Article (Scientific journals)
Anomalous diffusion and non-monotonic relaxation processes in Ge-Se liquids
Yildirim, Can; Raty, Jean-Yves; Micoulaut, Matthieu
2016In Journal of Chemical Physics, 144
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Keywords :
Ge-Se liquids; dynamics; glass transition
Abstract :
[en] We investigate the dynamical properties of liquid GexSe100−x as a function of Ge content by first-principles molecular dynamic simulations for a certain number of temperatures in the liquid state. The focus is set on ten compositions (where x ≤ 33%) encompassing the reported flexible to rigid and rigid to stressed-rigid transitions. We examine diffusion coefficients, diffusion activation energies, glassy relaxation behavior, and viscosity of these liquids from Van Hove correlation and intermediate scattering functions. At fixed temperature, all properties/functions exhibit an anomalous behavior with Ge content in the region 18%-22%, and provide a direct and quantitative link to the network rigidity.
Disciplines :
Physics
Author, co-author :
Yildirim, Can ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Raty, Jean-Yves  ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Micoulaut, Matthieu
Language :
English
Title :
Anomalous diffusion and non-monotonic relaxation processes in Ge-Se liquids
Alternative titles :
[en] Anomalous diffusion and non-monotonic relaxation processes in Ge-Se liquids
Publication date :
13 June 2016
Journal title :
Journal of Chemical Physics
ISSN :
0021-9606
eISSN :
1089-7690
Publisher :
American Institute of Physics, United States - New York
Volume :
144
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
Tier-1 supercomputer
CÉCI : Consortium des Équipements de Calcul Intensif
Funders :
Fonds de la Recherche Scientifique de Belgique (F.R.S.-FNRS) under Grant No. 2.5020.
IDS FunMat Erasmus Mundus
CÉCI - Consortium des Équipements de Calcul Intensif [BE]
Tier-1
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since 27 September 2016

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