Diffusion in confinement as a microscopic relaxation mechanism in glass-forming liquids

被引：22

作者：

Mamontov, Eugene ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Chem & Engn Mat Div, Neutron Sci Directorate, Oak Ridge, TN 37831 USA

来源：

CHEMICAL PHYSICS LETTERS | 2012年 / 530卷

关键词：

NEUTRON SPIN-ECHO; MOLECULAR-DYNAMICS; IONIC LIQUID; AMORPHOUS SELENIUM; METALLIC LIQUID; PARTICLE MOTION; SCATTERING; GLYCEROL; HETEROGENEITY; CROSSOVER;

D O I：

10.1016/j.cplett.2012.01.073

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：

Using quasielastic neutron scattering, we compare dynamics in single-element liquids, glass-forming selenium and non glass-forming gallium. There is a single jump-diffusion process in gallium, whereas in selenium there is also a faster, spatially localized process. The fast and slow processes describe beta- and alpha-relaxation, respectively. We then analyze an archetypical glass-former, glycerol, to show that the two-component fit, with beta- and alpha-relaxations explicitly separated, yields the correct value for the translational diffusion coefficient and provides information on the spatial localization of the beta-relaxation that is not experimentally accessible otherwise. (C) 2012 Elsevier B. V. All rights reserved.

引用

页码：55 / 60

页数：6

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