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dc.contributor.authorZhang, Zhigang
dc.contributor.authorCsányi, Gábor
dc.contributor.authorAlfè, Dario
dc.contributor.authorZhang, Yigang
dc.contributor.authorLi, Juan
dc.contributor.authorLiu, Jin
dc.date.accessioned2022-03-08T00:30:30Z
dc.date.available2022-03-08T00:30:30Z
dc.date.issued2022-02-28
dc.identifier.issn0094-8276
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/334742
dc.description.abstractSolubility of oxygen and silicon in the iron-alloying liquids is important for constraining the core composition over the Earth's history. In this study, we systematically simulated the free energies of Fe-O-Si ternary liquids from 3000 K, 55 GPa to 6000 K, and 330 GPa. We found that temperature and pressure have remarkable influences on the free energies, and the nonideality of mixing is important for the chemical potentials even at high temperatures. Equilibrating with SiO$_{2}$ phase, Fe-O-Si liquids significantly enhance the solubility of Si and O simultaneously with increasing temperature. Considering the secular cooling of the Earth's core, this leads to high precipitation rates of SiO$_{2}$ once it was saturated, which would efficiently drive ancient geodynamo. If the evolution of Earth's core started from an oxygen-poor composition, later incorporations of oxygen seem to be needed to reach a core composition compatible with geophysical observations.
dc.publisherAmerican Geophysical Union (AGU)
dc.rightsAll Rights Reserved
dc.rights.urihttp://www.rioxx.net/licenses/all-rights-reserved
dc.titleFree Energies of Fe‐O‐Si Ternary Liquids at High Temperatures and Pressures: Implications for the Evolution of the Earth's Core Composition
dc.typeArticle
dc.date.updated2022-03-05T16:19:47Z
prism.issueIdentifier4
prism.publicationDate2022
prism.publicationNameGeophysical Research Letters
prism.volume49
dc.identifier.doi10.17863/CAM.82172
dcterms.dateAccepted2022-02-07
rioxxterms.versionofrecord10.1029/2021gl096749
rioxxterms.versionAM
dc.contributor.orcidZhang, Z [0000-0001-8666-1026]
dc.contributor.orcidLi, J [0000-0001-5480-7641]
dc.contributor.orcidLiu, J [0000-0002-1670-8199]
dc.identifier.eissn1944-8007
rioxxterms.typeJournal Article/Review
cam.issuedOnline2022-02-10
cam.orpheus.successVoR added to record with remainder of 6 month embargo
cam.depositDate2022-03-05
pubs.licence-identifierapollo-deposit-licence-2-1
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
rioxxterms.freetoread.startdate2022-08-10


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