A strong to fragile transition in a model of liquid silica

被引：46
|
作者：
Barrat, JL
Badro, J
Gillet, P
机构：
[1] Univ Lyon 1, Dept Phys Mat, CNRS, UMR 5586, F-69622 Villeurbanne, France
[2] Ecole Normale Super Lyon, Lab Sci Terre URA 726, F-69364 Lyon 07, France
[3] Ecole Normale Super Lyon, Inst Univ France, Lab Sci Terre URA 726, F-69364 Lyon 07, France
来源：
MOLECULAR SIMULATION | 1997年 / 20卷 / 1-2期
关键词：
liquid silica; strong to fragile transition;
D O I：
10.1080/08927029708024165
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：17 / 25
页数：9
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