The crystal structure of hexagonal ErMnO3, erbium manganese trioxide, has been determined at room temperature. It is isomorphous with YMnO3. Although we observed inversion twinning, similar to YMnO3, the twin fractions do not have a 1:1 ratio, and the crystals are expected to show net ferroelectricity.
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Aken et al. (2001) studied this question.