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The results demonstrate that the thermodynamic Grüneisen parameter of liquid iron alloy decreases with increasing pressure, temperature, and hydrogen concentration, indicating a relatively small temperature gradient in the outer core when hydrogen is present. Along such temperature profile, both the density and compressional velocity of liquid iron containing ~1 wt % hydrogen match seismological observations. It suggests that hydrogen could be a primary light element in the core, although the shear velocity of the inner core is not reconciled with solid Fe‐H alloy and thus requires another impurity element.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1030007827730869762","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"60726991"},{"@type":"NRID","@value":"1000060726991"},{"@type":"NRID","@value":"9000003215602"},{"@type":"NRID","@value":"9000401875190"},{"@type":"NRID","@value":"9000367865909"},{"@type":"NRID","@value":"9000003357968"},{"@type":"NRID","@value":"9000402042433"}],"foaf:name":[{"@value":"Koichiro Umemoto"}],"jpcoar:affiliationName":[{"@value":"Earth‐Life Science Institute Tokyo Institute of Technology  Tokyo 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Hirose"}],"jpcoar:affiliationName":[{"@value":"Earth‐Life Science Institute Tokyo Institute of Technology  Tokyo Japan"},{"@value":"Laboratory of Ocean‐Earth Life Evolution Research Japan Agency for Marine‐Earth Science and Technology  Kanagawa Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00948276"},{"@type":"EISSN","@value":"19448007"}],"prism:publicationName":[{"@value":"Geophysical Research Letters"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2015-09-28","prism:volume":"42","prism:number":"18","prism:startingPage":"7513","prism:endingPage":"7520"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2015GL065899"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/2015GL065899"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1002/2015GL065899"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2015GL065899"}],"createdAt":"2015-09-10","modifiedAt":"2023-09-05","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782188819200","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"24000005"},{"@type":"JGN","@value":"JP24000005"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24000005/"}],"notation":[{"@language":"ja","@value":"地球中心核の物質と進化の解明"},{"@language":"en","@value":"Materials property and evolution of Earth's 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