Show simple item record

dc.contributor.authorvan Driel, J
dc.contributor.authorSchusteritsch, G
dc.contributor.authorBrodholt, JP
dc.contributor.authorDobson, DP
dc.contributor.authorPickard, CJ
dc.date.accessioned2021-01-13T17:22:31Z
dc.date.available2021-01-13T17:22:31Z
dc.date.issued2020
dc.date.submitted2019-09-11
dc.identifier.issn0342-1791
dc.identifier.others00269-019-01079-1
dc.identifier.other1079
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/316149
dc.description.abstract<jats:title>Abstract</jats:title><jats:p>MgO makes up about 20% of the Earth’s lower mantle; hence, its rheological behaviour is important for the dynamics and evolution of the Earth. Here, we investigate the strength of twin boundaries from 0 to 120 GPa using DFT calculations together with structure prediction methods. As expected, we find that the energy barrier and critical stress for shear-coupled migration of the 310/[001] interface vary strongly with pressure. However, what is surprising is that the twin boundary also exhibits sudden strong discontinuities in strength which can both weaken and strengthen the boundary with increasing pressure. Since twin boundary migration is a proposed mechanism for both deformation and seismic attenuation in MgO, these results may suggest that MgO can undergo sudden changes in rheology due to transitions in grain boundary structure. The multiplicity of interfaces, however, necessitates the need for further studies to examine the role that phase changes in grain boundary structure play in mediating polycrystalline plasticity in the Earth.</jats:p>
dc.languageen
dc.publisherSpringer Science and Business Media LLC
dc.rightsAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectOriginal Paper
dc.subjectGrain boundaries
dc.subjectLower mantle
dc.subjectMgO
dc.subjectDiscontinuities
dc.subjectRheology
dc.subjectDensity functional theory
dc.titleThe discontinuous effect of pressure on twin boundary strength in MgO
dc.typeArticle
dc.date.updated2021-01-13T17:22:30Z
prism.issueIdentifier2
prism.publicationNamePhysics and Chemistry of Minerals
prism.volume47
dc.identifier.doi10.17863/CAM.63257
dcterms.dateAccepted2019-12-02
rioxxterms.versionofrecord10.1007/s00269-019-01079-1
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidvan Driel, J [0000-0003-1971-193X]
dc.identifier.eissn1432-2021
pubs.funder-project-idRoyal Society (WM150023)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P022596/1)
cam.issuedOnline2020-01-14


Files in this item

Thumbnail
Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record

Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's licence is described as Attribution 4.0 International (CC BY 4.0)