Supercooled Lennard-Jones liquids and glasses:: a kinetic Monte Carlo approach

被引:13
作者
Hernández-Rojas, J
Wales, DJ
机构
[1] Univ Cambridge, Chem Labs, Cambridge CB2 1EW, England
[2] Univ La Laguna, Dept Fis Fundamental 2, Tenerife 38205, Spain
关键词
D O I
10.1016/j.jnoncrysol.2004.01.012
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A kinetic Monte Carlo (KMC) method is used to study the structural properties and dynamics of a supercooled binary Lennard-Jones liquid around the glass transition temperature. This technique permits us to explore the potential energy surface without suffering an exponential slowing down at low temperature. We find a transition temperature that separates two distinct regimes around the dynamical transition temperature of mode-coupling theory. Below this temperature the number of different local minima visited by the system for the same number of KMC steps decreases by more than an order of magnitude. The mean number of atoms involved in each jump between local minima and the average distance they move also decreases significantly, and new features appear in the partial structure factor. At higher temperature the probability distribution for the magnitude of the atomic displacement per KMC step exhibits an exponential decay, which is only weakly temperature dependent. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:218 / 222
页数:5
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