Fig. 3.

Shear deformation of the fcc phases for the $\left\{111\right\}\langle 11\overline{2}\rangle$ slip system. Snapshots in A–C show typical images of oxygen positions of the structure before deformation, an intermediate stage, and immediately after accruing permanent deformation, respectively. The red dashed line in C indicates the slip plane across which deformation has occurred. D–G display stress–strain curves obtained for fully atomistic systems at 2,500 K/334 GPa, 3,000 K/340 GPa, 3,500 K/346 GPa, and 4,000 K/353 GPa, respectively. Corresponding results in the absence of explicit protons are shown in H–K.