Thermal conductivity of Fe-Si alloys and thermal stratification in Earth's core
| dc.contributor.author | Zhang, Youjun | |
| dc.contributor.author | Luo, Kai | |
| dc.contributor.author | Hou, Mingqiang | |
| dc.contributor.author | Driscoll, Peter | |
| dc.contributor.author | Salke, Nilesh P. | |
| dc.contributor.author | Minár, Jan | |
| dc.contributor.author | Prakapenka, Vitali B. | |
| dc.contributor.author | Greenberg, Eran | |
| dc.contributor.author | Hemley, Russell J. | |
| dc.contributor.author | Cohen, R. E. | |
| dc.contributor.author | Lin, Jung-Fu | |
| dc.date.accessioned | 2022-02-28T11:00:28Z | |
| dc.date.available | 2022-02-28T11:00:28Z | |
| dc.date.issued | 2021 | |
| dc.description.abstract-translated | Light 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.format | 8 s. | cs |
| dc.format.mimetype | application/pdf | |
| dc.identifier.citation | ZHANG, 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: 0027-8424 | cs |
| dc.identifier.document-number | 748065500006 | |
| dc.identifier.doi | 10.1073/pnas.2119001119 | |
| dc.identifier.issn | 0027-8424 | |
| dc.identifier.obd | 43935071 | |
| dc.identifier.uri | 2-s2.0-85122700628 | |
| dc.identifier.uri | http://hdl.handle.net/11025/47054 | |
| dc.language.iso | en | en |
| dc.project.ID | EF15_003/0000358/Výpočetní a experimentální design pokročilých materiálů s novými funkcionalitami | cs |
| dc.publisher | National Academy of Sciences | en |
| dc.relation.ispartofseries | Proceedings Of The National Academy Of Sciences Of The United States Of America | en |
| dc.rights | © National Academy of Sciences | en |
| dc.rights.access | openAccess | en |
| dc.subject.translated | diamond anvil cell | en |
| dc.subject.translated | Earth’s core | en |
| dc.subject.translated | geodynamo | en |
| dc.subject.translated | light elements | en |
| dc.subject.translated | thermal conductivity | en |
| dc.title | Thermal conductivity of Fe-Si alloys and thermal stratification in Earth's core | en |
| dc.type | článek | cs |
| dc.type | article | en |
| dc.type.status | Peer-reviewed | en |
| dc.type.version | publishedVersion | en |