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The new monodiphosphate Li 9 Cr 3 (P 2 O 7 ) 3 (PO 4 ) 2 was synthesized and analyzed by single-crystal X-ray diffraction, infrared and Raman spectroscopy. It crystallizes in the trigonal space group P 3 3c1 with the following unit cell constants: 9À layers, with CrO 6 octahedra sharing vertices and edges with mono-and diphosphate groups. Li cations, spread over three different sites, fill up the remaining cavities, stabilizing the framework via Li--O bonds, making up tetrahedral arrangements at Li(2) and Li (3), and a complex hexacoordination at Li(1). IR and Raman spectra of Li 9 Cr 3 (P 2 O 7 ) 3 (PO 4 ) 3 confirm the centrosymmetric structure and the bent configuration of the POP bridge of the diphosphate group.

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The crystal structure of the novel title diphosphate, Li(2)BaP(2)O(7), exists with a three-dimensional lattice composed of BaO(9) polyhedra linked to corner- and edge-sharing P(2)O(7) diphosphate groups, forming layers parallel to the (010) plane, the layers being linked by P[bond]O[bond]Ba bridges. Tunnels thus created between the layers are occupied by Li(+) cations, two of which lie on twofold axes.