Abstract
The temperature dependence of the 1H relaxation times T 1, T 1 ρ and T 1 D were studied in the ferroelectric (CH 3NH 3) 5Bi 2Br 11. Three kinds of motions of the methylammonium cation, i.e. (1) rotations of the CH 3 and NH 3 groups about C 3 axis, (2) reorientation of the whole cation about C 3 axis forming an angle α = 13° with the C 3 axis of NH 3 and CH 3 groups, (3) 180° flip motion of the methylammonium cation, have been observed separately. The small activation energies of these motions imply that the cations experience a weak crystal field.
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