Abstract
The NMR spectrum and spin-lattice relaxation times, <TEX>$T_1$</TEX>, of the <TEX>$^{1}H$</TEX> nuclei in <TEX>$(NH_{4})_{2}Cd_{2}(SO_{4})_{3}$</TEX> single crystals were obtained. The two minima in <TEX>$T_1$</TEX> in the paraelectric phase are attributed to the reorientational motions of the <TEX>$NH_{4}^{+}$</TEX> groups. The <TEX>$^{1}H\;T_1$</TEX> of the <TEX>$(NH_{4})_{2}Cd_{2}(SO_{4})_{3}$</TEX> crystals can be described with Bloembergen- Purcell-Pound (BPP) theory. The experimental value of <TEX>$T_1$</TEX> can be expressed in terms of an isotropic correlation time <TEX>${\tau}_H$</TEX> for molecular motions by using the BPP theory, and determine the role of protons in these processes.
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