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inorganic compounds
Sodium yttrium diphosphate crystallizes in the noncentrosymmetric space group P21. The structure consists of corner-sharing YO6 octahedra and P2O7 groups forming an alternate stacking of octahedral layers and phosphate layers. The framework delimits intersecting tunnels where the Na+ cations are located. The P2O7 groups show a nearly staggered configuration intermediate between that in KYP2O7 [Hamady, Zid & Jouini (1994), J. Solid State Chem. 113, 120–124] and that in α-NaTiP2O7 [Leclaire, Benmoussa, Borel, Grandin & Raveau (1988), J. Solid State Chem. 77, 299–305].
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