Abstract
Abstract Electron optical structure imaging of haematite (α-Fe2O3) in two projections has allowed the microscopic twinning elements of rhombohedral twins to be determined. The twin is a pure 180° rotation about [0111], the twinning direction, combined with a parallel translation of ⅙[0111]. The twinning plane (0112) forms a perfectly coherent interface, consisting of face and edge-shared octahedra with no change in nearest-neighbour coordination. A search for alternative structural models yielded none which could reproduce the experimental images.
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