Single crystals of Rb2 CoBr4 were grown by the Bridgman method. DTA and the dielectric constant measurements revealed that the normal-incommensurate transition point T i is 60°C and the lock-in transition (Curie temperature T c) is—81°C (on heating). The temperature dependence of spontaneous polarization P s, coercive field E c, and antiferroelectric polarization P AF were measured for a single-crystal sample down to liquid nitrogen temperature.
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Shimizu et al. (1990) studied this question.
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