Abstract
A new NASICON-type chromium(III) phosphate, K0.16Na0.34Li2.5Cr2(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.
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