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New trigonal Na3Fe2(PO4)3 phase: Synthesis and crystal structure

New crystals of sodium iron orthophosphate Na 3 Fe 2 (PO 4 ) 3 (compound I) were synthesized hydrothermally. The X-ray crystal structure was determined without knowing the chemical formula (a = 13.39(1) A, c = 17.91(2) A, space group R3 c, R h k l = 0.0404, R w h k l = 0.0482, S = 1.01). Compound I is the full formula analogue of the NASICON cation conductor. The crystal structures of these analogues are different but have several common fragments. Crystal-chemical analysis of the framework and suggested conductive channels shows that the crystals of compound I are of a new structural type and that sodium ion mobility in them is allowed to a lesser extent than in their NASICON-like analogues.