Anharmonic vs. relaxational sound damping in glasses: II. Vitreous silica

Details Anharmonic vs. relaxational sound damping in glasses: II. Vitreous silica Anharmonic vs. relaxational sound damping in glasses: II. Vitreous silica

2005-05-23

arxiv.org/abs/cond-mat/0505560v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

13 pages with 8 figures

Scientific paper

10.1103/PhysRevB.72.214205

The temperature dependence of the frequency dispersion in the sound velocity and damping of vitreous silica is reanalyzed. Thermally activated relaxation accounts for the sound attenuation observed above 10 K at sonic and ultrasonic frequencies. Its extrapolation to the hypersonic regime reveals that the anharmonic coupling to the thermal bath becomes important in Brillouin-scattering measurements. At 35 GHz and room temperature, the damping due to this anharmonicity is found to be nearly twice that produced by thermally activated relaxation. The analysis also reveals a sizeable velocity increase with temperature which is not related with sound dispersion. This suggests that silica experiences a gradual structural change that already starts well below room temperature.

Affiliated with

Also associated with

No associations

Rating

Anharmonic vs. relaxational sound damping in glasses: II. Vitreous silica 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 Anharmonic vs. relaxational sound damping in glasses: II. Vitreous silica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anharmonic vs. relaxational sound damping in glasses: II. Vitreous silica will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-559796