Abstract
A new phosphate, Na 2.5Y 0.5Mg 7(PO 4) 6 was synthesized as single crystals by the flux method and as a powdered sample by the Pechini technique, and investigated by single crystal X-ray diffraction, charge distribution (CD) and 31P NMR spectroscopy. This compound crystallized in the rhombohedral space group R ▪ and its equivalent hexagonal cell had the following parameters: a=1.4976(6) nm, c= 4.2599(7) nm, Z= 18. The structure consisted of MgO 5, MgO 6, YO 6, (Na,Y)O 8 and NaO x ( x=6, 7 and 9) polyhedra which were linked either directly through common corners, edges and faces and by means of the PO 4 tetrahedra via common corners and edges, giving rise to a complex three-dimensional framework, similar to that of the fillowite-like structure. The cation distribution was confirmed by charge distribution (CD) calculations and 31P NMR spectroscopy study.
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