Glass Formation and Crystallization of a Simple Monatomic Liquid

Abstract

A simple monatomic system in two dimensions with a double-well interaction potential is investigated in a wide range of temperature by molecular dynamics simulation. The system is melted and equilibrated well above the melting temperature, and then it is quenched to a temperature 88% below the melting temperature Tm at several cooling rates to produce an amorphous state. Various thermodynamic quantities are measured as a function of temperature while the system is heated at a constant rate. The glass transiton is observed by a sudden increase of the energy and Tg is shown to be an increasing function of the cooling rate in the preparation process of the amorphous state. In a relatively-high temperature region, the system gradually transforms into crystals, and the time-temperature-transformation(TTT) curve shows a typical nose shape. It is found that the transformation time to a crystalline state is the shortest at a temperature 14~15% below the melting temperature Tm and that at sufficiently low temperatures the transformation time is much longer than the available CPU time. This indicates that a long-lived glassy state is realized.

14pages, 16figures

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• Designed Interaction Potentials via Inverse Methods for Self-Assembly
• Self-assembly of the simple cubic lattice with an isotropic potential
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Cited by in corpus (4)

• Superfragile glassy dynamics of onecomponent system with isotropic potential: competition of diffusion and frustration
• Dynamics of particle flips in two-dimensional quasicrystals
• Asymmetric crystallization during cooling and heating in model glass-forming systems
• Anomalous behavior and structure of a liquid of particles interacting through the harmonic-repulsive pair potential near the crystallization transition