Peierls-Nabarro modelling of dislocations in diopside

Abstract : The core structures of dislocations in diopside have been calculated within the Peierls model, which assumes a planar core. 1/2 < 110 > dislocations can dissociate into two collinear partial dislocations. We show that [001] glide is very difficult in (010) and that a non-collinear dissociation of [001](100) (modelled within a Peierls-Nabarro-Galerkin approach) makes glide equally easy in (100) and {110}. A widely spread core structure corresponding to a low lattice friction has been found for [100](010) and [010](100) dislocations which is not supported by mechanical data and, together with TEM observations, suggests that another, probably non-planar core structure is possible for these dislocations.
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Submitted on : Friday, January 21, 2011 - 12:18:25 PM
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Arnaud Metsue, Philippe Carrez, Christophe Denoual, David Mainprice, Patrick Cordier. Peierls-Nabarro modelling of dislocations in diopside. Physics and Chemistry of Minerals, Springer Verlag, 2010, 37 (10), pp.711-720. ⟨10.1007/s00269-010-0370-7⟩. ⟨hal-00558238⟩



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