Structure And Energetics Of Extended Defects In Ice I H

dc.creatorSilva Junior D.L.
dc.creatorDe Koning M.
dc.date2012
dc.date2015-06-26T20:30:27Z
dc.date2015-11-26T14:30:41Z
dc.date2015-06-26T20:30:27Z
dc.date2015-11-26T14:30:41Z
dc.date.accessioned2018-03-28T21:34:03Z
dc.date.available2018-03-28T21:34:03Z
dc.identifier
dc.identifierPhysical Review B - Condensed Matter And Materials Physics. , v. 85, n. 2, p. - , 2012.
dc.identifier10980121
dc.identifier10.1103/PhysRevB.85.024119
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84856496743&partnerID=40&md5=4f572fea978f5622fafd8510669c07dc
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/97345
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/97345
dc.identifier2-s2.0-84856496743
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1247180
dc.descriptionWe consider the molecular structure and energetics of extended defects in proton-disordered hexagonal ice I h. Using plane-wave density functional theory (DFT) calculations, we compute the energetics of stacking faults and determine the structure of the 30 and 90 partial dislocations on the basal plane. Consistent with experimental data, the formation energies of all fully reconstructed stacking faults are found to be very low. This is consistent with the idea that basal-plane glide dislocations in ice I h are dissociated into partial dislocations separated by an area of stacking fault. For both types of partial dislocation we find a strong tendency toward core reconstruction through pairwise hydrogen-bond reformation. In the case of the 30 dislocation, the pairwise hydrogen-bond formation leads to a period-doubling core structure equivalent to that seen in zinc-blende semiconductor crystals. For the 90 partial we consider two possible core reconstructions, one in which the periodicity of the structure along the core remains unaltered and another in which it is doubled. The latter is preferred, although the energy difference between both is rather small, so that a coexistence of both reconstructions appears plausible. Our results imply that a mobility theory for dislocations on the basal plane in ice I h should be based on the idea of reconstructed partial dislocations. © 2012 American Physical Society.
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dc.languageen
dc.publisher
dc.relationPhysical Review B - Condensed Matter and Materials Physics
dc.rightsaberto
dc.sourceScopus
dc.titleStructure And Energetics Of Extended Defects In Ice I H
dc.typeArtículos de revistas


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