Abstract
Lithium mobility in has been followed by NMR and impedance spectroscopies. From this analysis, three stages have been distinguished. (1) Below 230 K, lithium occupies preferentially the octahedral sites of the NASICON structure. (2) Between 230 and 330 K, a low correlated and thermally activated lithium motion, with , is operating, as deduced from both techniques. (3) Above 330 K, the activation energy decreases and a more extended lithium ionic motion is established. As the lithium mobility increases, progressive occupation of the eight-coordinated sites is deduced from NMR data.
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