Li−LSX (Li−faujasite with Si/Al = 1), cubic at room
temperature, is orthorhombic (Fddd) at 10 K. In
the
room-temperature Fd3̄ phase, Li cations in the
supercage are evenly distributed between
2-fold-coordinated
sites III and III‘, in close agreement with the cation distribution in
Na−X. The cubic−orthorhombic phase
transition implies extensive redistribution of strain through the
lattice and displacement of Li cations. In the
low-temperature Fddd phase the occupancy of sites II is
reduced, and nearly half the Li cations are in the
supercage, most of them in a new site III‘, midway between neighboring
sites II.
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