J. Phys. IV France
Volume 02, Numéro C2, Octobre 1992
European Workshop on Glasses and Gels
Page(s) C2-279 - C2-283
Publié en ligne 30 juillet 2010
European Workshop on Glasses and Gels

J. Phys. IV France 02 (1992) C2-279-C2-283

DOI: 10.1051/jp4:1992232

The origin of the anomalous low-frequency vibrational behaviour of amorphous solids


Laboratoire de Science des Matériaux Vitreux, Université de Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex, France

The anomalous vibrational behaviour exhibited by non-crystalline materials - a peak in the vibrational density of states, and in the Raman spectrum (the boson peak) at low frequencies, and a peak in the heat capacity and a plateau in the thermal conductivity at low temperatures - is ascribed ta phonon localization associated with the strong scattering of phonons by density-fluctuation domains in the structure. Within such domains, short-range and medium-range arder is maintained, and outside them the material is structurally homogeneous and isotropie. This model can also explain the correlation between the boson-peak frequency and the position of the first sharp diffraction peak in the structure factor observed in a number of inorganie and polymerie amorphous solids.

© EDP Sciences 1992