Atomic core structure and mobility of [100](010) and [010](100) dislocations in MgSiO3 perovskite - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2014

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

Résumé

The plastic behavior of MgSiO3 perovskite is investigated under pressure conditions similar to those encountered in the Earth’s lower mantle. The core structures of dislocations with edge and screw characters are determined by means of atomic-scale simulations for the [1 0 0](0 1 0) and [0 1 0](1 0 0) slip systems. The corresponding Peierls stresses increase monotonously with increasing pressure. The edge [0 1 0](1 0 0) dislocation is found to dissociate by climb and to become sessile at high pressure ( GPa). These findings are compared with a continuum Peierls–Nabarro model and with published results in other perovskite materials.
Fichier principal
Vignette du fichier
1-s2.0-S1359645414004972-main.pdf (2.85 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02544916 , version 1 (16-04-2020)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification - CC BY 4.0

Identifiants

Citer

Pierre Hirel, Antoine Kraych, Philippe Carrez, Patrick Cordier. Atomic core structure and mobility of [100](010) and [010](100) dislocations in MgSiO3 perovskite. Acta Materialia, 2014, Acta Materialia, 79, pp.117-125. ⟨10.1016/j.actamat.2014.07.001⟩. ⟨hal-02544916⟩
30 Consultations
43 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More