1H spin-lattice relaxation rate (T1−1) has been measured using inversion recovery technique in polycrystalline (NH4)2SbF5 system in the temperature range 140–400 K. From the plot of log (M0−M) againstτ, we have estimated two differentT1 corresponding to two inequivalent ammonium ions in the unit cell. Temperature-dependence ofT1 in each case exhibits features of double minima indicating the influence of different correlation times corresponding to different types of motion. Activation energies at different temperature regions have been estimated. Some features of dynamics of motion of the different groups of ions across the phase transitions have been discussed.
Volume 96, 2022
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