Acta Cryst. (2005). E61, i231-i233  [ doi:10.1107/S1600536805022269 ]

NASICON-type Li_2.5K_0.16Na_0.34Cr₂(PO₄)₃

S. Kouass and H. Boughzala

Abstract: A new NASICON-type chromium(III) phosphate, K_0.16Na_0.34Li_2.5Cr₂(PO₄)₃, lithium sodium potassium dichromate tris(phosphate), has been prepared by solid-state reaction. It consists of CrO₆ octahedra and PO₄ tetrahedra sharing corners to form a three-dimensional framework. The monovalent cations are located in the M1 (six-coordinate) and M2 (four-coordinate) sites of the framework. The M1 site is occupied by Na⁺ and K⁺ cations with 69 (3) and 31 (3)% occupancy, respectively. The Li⁺ ions, Li1 and Li2, are split over two M2 sites in general positions, with 60 (2) and 40 (2)% occupancy, respectively. Atom Li2 is disordered around a threefold inversion axis.

Online 19 October 2005

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