Molecular Dynamics Computer Simulation of the Dynamics of Supercooled Silica

Details Molecular Dynamics Computer Simulation of the Dynamics of Supercooled Silica Molecular Dynamics Computer Simulation of the Dynamics of Supercooled Silica

1997-03-27

arxiv.org/abs/cond-mat/9703237v1

Phil. Mag. B 77, 297 (1998)

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, Latex, 6 postscript figures

Scientific paper

We present the results of a large scale computer simulation of supercooled silica. We find that at high temperatures the diffusion constants show a non-Arrhenius temperature dependence whereas at low temperature this dependence is also compatible with an Arrhenius law. We demonstrate that at low temperatures the intermediate scattering function shows a two-step relaxation behavior and that it obeys the time temperature superposition principle. We also discuss the wave-vector dependence of the nonergodicity parameter and the time and temperature dependence of the non-Gaussian parameter.

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