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dc.contributor.authorZhang, Jurong
dc.contributor.authorLv, Jian
dc.contributor.authorLi, Hefei
dc.contributor.authorFeng, Xiaolei
dc.contributor.authorLu, Cheng
dc.contributor.authorRedfern, Simon AT
dc.contributor.authorLiu, Hanyu
dc.contributor.authorChen, Changfeng
dc.contributor.authorMa, Yanming
dc.date.accessioned2019-01-08T00:30:50Z
dc.date.available2019-01-08T00:30:50Z
dc.date.issued2018-12-21
dc.identifier.issn0031-9007
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/287601
dc.description.abstractThere is compelling geochemical evidence for primordial helium trapped in Earth's lower mantle, but the origin and nature of the helium source remain elusive due to scarce knowledge on viable helium-bearing compounds that are extremely rare. Here we explore materials physics underlying this prominent challenge. Our structure searches in conjunction with first-principles energetic and thermodynamic calculations uncover a remarkable helium-bearing compound FeO_{2}He at high pressure-temperature conditions relevant to the core-mantle boundary. Calculated sound velocities consistent with seismic data validate FeO_{2}He as a feasible constituent in ultralow velocity zones at the lowermost mantle. These mutually corroborating findings establish the first and hitherto only helium-bearing compound viable at pertinent geophysical conditions, thus providing vital physics mechanisms and materials insights for elucidating the enigmatic helium reservoir in deep Earth.
dc.description.sponsorshipUK Natural Environment Research Council, through grant NE/P012167/1
dc.format.mediumPrint
dc.languageeng
dc.publisherAmerican Physical Society (APS)
dc.rightsPublisher's own licence
dc.titleRare Helium-Bearing Compound FeO_{2}He Stabilized at Deep-Earth Conditions.
dc.typeArticle
prism.issueIdentifier25
prism.publicationDate2018
prism.publicationNamePhys Rev Lett
prism.startingPage255703
prism.volume121
dc.identifier.doi10.17863/CAM.34913
dcterms.dateAccepted2018-11-13
rioxxterms.versionofrecord10.1103/PhysRevLett.121.255703
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-12
dc.contributor.orcidRedfern, Simon [0000-0001-9513-0147]
dc.identifier.eissn1079-7114
rioxxterms.typeJournal Article/Review
pubs.funder-project-idNatural Environment Research Council (NE/P012167/1)
cam.issuedOnline2018-12-21
cam.orpheus.successThu Jan 30 10:52:48 GMT 2020 - Embargo updated
rioxxterms.freetoread.startdate2100-01-01


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