – Localized modes / 63.50.+x – Vibrational states in disordered systems / 66.70.+f – Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves
© EDP Sciences, 1999
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