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 / G., Baldi; E., Fabiani; A., Fontana; V. M., Giordano; G., Monaco; Ruocco, Giancarlo; F., Sette. - In: PHILOSOPHICAL MAGAZINE. - ISSN 1478-6435. - 88:33-35(2008), pp. 3915-3923. (Intervento presentato al convegno 11th International Workshop on Complex Systems tenutosi a Andalo, ITALY nel MAR 17-20, 2008) [10.1080/14786430802438192].
Contribution of the terahertz vibrations to the high-temperature thermal conductivity of vitreous silica
RUOCCO, Giancarlo;
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
