A combined inelastic X-ray and neutron scattering experiment is performed on the prototypical glass vitreous silica. The complementarity of the two techniques is exploited to determine the dynamic structure factor in a wide range of energies and wavevectors. The vibrational-mode spectral density is then used to compute the high-temperature thermal conductivity. The acoustic-like modes persisting at THz frequencies are shown to represent a relevant heat conduction channel, although they cannot account for the entire thermal conductivity.

Contribution of the terahertz vibrations to the high temperature thermal conductivity of vitreous silica

Baldi, Giacomo;Fontana, Aldo;Monaco, Giulio;
2008

Abstract

A combined inelastic X-ray and neutron scattering experiment is performed on the prototypical glass vitreous silica. The complementarity of the two techniques is exploited to determine the dynamic structure factor in a wide range of energies and wavevectors. The vibrational-mode spectral density is then used to compute the high-temperature thermal conductivity. The acoustic-like modes persisting at THz frequencies are shown to represent a relevant heat conduction channel, although they cannot account for the entire thermal conductivity.
33-35
Baldi, Giacomo; Fabiani, E.; Fontana, Aldo; Giordano, V. M.; Monaco, Giulio; Ruocco, G.; Sette, F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/80364
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