Abstract
In the triclinic crystals Rb2MnCl4·2H2O, Cs2MnCl4·2H2O and Cs2CaCl4·2H2O the ferroelastic domain structure has been observed for temperatures from100 K to the dehydration point. On heating at a few degrees before thedehydration point the structure has been found to reorganize. On heating inRb2MnCl4·2H2O andCs2MnCl4·2H2O (butnot in Cs2CaCl4·2H2O) a dielectric anomaly typical of a weak ferroelectric phase transition has been noted. Thelow-frequency dielectric dispersion in the low-temperature phase is attributed to theoscillations of the domain walls. The activation energy of this motion is 73 and67 kJ mol−1 in Rb2MnCl4·2H2O and Cs2MnCl4·2H2O, respectively. In the phase transition region the complex permittivity has been found toshow oscillations as a function of temperature.
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