The atomic structure of ∑=33{144}〈011〉 (θ=20.05°) tilt grain boundary in germanium

In case of germanium, the atomic structure of σ = 33{144} (θ = 20.05°) tilt grain boundary was analyzed. It was found that it contained a glide mirror symmetry and not a mirror plane symmetry. The high resolution transmission electron microscopy images were combined with energy calculations of relaxed structures described using semi-emprical potentials to show the glide mirror symmetry. Results showed that the atomic structure at grain boundary was better described by the model consisting of a tetracoordinated structure made up of L⁺, L^- and C structural units. This structure was more stable than the purely symmetrical one.