Ferroelastic domain switching behaviour is observed in large and high quality LaNbO 4 and NdNbO 4 single crystals grown by the Czochralski method. The domain walls which are (102) and (201) twin planes move when a small stress is applied, and return to the initial positions when the stress is removed. This back - switching behaviour is much influenced by a strain rate: the perfect back-switching is not expected by decreasing the strain rate. This behaviour may be explained by assuming a restoring force due to the restricted rotation of NbO 4 tetrahedra in the distorted Scheelite-structure.
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Tsunekawa et al. (1976) studied this question.
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