A strong to fragile transition in a model of liquid silica

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 an 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.


Published in:
Molecular Simulation, 20, 17-25
Presented at:
Meeting on Computer Simulation of Glasses and Related Materials, PARIS, FRANCE, Jul 10, 1996
Year:
1997
Keywords:
Laboratories:




 Record created 2011-09-29, last modified 2018-03-17


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