The structure of LiNbO3, determined by Abrahams and co-workers, is more easily understood if it is described in terms of displacement parameters from an idealized structure with hexagonally close-packed oxygen atoms. The relationship to perovskite, the significance of the thermal changes, and the atomic movements in the ferroelectric reversal, all become more obvious and predictable in this way.
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H. D. Megaw (1968) studied this question.