Abstract
The temperature dependence of the nuclear magnetic resonance in an single crystal grown by the slow evaporation method has been investigated by employing an FT NMR spectrometer. The rotation patterns of the NMR spectra were obtained in three mutually perpendicular planes under an applied magnetic field of 4.7 T. The NMR spectra demonstrate the occurrence of the second-order phase transition at 200 K which is connected with a lowering of the site symmetry. Two kinds of ferroelastic domain below 200 K were measured. In the temperature range of 140-380 K, the nuclear quadrupole coupling constants and asymmetry parameters of in decrease as the temperature increases. The temperature dependence of and is satisfactorily explained with a single torsional frequency of the Li-O ion by simple Bayer theory.
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