Molecular dynamics study of the longitudinal modes in disparate-mass binary liquid mixtures -: art. no. 021202

被引：7

作者：

Anento, N ^{[1
]}

Padró, JA ^{[1
]}

机构：

[1] Univ Barcelona, Dept Fis Fonamental, E-08028 Barcelona, Spain

来源：

PHYSICAL REVIEW E | 2001年 / 64卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.64.021202

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

A series of molecular dynamics simulations of simple liquid binary mixtures of soft spheres with disparate-mass particles were carried out to investigate the origin of the marked differences between the dynamic structure factors of some liquid binary mixtures such as the Li0.7Mg0.3 and Li0.8Pb0.2 alloys. It is shown that the facility for observing peaks associated with fast-propagating modes in the partial Li-Li dynamic structure factor of Li0.8Pb0.2 should be mainly attributed to the structure of this alloy, which is characterized by an incipient ABAB ordering as found in molten salts. The longitudinal dispersion relations at intermediate wave vectors obtained from the longitudinal current spectra are very similar for the two alloys and reflect the existence of both fast-and slow-propagating modes of kinetic character associated with light and heavy particles, respectively. The influence of the hardness of the repulsive potential cores as well as the composition of the mixture on the longitudinal collective modes is also discussed.

引用

页码：10 / 212021

页数：10

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