Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2005-02-08
J. Chem. Phys. 128, 244507 (2008)
Physics
Condensed Matter
Disordered Systems and Neural Networks
13 pages, 13 figures, 39 references
Scientific paper
10.1063/1.2937731
The incoherent approximation for the determination of the vibrational density of states of glasses from inelastic neutron or x-ray scattering data is extended to treat the coherent scattering. The method is applied to new room temperature measurements of vitreous silica and germania on the thermal time-of-flight spectrometer IN4 at the High Flux Reactor in Grenoble. The inelastic dynamic structure factor at the boson peak turns out to be reasonably well described in terms of a mixture of rotation and translation of practically undistorted SiO4 or GeO4 tetrahedra. The translational component exceeds the expectation of the Debye model by a factor of two. A possible relation of this excess to the phonon shift and broadening observed in x-ray Brillouin scattering experiments is discussed.
Buchenau U.
Fabiani E.
Fontana Adriano
No associations
LandOfFree
Neutron scattering study of the vibrations in vitreous silica and germania does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Neutron scattering study of the vibrations in vitreous silica and germania, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutron scattering study of the vibrations in vitreous silica and germania will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-28017