The layered monodiphosphate Li9Ga3(P2O7) (3)(PO4)(2) refined from X-ray powder data

Nona­lithium trigallium(III) tris­[pyro­phosphate(V)] diphos­phate(V), Li9Ga3(P2O7)3(PO4)2, has been synthesized by a hydro­thermal method and its crystal structure solved from X-ray powder diffraction data using Rietveld analysis. The structure is based on separate layers parallel to (001), consisting of GaO6 octa­hedra that share corners with PO4 tetra­hedra and P2O7 groups. The lithium ions are located in the inter­stitial space.