Mixed occupancy: the crystal structure of scheelite-type LiLu[MoO].

Coarse colorless single crystals of lithium lutetium bis-[orthomolybdate(VI)], LiLu[MoO], were obtained as a by-product from a reaction aimed at lithium derivatives of lutetium molybdate. The title compound crystallizes in the scheelite structure type (tetra-gonal, space group 4/) with two formula units per unit cell. The Wyckoff position 4 (site symmetry ) comprises a mixed occupancy of Li and Lu cations in a 1:1 ratio.