Résumé
Phil. Mag. B, 79, 1981 (1999) We investigate the structure and dynamics of sodium disilicate by means of
molecular dynamics computer simulation. We show that the structure is described
by a partially destroyed tetrahedral SiO_4 network and a spherical super
structure formed by the silicon and sodium atoms. The static structure factor
of our simulation is in very good agreement with one from a neutron scattering
experiment. For 1008 particles we find strong finite size effects in the
dynamics which are due to the missing of modes contributing to the boson peak.