DYNAMICAL PROPERTIES OF THE Li+, 3H2O HYDRATE IN THE INTERLAMELLAR SPACE OF A SWELLING CLAY

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Abstract
Li+ 3H2O is the lowest stable hydration state of the lithium hectorite. From the IR spectroscopy data (bending and stretching frequencies, integrated intensities) the water in the clay interlamellar space appears in a state intermediate between gaz and liquid, not involved in any hydrogen bond. From 1H and 7Li NMR data, the dynamical model established is explained by two reorientational motions : . a fast motion of the water molecule around C2 axis ; . a slow rotation of the whole hydrate with respect to the c axis of the clay platelet. By quasi-elastic neutron scattering, . the correlation times of the both motions are determined, . the anisotropy of the motions is proved, . the absence of thermal activation for the both motions between 240 and 300 K is shown

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