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dc.contributor.authorZhang, Youjun
dc.contributor.authorLuo, Kai
dc.contributor.authorHou, Mingqiang
dc.contributor.authorDriscoll, Peter
dc.contributor.authorSalke, Nilesh P.
dc.contributor.authorMinár, Jan
dc.contributor.authorPrakapenka, Vitali B.
dc.contributor.authorGreenberg, Eran
dc.contributor.authorHemley, Russell J.
dc.contributor.authorCohen, R. E.
dc.contributor.authorLin, Jung-Fu
dc.date.accessioned2022-02-28T11:00:28Z-
dc.date.available2022-02-28T11:00:28Z-
dc.date.issued2021
dc.identifier.citationZHANG, Y. LUO, K. HOU, M. DRISCOLL, P. SALKE, NP. MINÁR, J. PRAKAPENKA, VB. GREENBERG, E. HEMLEY, RJ. COHEN, RE. LIN, J. Thermal conductivity of Fe-Si alloys and thermal stratification in Earth's core. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2021, roč. 119, č. 1, s. nestránkováno. ISSN: 0027-8424cs
dc.identifier.issn0027-8424
dc.identifier.uri2-s2.0-85122700628
dc.identifier.urihttp://hdl.handle.net/11025/47054
dc.format8 s.cs
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherNational Academy of Sciencesen
dc.relation.ispartofseriesProceedings Of The National Academy Of Sciences Of The United States Of Americaen
dc.rights© National Academy of Sciencesen
dc.titleThermal conductivity of Fe-Si alloys and thermal stratification in Earth's coreen
dc.typečlánekcs
dc.typearticleen
dc.rights.accessopenAccessen
dc.type.versionpublishedVersionen
dc.description.abstract-translatedLight elements in Earth’s core play a key role in driving convection and influencing geodynamics, both of which are crucial to the geodynamo. However, the thermal transport properties of iron alloys at high-pressure and -temperature conditions remain uncertain. Here we investigate the transport properties of solid hexagonal close-packed and liquid Fe-Si alloys with 4.3 and 9.0 wt % Si at high pressure and temperature using laser-heated diamond anvil cell experiments and first-principles molecular dynamics and dynamical mean field theory calculations. In contrast to the case of Fe, Si impurity scattering gradually dominates the total scattering in Fe-Si alloys with increasing Si concentration, leading to temperature independence of the resistivity and less electron–electron contribution to the conductivity in Fe-9Si. Our results show a thermal conductivity of ∼100 to 110 Wm21K21 for liquid Fe-9Si near the topmost outer core. If Earth’s core consists of a large amount of silicon (e.g., > 4.3 wt %) with such a high thermal conductivity, a subadiabatic heat flow across the core–mantle boundary is likely, leaving a 400- to 500-km-deep thermally stratified layer below the core–mantle boundary, and challenges proposed thermal convection in Fe-Si liquid outer core. © 2022 National Academy of Sciences. All rights reserved.en
dc.subject.translateddiamond anvil cellen
dc.subject.translatedEarth’s coreen
dc.subject.translatedgeodynamoen
dc.subject.translatedlight elementsen
dc.subject.translatedthermal conductivityen
dc.identifier.doi10.1073/pnas.2119001119
dc.type.statusPeer-revieweden
dc.identifier.document-number748065500006
dc.identifier.obd43935071
dc.project.IDEF15_003/0000358/Výpočetní a experimentální design pokročilých materiálů s novými funkcionalitamics
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