Add time:08/06/2019         Source:sciencedirect.com

Molecular and ionic mobility in the pyroelectric solid hydrate LiClO4 · 3H2O has been studied by 1H and 7Li NMR. Spin-lattice relaxation times in the laboratory and rotating frames and dipolar relaxation times have been measured as a function of temperature for polycrystalline samples, and as a function of orientation for single crystals. To identify the motion responsible for the relaxation, measurements on normal LiClO4 · 3H2O were supplemented by measurements on a deuterated sample. Two different processes contribute to the relaxation: H2O flip motions with an activation energy of 41 kJ/mol, and a translational diffusion of Li+ with an activation energy of 74 kJ/mol. The pre-exponential factors of the Arrhenius relations for the correlation time of these motions are 1.8 × 10−15 and 2.0 × 10−16 s, respectively. The pre-exponential factor obtained for the flip motion is in excellent agreement with the value predicted by dynamic rate theory.

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