A Molybdenyl Chloromonophosphate with an Intersecting Tunnel Structure: Ba₃Li₂Cl₂(MoO)₄(PO₄)₆

Author： Borel M.M. Leclaire A. Chardon J. Provost J. Raveau B.

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.141, Iss.2, 1998-12, pp. : 587-593

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Abstract

A new molybdenyl chloromonophosphate, Ba₃Li₂Cl₂(MoO)₄ (PO₄)₆, has been synthesized. It crystallizes in the space group P2₁2₁2₁, with a=9.1768(4), b=15.660(1), and c=18.117(2) Å. This original pseudotetragonal structure forms an intersecting tunnel framework [Mo₄P₆O₂₈]_∞ built up from [Mo₂P₂O₁₂]_∞ layers interconnected through single PO₄ tetrahedra. The [Mo₂P₂O₁₂]_∞ layers derive from the perovskite structure by replacing one octahedron out of two by one PO₄ tetrahedron. The Li⁺, Ba²⁺, and Cl^- species are distributed in the [100], [001], [201], and [201] tunnels forming intersecting rows. Two sorts of polyhedra are found for Li⁺: LiO₃Cl tetrahedra and LiO₃ triangular groups. The susceptibility measurements suggest a bidimensional antiferromagnetic behavior between 12 and 20 K, whereas a peak at 10 K is attributed to canting phenomena.