{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360004229806334080.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1002/2016jb012968"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2016JB012968"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/2016JB012968"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1002/2016JB012968"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JB012968"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Thermoelastic properties of liquid Fe‐C revealed by sound velocity and density measurements at high pressure"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Carbon is one of the possible light elements in the cores of the terrestrial planets. The <jats:italic>P</jats:italic> wave velocity (<jats:italic>V<jats:sub>P</jats:sub></jats:italic>) and density (<jats:italic>ρ</jats:italic>) are important factors for estimating the chemical composition and physical properties of the core. We simultaneously measured the <jats:italic>V<jats:sub>P</jats:sub></jats:italic> and <jats:italic>ρ</jats:italic> of Fe‐3.5 wt % C up to 3.4 GPa and 1850 K by using ultrasonic pulse‐echo method and X‐ray absorption methods. The <jats:italic>V<jats:sub>P</jats:sub></jats:italic> of liquid Fe‐3.5 wt % C decreased linearly with increasing temperature at constant pressure. The addition of carbon decreased the <jats:italic>V<jats:sub>P</jats:sub></jats:italic> of liquid Fe by about 2% at 3 GPa and 1700 K and decreased the Fe density by about 2% at 2 GPa and 1700 K. The bulk modulus of liquid Fe‐C and its pressure (<jats:italic>P</jats:italic>) and temperature (<jats:italic>T</jats:italic>) effects were precisely determined from directly measured <jats:italic>ρ</jats:italic> and <jats:italic>V<jats:sub>P</jats:sub></jats:italic> data to be <jats:italic>K</jats:italic><jats:sub>0,1700 K</jats:sub> = 83.9 GPa, d<jats:italic>K<jats:sub>T</jats:sub></jats:italic>/d<jats:italic>P</jats:italic> = 5.9(2), and d<jats:italic>K<jats:sub>T</jats:sub>/</jats:italic>d<jats:italic>T</jats:italic> = −0.063<jats:ext-link xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"#jgrb51854-disp-0008\"/> GPa/K. The addition of carbon did not affect the isothermal bulk modulus (<jats:italic>K<jats:sub>T</jats:sub></jats:italic>) of liquid Fe, but it decreased the d<jats:italic>K/</jats:italic>d<jats:italic>T</jats:italic> of liquid Fe. In the <jats:italic>ρ‐V<jats:sub>P</jats:sub></jats:italic> relationship, <jats:italic>V<jats:sub>P</jats:sub></jats:italic> increases linearly with <jats:italic>ρ</jats:italic> and can be approximated as <jats:italic>V<jats:sub>P</jats:sub></jats:italic> (m/s) = −6786(506) + 1537(71) × <jats:italic>ρ</jats:italic> (g/cm<jats:sup>3</jats:sup>), suggesting that Birch's law is valid for liquid Fe‐C at the present <jats:italic>P‐T</jats:italic> conditions. Our results imply that at the conditions of the lunar core, the elastic properties of an Fe‐C core are more affected by temperature than those of Fe‐S core.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004229806333956","@type":"Researcher","foaf:name":[{"@value":"Yuta Shimoyama"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Space Science Osaka University  Toyonaka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806333955","@type":"Researcher","foaf:name":[{"@value":"Hidenori Terasaki"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Space Science Osaka University  Toyonaka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806334083","@type":"Researcher","foaf:name":[{"@value":"Satoru Urakawa"}],"jpcoar:affiliationName":[{"@value":"Department of Earth Sciences Okayama University  Okayama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806334082","@type":"Researcher","foaf:name":[{"@value":"Yusaku Takubo"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Space Science Osaka University  Toyonaka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806334080","@type":"Researcher","foaf:name":[{"@value":"Soma Kuwabara"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Space Science Osaka University  Toyonaka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806334086","@type":"Researcher","foaf:name":[{"@value":"Shunpachi Kishimoto"}],"jpcoar:affiliationName":[{"@value":"Department of Earth Sciences Okayama University  Okayama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806333954","@type":"Researcher","foaf:name":[{"@value":"Tetsu Watanuki"}],"jpcoar:affiliationName":[{"@value":"Quantum Beam Science Center Japan Atomic Energy Agency  Hyogo Japan"},{"@value":"Now at National Institutes for Quantum and Radiological Science and Technology Quantum Beam Science Research Directorate  Hyogo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806334085","@type":"Researcher","foaf:name":[{"@value":"Akihiko Machida"}],"jpcoar:affiliationName":[{"@value":"Quantum Beam Science Center Japan Atomic Energy Agency  Hyogo Japan"},{"@value":"Now at National Institutes for Quantum and Radiological Science and Technology Quantum Beam Science Research Directorate  Hyogo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806334084","@type":"Researcher","foaf:name":[{"@value":"Yoshinori Katayama"}],"jpcoar:affiliationName":[{"@value":"Quantum Beam Science Center Japan Atomic Energy Agency  Hyogo Japan"},{"@value":"Now at National Institutes for Quantum and Radiological Science and Technology Quantum Beam Science Research Directorate  Hyogo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229806333952","@type":"Researcher","foaf:name":[{"@value":"Tadashi Kondo"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Space Science Osaka University  Toyonaka Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"21699313"},{"@type":"EISSN","@value":"21699356"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Solid Earth"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2016-11","prism:volume":"121","prism:number":"11","prism:startingPage":"7984","prism:endingPage":"7995"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2016JB012968"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/2016JB012968"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1002/2016JB012968"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JB012968"}],"createdAt":"2016-11-03","modifiedAt":"2023-09-03","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781796428288","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"14J01795"},{"@type":"JGN","@value":"JP14J01795"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14J01795/"}],"notation":[{"@language":"ja","@value":"５０　ＧＰａ圧力領域までの鉄‐軽元素融体の密度測定法の確立"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781833880704","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15H05828"},{"@type":"JGN","@value":"JP15H05828"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-15H05828/"}],"notation":[{"@language":"ja","@value":"核－マントル物質の構造と物性"},{"@language":"en","@value":"Structure 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