2000/08/15 by E. A. Jagla · 2 citations
Engineering · Materials Science · Physics and Astronomy · #Material Dynamics and Properties #Phase Equilibria and Thermodynamics #Theoretical and Computational Physics #cond-mat
paper · pdf · doi:10.1080/00268970010030031
published as Mol. Phys. 99, 753 (2001) · 5 pages, 6 figures
arxiv created 2000/08/15 · openalex publication_date 2001/05/10 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
A simple model of a glass forming fluid, consisting of a bidisperse mixture of penetrable spheres, is studied numerically by Monte Carlo simulation. The model shows a transition from fragile to strong behaviour as the temperature is reduced. This transition is driven by the competition between the two mechanisms that contribute to diffusivity in the model: collective rearrangement of particles (responsible for the fragile behaviour), and individual particle motion (which gives rise to the strong behaviour at low temperatures). Also observed is a maximum of diffusivity as a function of pressure that can be interpreted within the same framework. The connection between this behaviour and polyamorphism is addressed.