Abstract
Lanthanum tungstate α-La2W2O9 has been successfully synthesized by the ceramic route. Its crystal structure was determined ab initio from neutron diffraction data (space group P1; No. 2; a=7.2489(1) Å b=7.2878(1) Å c=7.0435(1) Å α=96.367(1)°, β=94.715(1)°, γ=70.286(1)°; Z=2; reliability factors: Rp=6.0%, Rwp=6.9%, RB=3.0%). The structure exhibits isolated [W4O18]12− groups in the form of rings involving [WO6] octahedra alternating with [WO5] trigonal bipyramids sharing corners. These rings are inserted in the 3D framework built by the 9- and 10-fold coordination polyhedra of the lanthanum atoms.
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