A Strong to Fragile Transition in a Model of Liquid Silica |
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| Authors: | Jean-Louis Barrat James Badro Philippe Gillet |
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| Affiliation: | 1. Département de Physique des Matériaux (UMR CNRS 5586) , Université Claude Bernard , 43 bd. du 11 novembre 1918, F-69622, Villeurbanne Cedex, France;2. Laboratoire de Sciences de la Terre (URA 726) , Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, F-69364, Lyon Cedex 07, France;3. Laboratoire de Sciences de la Terre (URA 726) , Institut Universitaire de France , Ecole Normale Supérieure de Lyon, 46 Allée d'Italie F-69364, Lyon Cedex 07, France |
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| Abstract: | Abstract The transport properties of an ionic model for liquid silica [1] at high temperatures and pressure are investigated using molecular dynamics simulations. With increasing pressure, a clear change from “strong” to “fragile” behaviour (according to Angell's classification of glass-forming liquids) is observed, albeit only on the small viscosity range that can be explored in MD simulations. This change is related to structural changes, from an almost perfect four-fold coordination to an imperfect five or six-fold coordination. |
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| Keywords: | Liquid silica strong to fragile transition |
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