Abstract
The high-pressure dynamics of a computer-modelled silica melt is studied in the frameworkof the mode-coupling theory of the glass transition using static structure input frommolecular dynamics computer simulation. The theory reproduces the experimentally knownviscosity minimum (diffusivity maximum) as a function of density or pressure and explainsit in terms of a corresponding minimum in its critical temperature. This minimum arisesfrom a gradual change in the equilibrium static structure which shifts from beingdominated by tetrahedral ordering to showing the cageing known from high-densityliquids. The theory is in qualitative agreement with computer simulation results.
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