Molecular Dynamics Computer Simulation of the Dynamics of Supercooled Silica

Abstract

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.

5 pages, Latex, 6 postscript figures

References in corpus (3)

• Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture I: The van Hove Correlation Function
• Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture II: Intermediate Scattering Function and Dynamic Susceptibility
• Some Finite Size Effects in Simulations of Glass Dynamics

Cited by in corpus (15)

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• Structure and Dynamics of amorphous Silica Surfaces
• The relaxation dynamics of a viscous silica melt: II The intermediate scattering functions
• Frequency dependent specific heat of viscous silica
• Cooperative motions in a finite size model of liquid silica: an anomalous behavior
• The glass transition in a model silica glass: evolution of the local structure
• Motility-induced buckling and glassy dynamics regulate three-dimensional transitions of bacterial monolayers
• Elastic constant dishomogeneity and $Q^2$ dependence of the broadening of the dynamical structure factor in disordered systems
• The liquid-glass transition of silica
• Dynamical properties of densely packed confined hard-sphere fluids
• Excess Vibrational Density of States and the Brittle to Ductile Transition in Crystalline and Amorphous Solids
• Scaling equations for mode-coupling theories with multiple decay channels
• Non Gaussian information of heterogeneity in Soft Matter
• How can computer simulations contribute to the understanding of the dynamics of glasses and glass melts?