Abstract
Thin films of LiI have a metastable hexagonal modification (wurtzite) which is long-lived even at room temperature. Both this modification and the usual rock-salt form can be thought of as close-packed I -ions with the Li + ions in either small volume tetrahedral or in large volume octahedral interstices. In the rock-salt phase the Li + ion “rattles” around in the large site with a frequency of only 144 cm -1 whereas the equivalent frequency of the hexagonal modification is 268 cm -1.
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