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Thermophysical properties of a Si$_{50}$Ge$_{50}$ melt measured on board the International Space Station

dc.contributor.authorLuo, Yuansu
dc.contributor.authorDamaschke, Bernd
dc.contributor.authorLohöfer, Georg
dc.contributor.authorSamwer, Konrad
dc.date.accessioned2020-05-29T13:17:00Z
dc.date.available2020-05-29T13:17:00Z
dc.date.issued2020de
dc.identifier.urihttp://resolver.sub.uni-goettingen.de/purl?gs-1/17358
dc.description.abstractThermophysical properties of highly doped Si$_{50}$Ge$_{50}$ 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.de
dc.description.sponsorshipOpen-Access-Publikationsfonds 2020
dc.language.isoengde
dc.rightsopenAccess
dc.rightsNamensnennung 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectMaterials science; Structure of solids and liquidsde
dc.subject.ddc530
dc.titleThermophysical properties of a Si$_{50}$Ge$_{50}$ melt measured on board the International Space Stationde
dc.typejournalArticlede
dc.identifier.doi10.1038/s41526-020-0100-5
dc.type.versionpublishedVersionde
dc.relation.eISSN2373-8065
dc.bibliographicCitation.volume6de
dc.bibliographicCitation.issue1de
dc.bibliographicCitation.firstPage1de
dc.bibliographicCitation.lastPage9de
dc.type.subtypejournalArticle
dc.bibliographicCitation.articlenumber10de
dc.description.statuspeerReviewedde
dc.bibliographicCitation.journalnpj Microgravityde


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