Figure 3.

Formation and growth of vacancy-type defects with rotated-hexagon kernels in multivacancy structures. The structural changes were obtained under 100 keV electron irradiation. The images are eight subsequent frames recorded during the experiment. The initial configuration in (a) consists of three divacancies in the armchair orientation, in the final configuration (h) 24 atoms are missing. Scale bar is 1 nm. Reprinted with permission from Ref. [55], Copyright (2011) by the American Physical Society.