Abstract
Proton NMR relaxation measurements have been carried out in anti-ferroelectric Betaine phosphate (BP), ferroelectric Betaine phosphite (BPI) and the mixed system BPI(1− x )BP x , at 11.4 MHz and 23.3 MHz from 300 K to 80 K for x = 0.0, 0.25, 0.45, 0.85, and 1.0. The temperature dependence of spin lattice relaxation time T 1 exhibits two minima as expected from the BPP model in BP and BPI. The Larmor frequency dependence of T 1 in the mixed system is rather unusual and exhibits different slopes for the low temperature wings at the two frequencies, which is a clear experimental evidence of the presence of different methyl groups with different activation energies (Ea ) indicating disorder.
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