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.
Funding text :
C.Y. acknowledges IDS FunMat for the financial support
for his Ph.D. project (Project 2013-05-EM). C.Y. and J.Y.R.
gratefully acknowledge the computational resources provided
by the Consortium des Équipements de Calcul Intensif
(CÉCI), funded by the Fonds de la Recherche Scientifique de
Belgique (F.R.S.-FNRS) under Grant No. 2.5020.11 and the
Tier-1 supercomputer of the Fédération Wallonie-Bruxelles,
infrastructure funded by the Walloon Region under Grant
Agreement No. 1117545.
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