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

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 theR or theR32 space groups. The atomic arrangement is a three-dimensional framework formed by PO4tetrahedra sharing corners with TiO6octahedra. Co2+is located in half of the antiprismM(1) sites in a centered (R ) or off- centered (R32) position. The optical, EPR and magnetic data can account for a pure ionic Co-O bond.