A New Nasicon-Type Phosphate Co0.5Ti2(PO4)3: I. Elaboration, Optical and Magnetic Properties

Abstract A new cobalt titanium monophosphate has been prepared by low temperature method. It crystallizes with the Nasicon-type structure. The indexation of the X-ray diffraction pattern is consistent with the R 3 or the R 32 space groups. The atomic arrangement is a three-dimensional framework formed by PO 4 tetrahedra sharing corners with TiO 6 octahedra. Co 2+ is located in half of the antiprism M (1) sites in a centered ( R 3 ) or off- centered ( R 32) position. The optical, EPR and magnetic data can account for a pure ionic Co–O bond.