The core structure of screw dislocations with 001 Burgers vector inMg(2)SiO(4) olivine

S Mahendran and P Carrez and P Cordier, COMPTES RENDUS PHYSIQUE, 22, 7-18 (2021).

DOI: 10.5802/crphys.27

In this study, we report atomistic calculations of the core structure of screw dislocations with 001 Burgers vector in Mg2SiO4 olivine. Computations based on the THB1 empirical potential set for olivine show that the stable core configurations of the screw dislocations correspond to a dissociation in 110 planes involving collinear partial dislocations. As a consequence, glide appears to be favorable in 110 planes at low temperature. This study also highlights the difference between dislocation glide mechanism in 110 versus (010) or (100) for which glide is expected to occur through a locking-unlocking mechanism.

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