Acta Cryst. (2013). E69, i7
[ doi:10.1107/S1600536813000731 ]

The defect scheelite-type lanthanum(III) ortho-oxidomolybdate(VI) La_0.667[MoO₄]

T. Schustereit, T. Schleid and I. Hartenbach

Abstract: In scheelite-type La_0.667[MoO₄], one crystallographically unique position with site symmetry -4.. and an occupancy of 2/3 is found for the La³⁺ cation. The cation is surrounded by eight O atoms in the shape of a trigonal dodecahedron. The structure also contains one [MoO₄]^2- anion (site symmetry -4..), which is surrounded by eight vertex-attached La³⁺ cations. The polyhedra around the La³⁺ cations are interconnected via common edges, building up a three-dimensional network, in the tetrahedral voids of which the Mo⁶⁺ cations reside.

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