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Viscous flow and self-diffusion in densely and loosely packed metallic melts

Nell, Sarah and Yang, Fan and Evenson, Zachary and Meyer, A (2021) Viscous flow and self-diffusion in densely and loosely packed metallic melts. Physical Review B - Condensed Matter and Materials Physics, 103 (6), 064206. American Physical Society. doi: 10.1103/PhysRevB.103.064206. ISSN 1098-0121.

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Official URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.064206


The Ni self-diffusion, density, and viscosity of the densely packed liquid Ni66.7B33.3 and the more loosely packed liquid Ge66.7Ni33.3 were measured with high accuracy using different experimental methods. The viscosity η was obtained using the oscillating-drop method combined with electrostatic levitation and the oscillating-cup technique in a rheometer. The Ni self-diffusion coefficient DNi was obtained from quasielastic neutron scattering experiments. For Ni66.7B33.3, it was found that the activation energies for self-diffusion and viscous flow, ED and Eη, respectively, are almost equal. Hence, the product of the viscosity η and self-diffusion coefficient D is fairly constant over the entire temperature range measured, spanning almost 800 K. In contrast, for Ge66.7Ni33.3, Dη increases with increasing temperature, indicating that the dynamics in liquid Ge66.7Ni33.3 shows better agreement with an activated process. This temperature dependence is in line with the Stokes-Einstein relation.

Item URL in elib:https://elib.dlr.de/144397/
Document Type:Article
Title:Viscous flow and self-diffusion in densely and loosely packed metallic melts
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Meyer, AInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, GermanyUNSPECIFIEDUNSPECIFIED
Date:18 February 2021
Journal or Publication Title:Physical Review B - Condensed Matter and Materials Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:064206
Publisher:American Physical Society
Keywords:Self-diffusion, Liquid metals, Viscosity, Quasielastic neutron scattering
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 - Research under Space Conditions
DLR - Research theme (Project):R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Yang, Fan
Deposited On:11 Oct 2021 08:53
Last Modified:19 Nov 2021 20:26

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