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Lattice parameters of the orthorhombic perovskites RMO₃ ( R=rare earth, M=Ti, V, {}, Ni, and Ga) have been simulated based on the ionic M-O bond length and rigid MO6/2 octahedra. Comparison with experimental data shows that the long-standing lattice-parameter anomaly generally found for the larger R³⁺ ions in these families is caused by a structural feature that is not revealed by the geometric tolerance factor widely used for the perovskites.
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Zhou et al. (2005) studied this question.
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