Abstract
A new member of the A 2MP 2O 7 diphosphate family, Li 2MnP 2O 7, has been synthesized by solid-state reaction and characterized using single-crystal X-ray diffraction. Li 2MnP 2O 7 crystallizes in the monoclinic space group P2 1/ a (#14) with the cell parameters a=9.9158(6) Å, b=9.8289(6) Å, c=11.1800(7) Å, β=102.466(5)°, Z=8 and V=1063.9(1) Å 3. Its mixed framework exhibits an original Mn 2O 9 unit, built up of one MnO 5 trigonal bipyramid sharing one edge with one MnO 6 octahedron. These Mn 2O 9 units are sharing corners with P 2O 7 diphosphate groups, forming the undulating [Mn 4P 8O 32] ∞ layers. The [MnP 2O 7] ∞ 3D framework, resulting from the interconnection of the undulating [Mn 4P 8O 32] ∞ layers, exhibits different kinds of intersecting tunnels containing the Li cations.
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