Intermediate-range structure and low-energy dynamics of densified SiO2 glass

The structure and dynamics of densified SiO2 glasses have been studied by neutron scattering and Raman scattering as a function of the density. The detailed evolution of the intermediate-range structure, which appears as a change in the first and second diffraction peaks, were clearly observed and we found that a structural change has a linear proportionality to the density. The low-energy dynamics, the Boson peak, have also a strong correlation with the change of the intermediate-range structure. In this paper we discuss this correlation from the point of view that the six-fold ring structure has a key role. (C) 1998 Published by Elsevier Science B.V. All rights reserved.