2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151665The transport properties of an ionic model for liquid silica 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. (submitted to "Molecular Simulation")5 pages, latex, 6 postscript figuresMaterials Sciencetext