Contribution of the terahertz vibrations to the high temperature thermal conductivity of vitreous silica
Résumé
A combined inelastic X-rays 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 wave-vectors. The vibrational modes 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.
Origine : Fichiers produits par l'(les) auteur(s)
Loading...