Twin model for orthorhombic perovskites

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We present a detailed single crystal x-ray diffraction study of twinned orthorhombic perovskites. The diffraction pattern can be indexed on a 2aₚx2aₚx2aₚ lattice, but does not obey cubic symmetry relations. The data can be modelled in space group Pnma with a twin based on a distribution of the b axis over three perpendicular cubic axes. This model allows full structure determination in the presence of up to six twin fractions from single crystal x-ray diffraction data.