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Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy
Knowledge of the sound velocity of core materials is essential to explain the observed anomalously low shear wave velocity (V(S)) and high Poisson’s ratio (σ) in the solid inner core. To date, neither V(S) nor σ of Fe and Fe-Si alloy have been measured under core conditions. Here, we present V(S) an...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8807611/ https://www.ncbi.nlm.nih.gov/pubmed/35105891 http://dx.doi.org/10.1038/s41467-022-28255-2 |
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author | Huang, Haijun Fan, Lili Liu, Xun Xu, Feng Wu, Ye Yang, Gang Leng, Chunwei Wang, Qingsong Weng, Jidong Wang, Xiang Cai, Lingcang Fei, Yingwei |
author_facet | Huang, Haijun Fan, Lili Liu, Xun Xu, Feng Wu, Ye Yang, Gang Leng, Chunwei Wang, Qingsong Weng, Jidong Wang, Xiang Cai, Lingcang Fei, Yingwei |
author_sort | Huang, Haijun |
collection | PubMed |
description | Knowledge of the sound velocity of core materials is essential to explain the observed anomalously low shear wave velocity (V(S)) and high Poisson’s ratio (σ) in the solid inner core. To date, neither V(S) nor σ of Fe and Fe-Si alloy have been measured under core conditions. Here, we present V(S) and σ derived from direct measurements of the compressional wave velocity, bulk sound velocity, and density of Fe and Fe-8.6 wt%Si up to ~230 GPa and ~5400 K. The new data show that neither the effect of temperature nor incorporation of Si would be sufficient to explain the observed low V(S) and high σ of the inner core. A possible solution would add carbon (C) into the solid inner core that could further decrease V(S) and increase σ. However, the physical property-based Fe-Si-C core models seemingly conflict with the partitioning behavior of Si and C between liquid and solid Fe. |
format | Online Article Text |
id | pubmed-8807611 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-88076112022-02-07 Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy Huang, Haijun Fan, Lili Liu, Xun Xu, Feng Wu, Ye Yang, Gang Leng, Chunwei Wang, Qingsong Weng, Jidong Wang, Xiang Cai, Lingcang Fei, Yingwei Nat Commun Article Knowledge of the sound velocity of core materials is essential to explain the observed anomalously low shear wave velocity (V(S)) and high Poisson’s ratio (σ) in the solid inner core. To date, neither V(S) nor σ of Fe and Fe-Si alloy have been measured under core conditions. Here, we present V(S) and σ derived from direct measurements of the compressional wave velocity, bulk sound velocity, and density of Fe and Fe-8.6 wt%Si up to ~230 GPa and ~5400 K. The new data show that neither the effect of temperature nor incorporation of Si would be sufficient to explain the observed low V(S) and high σ of the inner core. A possible solution would add carbon (C) into the solid inner core that could further decrease V(S) and increase σ. However, the physical property-based Fe-Si-C core models seemingly conflict with the partitioning behavior of Si and C between liquid and solid Fe. Nature Publishing Group UK 2022-02-01 /pmc/articles/PMC8807611/ /pubmed/35105891 http://dx.doi.org/10.1038/s41467-022-28255-2 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Huang, Haijun Fan, Lili Liu, Xun Xu, Feng Wu, Ye Yang, Gang Leng, Chunwei Wang, Qingsong Weng, Jidong Wang, Xiang Cai, Lingcang Fei, Yingwei Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy |
title | Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy |
title_full | Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy |
title_fullStr | Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy |
title_full_unstemmed | Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy |
title_short | Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy |
title_sort | inner core composition paradox revealed by sound velocities of fe and fe-si alloy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8807611/ https://www.ncbi.nlm.nih.gov/pubmed/35105891 http://dx.doi.org/10.1038/s41467-022-28255-2 |
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