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Low frequency dielectric investigations of disordered trimethylammonium cations are presented and discussed. Ordering process of N(CH3)3H+ cations are described by means of an asymmetry of doubleminimum potential. Pyroelectric experiment on TMACA provided clear evidence of another continuous phase transition at 127 K between two ferroelectric phases connected most probably with a motion of CH3 groups.
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Bator et al. (1993) studied this question.
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