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

 dc.contributor.author Luo, Yuansu dc.contributor.author Damaschke, Bernd dc.contributor.author Lohöfer, Georg dc.contributor.author Samwer, Konrad dc.date.accessioned 2020-05-29T13:17:00Z dc.date.available 2020-05-29T13:17:00Z dc.date.issued 2020 de dc.identifier.uri http://resolver.sub.uni-goettingen.de/purl?gs-1/17358 dc.description.abstract Thermophysical 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 de 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. dc.description.sponsorship Open-Access-Publikationsfonds 2020 dc.language.iso eng de dc.rights openAccess dc.rights Namensnennung 4.0 International * dc.rights.uri http://creativecommons.org/licenses/by/4.0/ * dc.subject Materials science; Structure of solids and liquids de dc.subject.ddc 530 dc.title Thermophysical properties of a Si$_{50}$Ge$_{50}$ melt measured on board the International Space Station de dc.type journalArticle de dc.identifier.doi 10.1038/s41526-020-0100-5 dc.type.version publishedVersion de dc.relation.eISSN 2373-8065 dc.bibliographicCitation.volume 6 de dc.bibliographicCitation.issue 1 de dc.bibliographicCitation.firstPage 1 de dc.bibliographicCitation.lastPage 9 de dc.type.subtype journalArticle dc.bibliographicCitation.articlenumber 10 de dc.description.status peerReviewed de dc.bibliographicCitation.journal npj Microgravity de
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