NMR Study of the Ferroelectric Transitions in Diglycine Nitrate and Trissarcosine Calcium Chloride

A proton magnetic resonance spin–lattice relaxation and second moment study of the ferroelectric transitions in diglycine nitrate (DGN), trissarcosine calcium chloride (TSCC), and its deuterated analog has been performed. The results support the order–disorder model of the ferroelectric transition in these compounds and demonstrate the freezing in of a “flipping” mode on going to the ferroelectric phase in analogy with triglycine sulphate. Deuteration results in a shift of the Curie temperature of TSCC from 127 to 149°K.