Simulation of the twin interface in graphite Original Research Article

The {112̄1} twin interface in graphite is studied using an analytical model for graphite developed earlier. It is shown that the twin interface, composed of a special atomic geometry (‘8–4–8’ polygons), can be stable and mobile, which confirms the model previously proposed by Platt (Z Kristallogr 1957;109:226). The simulation study indicates that the {112̄1} twin interface could consist of a special local atomic structure, namely, the 8–4–8 polygons. The boundary composed of such structure has the energy of 0.09 J/m2 and the activation energy of 3 eV for migration (mostly due to the formation of a kink along the boundary line). The result suggests that existence of a 8–4–8 structure at the twin interface is not improbable compared to the more widely accepted dislocation model.