Abstract
Proton spin lattice relaxation time (T1), measured as a function of temperature in the range 375–77 K, shows slope changes at 333, 221 and 111 K, in addition to a first order phase transition at 150K. The observed T1 behaviour and second moment (M2) variation with temperature are explained on the basis of the different possible motions of CH3 and NH3 groups.
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