The SXRPD pattern of the as-synthesized Na3V2(PO4)3 powder is shown in Figure . No impurity phases were detected based on the XRD analysis. As previously reported, at room temperature the crystal structure of Na3V2(PO4)3 cannot be indexed using a rhombohedral (R3c) cell, but a monoclinic distortion must be considered. This is illustrated by the splitting of the (116)rhombohedral reflection at dhkl ~ 2.8 Ǻ into (-511)monoclinic, (-422)monoclinic, and (-313)monoclinic, which are signatures of the monoclinic distortion (inset images of Figure ).