Phase transitions in boracite Co3B7O13I
Kovalev A.V., Plakhtii V.P., Andreeva G.T.
An intermediate phase (a) has been observed in boracite Co3B7013I between the paraelectric (T5d) and the ferroelectric (С52„) phases. Coexistence of two phases is observed in the region of the transition a«-*-C52v and is a consequence of the internal stresses produced in the course of twinning of the crystal.