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The measurement of self-diffusion coefficients in liquid metals with quasielastic neutron scattering

Meyer, Andreas (2015) The measurement of self-diffusion coefficients in liquid metals with quasielastic neutron scattering. European Physical Journal E (83), 01002. Springer. DOI: 10.1051/epjoncf/20158301002 ISSN 1292-8941

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Official URL: http://dx.doi.org/10.1051/epjconf/20158301002

Abstract

Quasielastic incoherent neutron scattering (QENS) has proven to be a versatile tool to study self diffusion of atoms in liquid metals. Here it is shown, that coherent contributions to the signal in the small q limit appear as a flat and energy independent constant to the QENS signal in single-component liquid metals even for systems with a samll incoherent scattering cross section, like aluminium. Container-less processing via electromagnetic or electrostatic levitation devices, espacially designed for QENS, enables the in-situ measurement on liquid metallic droplets of sizes between 5 mm to 10 mm in diameter. This gives access of several hundred Kelvin below the respective melting point. Compared to experiments using a thin-walled crucible giving self-diffusion coefficient. QENS results of liquid germanium and germanium isotope mixtures, titanium, nickel, copper and aluminium are receiwed. The self-diffusion coefficeints of these systems are best described by an Arrhenius-type temperature dependence around their respecitve melting points.

Item URL in elib:https://elib.dlr.de/95514/
Document Type:Article
Title:The measurement of self-diffusion coefficients in liquid metals with quasielastic neutron scattering
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Meyer, AndreasInstitut für Materialphysik im WeltraumUNSPECIFIED
Date:February 2015
Journal or Publication Title:European Physical Journal E
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1051/epjoncf/20158301002
Page Range:01002
Editors:
EditorsEmail
UNSPECIFIEDEDP Sciences
Publisher:Springer
Series Name:EPJ Web of Conferences
ISSN:1292-8941
Status:Published
Keywords:Self-diffusion
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 Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Leitungsbereich MP
Deposited By: Prochnow, Kim
Deposited On:05 Mar 2015 09:35
Last Modified:06 Sep 2019 15:21

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