Sep 3, 2014 - Publication in Acta Materialia Results

Atomic core structure and mobility of [100](010) and [010](100) dislocations in MgSiO₃ perovskite.

 co-authored by P. Hirel, A. Kraych, P. Carrez & P. Cordier has just been published in Acta Materialia, 79, 117-125, doi: 10.1016/j.actamat.2014.07.001

Feb 27, 2014 - Publication in Nature Results

A new model for polycrystalline, olivine-rich rock deformation

A previously neglected type of crystal defect called disclinations can explain how the most abundant mineral in the Earth’s upper mantle is able to deform under stress. This solution to the ‘olivine deformation paradox’, presented this week in Nature, should lead to a better understanding of upper-mantle dynamics — from the atomic scale to global mantle flow.

P. Cordier, S. Demouchy, B. Beausir, V. Taupin, F. Barou & C. Fressengeas (2014) Disclinations provide the missing mechanism for deforming olivine-rich rocks in the mantle. 507, 51-56,  DOI : 10.1038/nature13043.

see also the News & Views from Greg Hirth associated with this publication

Feb 27, 2014 - About disclinations Results

Disclinations are topological defects which share the same origin as dislocations from the Italian school (Volterra, Somigliana)...

Feb 7, 2014 - Publication in Modelling and Simulation in Materials Science and Engineering Results

Modelling [100] and [010] screw dislocations in MgSiO₃ perovskite based on the Peierls-Nabarro-Galerkin model

authored by K. Gouriet, P. Carrez & P. Cordier has been published in Modelling and Simulation in Materials Science and Engineering, 025020 (17pp) doi:10.1088/0965-0393/22/2/025020.