On the wave vector dependence of the Boson peak in silicate glasses and crystals

Citation
Mj. Harris et al., On the wave vector dependence of the Boson peak in silicate glasses and crystals, PHYSICA B, 263, 1999, pp. 357-360
Citations number
6
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
09214526 → ACNP
Volume
263
Year of publication
1999
Pages
357 - 360
Database
ISI
SICI code
0921-4526(199903)263:<357:OTWVDO>2.0.ZU;2-6
Abstract
Recent work has demonstrated that a plausible explanation for the Boson pea k in silicate glasses is that it arises from transverse acoustic modes. We develop this argument further and put it on a firmer footing, by investigat ing the wave vector dependence of the Boson peak in inelastic neutron data. We make use of new results from an inelastic neutron scattering study of a crystalline polymorph of SiO2 (alpha-cristobalite). and of SiO2 glass and Li2Si2O5 glass. We find that the inelastic features in these three cases ma y be explained simply by arguments developed from phonon dispersion models of crystals. (C) 1999 Elsevier Science B.V. All rights reserved.