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Fragile-strong transitions and polyamorphism in glass former fluids

E. A. Jagla
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Abstract

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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E. A. Jagla. 2000-08-15. Fragile-strong transitions and polyamorphism in glass former fluids. https://doi.org/10.1080/00268970010030031

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