Figure 6
From: Defects in bilayer silica and graphene: common trends in diverse hexagonal two-dimensional systems
(a) 80 kV AC-HRTEM image of grain boundaries in crystalline HBS.
(b) Example of a (1,0) grain boundary in HBS. The dashed blue lines indicates the boundary of the periodically repeating cell. The Burgers' vector, (b) for the (1,0) dislocation is indicated in the figure along with a corresponding Burgers' circuit in green. Only connecting lines between the structural units are displayed with non-hexagonal rings highlighted in pink. (c) Formation energy of different grain boundaries in HBS. CFF calculations are shown as filled symbols and DFT calculations as open symbols.
