Abstract
A first order ferroelectric phase transition has been recently found to take place at Tc=61°C in (CH3NH3)HgCl3. The spin-lattice and spin-spin relaxation times T1 and T2 have shown that the ferroelectric transition is closely connected with reorientation of the CH3NH3 groups rather than with –CH3 and –NH3 rotations. The spin-lattice relaxation time T1 has a discontinuity at Tc connected with an abrupt change in the 35Cl NQR frequency thus demonstrating the occurrence of a phase transition, connected with a dynamic disordering of the CH3–NH3 groups as in the layer structure perovskites.
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