Fragile-strong transitions and polyamorphism in glass former fluids

Details Fragile-strong transitions and polyamorphism in glass former fluids Fragile-strong transitions and polyamorphism in glass former fluids

2000-08-15

arxiv.org/abs/cond-mat/0008218v1

Mol. Phys. 99, 753 (2001)

Physics

Condensed Matter

5 pages, 6 figures

Scientific paper

10.1080/00268970010030031

A simple model of a glass former fluid, consisting of a bidisperse mixture of penetrable spheres is studied. The model shows a transition from fragile to strong behavior as 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 behavior), and individual particle motion (which gives rise to the strong behavior at low temperature). We also observe a maximum of diffusivity as a function of pressure that can be interpreted within the same framework. The connection between this behavior and polyamorphism is addressed.

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