{"@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/1360017282467199488.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2138/am-2022-8452"}},{"identifier":{"@type":"URI","@value":"https://pubs.geoscienceworld.org/msa/ammin/article-pdf/108/11/2043/5994694/am-2022-8452.pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Magnetism and equation of states of fcc FeH<i>x</i> at high pressure"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n               <jats:p>Hydrogen is a strong candidate for light alloying elements in terrestrial cores. Previous first-principles studies on non-stoichiometric hexagonal close-packed (hcp) and double hexagonal close-packed (dhcp) FeHx predicted a discontinuous volume expansion across the magnetic phase transition from non-magnetic (NM) or antiferromagnetic (AFM) to ferromagnetic (FM) state with increasing the hydrogen content, x at 0 K. However, previous high-pressure and -temperature neutron diffraction experiments on face-centered cubic (fcc) FeHx did not reveal such nonlinearity. The discrepancy between theory and experiment may be due to differences in the crystal structure, magnetism, or temperature. In this study, we computed the equation of states for fcc FeHx using the Korringa-Kohn-Rostoker method combined with the coherent potential approximation (KKR-CPA). In addition to the four types of ground-state magnetism (FM, AFM-I, AFM-II, and NM), we calculated the local magnetic disorder (LMD) state, which approximates the paramagnetic (PM) state with local spin moment above the Curie temperature. Our results show that even though FM, AFM-I, AFM-II, and NM calculations predict a discontinuity in the volume at 0 K, the volume becomes continuous above the Curie temperature, consistent with the previous neutron experiment. From the enthalpy comparison at 0 K, FM fcc FeH (x = 1) becomes the NM state above ~48 GPa. The magnetic transition pressure decreases with decreasing hydrogen content. Therefore, below the magnetic transition pressure, local spin moments affect the density and elastic wave velocity of fcc FeHx, which may be important for small terrestrial bodies such as Mercury and Ganymede. By contrast, at the Earth’s core pressure above 135 GPa, fcc FeHx becomes NM. Thus, we calculated the density and bulk sound velocity as a function of pressure at 0 K for NM fcc FeHx. The density at 360 GPa decreases with increasing hydrogen content, with FeH0.5 best matching the preliminary reference Earth model (PREM) of the inner core. Since the density decreases with increasing temperature, this value constrains the upper limit of hydrogen content, assuming that the inner core is fcc FeHx. On the other hand, the bulk sound velocity at 360 GPa increases with increasing hydrogen content, with FeH0.3 best matching the PREM, which may give a lower bound. Assuming that Poisson’s ratio of the FeHx alloy is equal to that of the inner core, we examined the effects of temperature on density and bulk sound velocity. The results suggest that the fcc FeHx alloy alone cannot explain the inner core density and bulk sound velocity simultaneously unless the temperature is extremely low (T &lt; 4000 K).</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380017282467199238","@type":"Researcher","foaf:name":[{"@value":"Hitoshi Gomi"}],"jpcoar:affiliationName":[{"@value":"Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1 Ōokayama, Meguro, Tokyo 152-8550, Japan"},{"@value":"Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380017282467199360","@type":"Researcher","foaf:name":[{"@value":"Kei Hirose"}],"jpcoar:affiliationName":[{"@value":"Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1 Ōokayama, Meguro, Tokyo 152-8550, Japan"},{"@value":"Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0003004X"},{"@type":"EISSN","@value":"19453027"}],"prism:publicationName":[{"@value":"American Mineralogist"}],"dc:publisher":[{"@value":"Mineralogical Society of America"}],"prism:publicationDate":"2023-11-01","prism:volume":"108","prism:number":"11","prism:startingPage":"2043","prism:endingPage":"2050"},"reviewed":"false","url":[{"@id":"https://pubs.geoscienceworld.org/msa/ammin/article-pdf/108/11/2043/5994694/am-2022-8452.pdf"}],"createdAt":"2022-12-08","modifiedAt":"2023-11-01","project":[{"@id":"https://cir.nii.ac.jp/crid/1040288137393834112","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21H04968"},{"@type":"JGN","@value":"JP21H04968"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21H04968/"}],"notation":[{"@language":"ja","@value":"超高圧実験による地球コアの軽元素組成の解明"},{"@language":"en","@value":"Light elements in the Earth's core revealed by ultrahigh-pressure experiments"}]},{"@id":"https://cir.nii.ac.jp/crid/1040291932592525184","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22K03754"},{"@type":"JGN","@value":"JP22K03754"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K03754/"}],"notation":[{"@language":"ja","@value":"第一原理計算と機械学習による地球内核の化学組成探索"},{"@language":"en","@value":"Chemical composition of the Earth's inner core from first-principles calculations and machine learning"}]},{"@id":"https://cir.nii.ac.jp/crid/1040857512431364608","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22K21344"},{"@type":"JGN","@value":"JP22K21344"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K21344/"}],"notation":[{"@language":"ja","@value":"太陽系に広がる惑星環境における前生命化学進化と分子システム誕生の多様性の解明"},{"@language":"en","@value":"Understanding of the diversity of prebiotic chemistries and emergence of molecular systems in various planetary environments in the Solar 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