Acta Crystallographica Section E

Structure Reports Online

Volume 65, Part 8 (August 2009)

inorganic compounds

 

The lanthanum(III) molybdate(VI) La₄Mo₇O₂₇

B. van der Wolf, P. Held and P. Becker

Abstract: Crystals of the orthorhombic phase La₄Mo₇O₂₇ (lanthanum molybdenum oxide) were obtained from a non-stoichiometric melt in the pseudo-ternary system La₂O₃-MoO₃-B₂O₃. In the crystal structure, distorted square-antiprismatic [LaO₈] and monocapped square-antiprismatic [LaO₉] polyhedra are connected via common edges and faces into chains along [010]. These chains are arranged in layers that alternate with layers of [MoO₄] and [MoO₅] polyhedra parallel to (001). In the molybdate layers, a distorted [MoO₅] trigonal bipyramid is axially connected to two [MoO₄] tetrahedra, forming a [Mo₃O₁₁] unit.

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