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Thermophysical properties of a Si50Ge50 melt measured on board the International Space Station

Luo, Yuansu and Damaschke, Bernd and Lohöfer, Georg and Samwer, Konrad (2020) Thermophysical properties of a Si50Ge50 melt measured on board the International Space Station. npj Microgravity, 6, p. 10. Nature Publishing Group. doi: 10.1038/s41526-020-0100-5. ISSN 2373-8065.

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Abstract

Thermophysical properties of highly doped Si50Ge50 melt were measured contactlessly in the electromagnetic levitation facility ISSEML on board the International Space Station. The sample could be melted, overheated by about 375 K, and cooled down in 350 mbar Argon atmosphere. A large undercooling of about 240 K was observed and a quasi-homogeneous nucleation on the droplet surface occurred. During the cooling phase, high-resolution videos were taken from the side and the top. The density and thermal expansion were evaluated with digital image processing; the viscosity and the surface tension were measured by means of the oscillating drop technique. Inductive measurements of the electrical resistivity were conducted by a dedicated electronics. All data were taken as a function of temperature T from the overheated melt down to the undercooled range. We found a nonlinear thermal expansion, suggesting a many body effect in the liquid beyond the regular pair interaction, an enhanced damping of surface oscillations likely related to an internal turbulent flow, and an increment of the electrical resistivity with decreased T in the undercooled range regarding a demixing of the components.

Item URL in elib:https://elib.dlr.de/134812/
Document Type:Article
Title:Thermophysical properties of a Si50Ge50 melt measured on board the International Space Station
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Luo, YuansuUniversität GöttingenUNSPECIFIED
Damaschke, BerndUniversität GöttingenUNSPECIFIED
Lohöfer, Georggeorg.lohoefer (at) dlr.deUNSPECIFIED
Samwer, KonradUniversität GöttingenUNSPECIFIED
Date:2020
Journal or Publication Title:npj Microgravity
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:6
DOI :10.1038/s41526-020-0100-5
Page Range:p. 10
Publisher:Nature Publishing Group
ISSN:2373-8065
Status:Published
Keywords:density, surface tension, viscosity, electrical resistivity, Si50Ge50 melt, ISS
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
Deposited By: Lohöfer, Georg
Deposited On:11 May 2020 07:34
Last Modified:21 Oct 2021 16:38

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