{"@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/1362262945462298112.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1126/science.291.5503.468"}},{"identifier":{"@type":"URI","@value":"https://www.science.org/doi/pdf/10.1126/science.291.5503.468"}}],"dc:title":[{"@value":"Sound Velocities in Iron to 110 Gigapascals"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>\n            The dispersion of longitudinal acoustic phonons was measured by inelastic x-ray scattering in the hexagonal closed-packed (hcp) structure of iron from 19 to 110 gigapascals. Phonon dispersion curves were recorded on polycrystalline iron compressed in a diamond anvil cell, revealing an increase of the longitudinal wave velocity (\n            <jats:italic>V</jats:italic>\n            <jats:sub>P</jats:sub>\n            ) from 7000 to 8800 meters per second. We show that hcp iron follows a Birch law for\n            <jats:italic>V</jats:italic>\n            <jats:sub>P</jats:sub>\n            , which is used to extrapolate velocities to inner core conditions. Extrapolated longitudinal acoustic wave velocities compared with seismic data suggest an inner core that is 4 to 5% lighter than hcp iron.\n          </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382262945462298116","@type":"Researcher","foaf:name":[{"@value":"Guillaume Fiquet"}],"jpcoar:affiliationName":[{"@value":"Laboratoire de Minéralogie et Cristallographie, UMR CNRS 7590, Université Paris VI, 4 Place Jussieu, 75252 Paris cedex 06, France."}]},{"@id":"https://cir.nii.ac.jp/crid/1382262945462298112","@type":"Researcher","foaf:name":[{"@value":"James Badro"}],"jpcoar:affiliationName":[{"@value":"Laboratoire de Minéralogie et Cristallographie, UMR CNRS 7590, Université Paris VI, 4 Place Jussieu, 75252 Paris cedex 06, France."}]},{"@id":"https://cir.nii.ac.jp/crid/1382262945462298115","@type":"Researcher","foaf:name":[{"@value":"François Guyot"}],"jpcoar:affiliationName":[{"@value":"Laboratoire de Minéralogie et Cristallographie, UMR CNRS 7590, Université Paris VI, 4 Place Jussieu, 75252 Paris cedex 06, France."}]},{"@id":"https://cir.nii.ac.jp/crid/1382262945462298113","@type":"Researcher","foaf:name":[{"@value":"Herwig Requardt"}],"jpcoar:affiliationName":[{"@value":"European Synchrotron Radiation Facility, BP220, 38043 Grenoble cedex, France."}]},{"@id":"https://cir.nii.ac.jp/crid/1382262945462298114","@type":"Researcher","foaf:name":[{"@value":"Michael Krisch"}],"jpcoar:affiliationName":[{"@value":"European Synchrotron Radiation Facility, BP220, 38043 Grenoble cedex, France."}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00368075"},{"@type":"EISSN","@value":"10959203"}],"prism:publicationName":[{"@value":"Science"}],"dc:publisher":[{"@value":"American Association for the Advancement of Science (AAAS)"}],"prism:publicationDate":"2001-01-19","prism:volume":"291","prism:number":"5503","prism:startingPage":"468","prism:endingPage":"471"},"reviewed":"false","url":[{"@id":"https://www.science.org/doi/pdf/10.1126/science.291.5503.468"}],"createdAt":"2002-07-27","modifiedAt":"2024-01-13","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360002216113744128","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Effects of Si on the elastic property of Fe at Earth's inner core pressures: First principles study"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232425605120","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Equation of state of Fe3S at room temperature up to 2 megabars"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232482270592","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Sound velocity measurement by inelastic X-ray scattering at high pressure and temperature by resistive heating diamond anvil cell"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004236296920704","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Composition and State of the Core"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021390572918656","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Density deficit of Earth’s core revealed by a multimegabar primary pressure scale"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021390575661952","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Recent Progress in High‐Pressure Experiments on the Composition of the Core"}]},{"@id":"https://cir.nii.ac.jp/crid/1360283690266739840","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Measurements of sound velocity in iron–nickel alloys by femtosecond laser pulses in a diamond anvil cell"}]},{"@id":"https://cir.nii.ac.jp/crid/1360298757168068736","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Sound velocity of hexagonal close-packed iron to the Earth’s inner core pressure"}]},{"@id":"https://cir.nii.ac.jp/crid/1360565165869611520","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Simultaneous sound velocity and density measurements of hcp iron up to 93 GPa and 1100 K: An experimental test of the Birch's law at high 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