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Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus

Electrical resistivity measurements of Fe–10wt%Ni–10wt%Si have been performed in a multi-anvil press from 3 to 20 GPa up to 2200 K. The temperature and pressure dependences of electrical resistivity are analyzed in term of changes in the electron mean free path. Similarities in the thermal propertie...

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Autores principales: Berrada, Meryem, Secco, Richard A., Yong, Wenjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9200758/
https://www.ncbi.nlm.nih.gov/pubmed/35705611
http://dx.doi.org/10.1038/s41598-022-14130-z
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author Berrada, Meryem
Secco, Richard A.
Yong, Wenjun
author_facet Berrada, Meryem
Secco, Richard A.
Yong, Wenjun
author_sort Berrada, Meryem
collection PubMed
description Electrical resistivity measurements of Fe–10wt%Ni–10wt%Si have been performed in a multi-anvil press from 3 to 20 GPa up to 2200 K. The temperature and pressure dependences of electrical resistivity are analyzed in term of changes in the electron mean free path. Similarities in the thermal properties of Fe–Si and Fe–Ni–Si alloys suggest the effect of Ni is negligible. Electrical resistivity is used to calculate thermal conductivity via the Wiedemann–Franz law, which is then used to estimate the adiabatic heat flow. The adiabatic heat flow at the top of Earth’s core is estimated to be 14 TW from the pressure and temperature dependences of thermal conductivity in the liquid state from this study, suggesting thermal convection may still be an active source to power the dynamo depending on the estimated value taken for the heat flow through the core mantle boundary. The calculated adiabatic heat flux density of 22.7–32.1 mW/m(2) at the top of Mercury’s core suggests a chemically driven magnetic field from 0.02 to 0.21 Gyr after formation. A thermal conductivity of 140–148 Wm(−1) K(−1) is estimated at the center of a Fe–10wt%Ni–10wt%Si Venusian core, suggesting the presence of a solid inner core and an outer core that is at least partially liquid.
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spelling pubmed-92007582022-06-17 Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus Berrada, Meryem Secco, Richard A. Yong, Wenjun Sci Rep Article Electrical resistivity measurements of Fe–10wt%Ni–10wt%Si have been performed in a multi-anvil press from 3 to 20 GPa up to 2200 K. The temperature and pressure dependences of electrical resistivity are analyzed in term of changes in the electron mean free path. Similarities in the thermal properties of Fe–Si and Fe–Ni–Si alloys suggest the effect of Ni is negligible. Electrical resistivity is used to calculate thermal conductivity via the Wiedemann–Franz law, which is then used to estimate the adiabatic heat flow. The adiabatic heat flow at the top of Earth’s core is estimated to be 14 TW from the pressure and temperature dependences of thermal conductivity in the liquid state from this study, suggesting thermal convection may still be an active source to power the dynamo depending on the estimated value taken for the heat flow through the core mantle boundary. The calculated adiabatic heat flux density of 22.7–32.1 mW/m(2) at the top of Mercury’s core suggests a chemically driven magnetic field from 0.02 to 0.21 Gyr after formation. A thermal conductivity of 140–148 Wm(−1) K(−1) is estimated at the center of a Fe–10wt%Ni–10wt%Si Venusian core, suggesting the presence of a solid inner core and an outer core that is at least partially liquid. Nature Publishing Group UK 2022-06-15 /pmc/articles/PMC9200758/ /pubmed/35705611 http://dx.doi.org/10.1038/s41598-022-14130-z Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Berrada, Meryem
Secco, Richard A.
Yong, Wenjun
Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus
title Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus
title_full Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus
title_fullStr Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus
title_full_unstemmed Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus
title_short Resistivity of solid and liquid Fe–Ni–Si with applications to the cores of Earth, Mercury and Venus
title_sort resistivity of solid and liquid fe–ni–si with applications to the cores of earth, mercury and venus
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9200758/
https://www.ncbi.nlm.nih.gov/pubmed/35705611
http://dx.doi.org/10.1038/s41598-022-14130-z
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