Σ = 3, {112̄} Lateral Twin Boundaries in GaP

The structure of Σ = 3, {112̄} lateral twin boundaries in polycrystalline GaP has been investigated by transmission electron microscopy. The orientation of the polar bonding along the lateral twin boundary was characterized by convergent-beam electron diffraction and found to be mirror symmetric across the {112̄} interface. Rigid-body lattice translations and grain boundary dislocations along the boundaries were also characterized. The direction of the translation state between adjacent twin-related grains was studied by the α-fringe contrast technique. Models of the {112̄} interface in the GaP lattice are proposed and compared with the experimental observations.