Abstract
Diffusion and structure in liquid silica under pressure have been investigated by amolecular dynamics model of 999 atoms with the inter-atomic potentials of van Beest,Kramer and van Santen. The simulation reveals that silica liquid is composed of the speciesSiO4,SiO5 and SiO6 with a fraction dependent on pressure. The density as well as volume of voids can be expressedas a linear function of the fraction of those species. Low-density liquid is mainly constructed ofSiO4 and has a large number of O- and Si-voids and a large void tube. This tube contains mostO-voids and is spread over the whole system. The anomalous diffusion behavior is observedand discussed.
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