STRUCTURE OF NA3FE(PO4)(2) FROM POWDER X-RAY DATA

Na3Fe(PO4)(2) cristallizes in the monoclinic system with the space gro up C2/c and the parameters a = 9.0637(3) Angstrom, b = 5.0281(2) Angst rom c = 13.8581(3) Angstrom, beta = 91.434(2)degrees and Z = 4. The st ructure was determined from powder X-ray diffraction data collected on a Philips PW 1710 diffractometer using CuK alpha(1) alpha(2) radiatio n. This structure is built up from layers of FeO6 octahedra and PO4 te trahedra sharing corners. These [Fe(PO4)(2)(3-)](n) layers are very si milar to the [Fe(MoO4)(2)(2-)](n) layers in the NaFe(MoO4)(2) compound .