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Self-diffusion and microscopic dynamics in a gold-silicon liquid investigated with quasielastic neutron scattering

Evenson, Z and Yang, F and Simeoni, G and Meyer, A (2016) Self-diffusion and microscopic dynamics in a gold-silicon liquid investigated with quasielastic neutron scattering. Applied Physics Letters, 108 (12). American Institute of Physics (AIP). ISSN 0003-6951

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Abstract

We use incoherent quasielastic neutron scattering to study the atomic dynamics of gold in a eutectic Au81Si19 melt. Despite the glass-forming nature of this system, the gold self-diffusivity displays an Arrhenius behavior with a low activation energy characteristic of simple liquids. At high temperatures, long-range transport of gold atoms is well described by hydrodynamic theory with a simple exponential decay of the self-correlation function. On cooling towards the melting temperature, structural relaxation crosses over to a highly stretched exponential behavior. This suggests the onset of a heterogeneous dynamics, even in the equilibrium melt, and is indicative of a very fragile liquid

Item URL in elib:https://elib.dlr.de/109864/
Document Type:Article
Title:Self-diffusion and microscopic dynamics in a gold-silicon liquid investigated with quasielastic neutron scattering
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Evenson, ZUNSPECIFIEDUNSPECIFIED
Yang, Finstitut für materialphysik im weltraum, deutsches zentrum für luft- und raumfahrt (dlr), 51170 köln, germanyUNSPECIFIED
Simeoni, GUNSPECIFIEDUNSPECIFIED
Meyer, Ainstitut für materialphysik im weltraum, deutsches zentrum für luft- und raumfahrt (dlr), 51170 köln, germanyUNSPECIFIED
Date:March 2016
Journal or Publication Title:Applied Physics Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:108
Publisher:American Institute of Physics (AIP)
ISSN:0003-6951
Status:Published
Keywords:Dynamics, Gold Atoms, hydrodynamic theory
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialdesign und neue Materialien
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prochnow, Kim
Deposited On:03 Jan 2017 08:55
Last Modified:05 Sep 2019 13:59

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