Figure 4.

(a) Polyhedral representation of SFO slabs demonstrating the cation order in ilmenite (left) and LiNbO₃ (right). The black circle indicates an antisite dimer defect in polar corundum SFO. (b) [11̅0] zone axis noncentrosymmetric CBED pattern. A mirror plane and two GjonnesMoodie (GM) lines parallel to it are highlighted which correspond to the c glide plane. (c) The whole [11̅0] zone axis CBED pattern showing a mirror plane. The five CBED patterns shown here and in Supporting Information Figure S5 are all collected from different crystallites. (d) TEM SAED along the [11̅0] zone axis—the spots due to double diffraction are marked by arrows. (e) [241] = ⟨100⟩_p zone axis HAADF-STEM image of ScFeO₃. (f) [121̅] = ⟨110⟩_p zone axis HAADF-STEM image of ScFeO₃. The calculated images for the ordered and disordered structure models are superimposed.