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 the R (3) over bar or the R32 space groups. The atomic arrangement is a three-dimensional framework formed by PO, tetrahedra sharing corners with TiO6 octahedra, Co2+ is located in half of the antiprism M(1) sites in a centered (R (3) over bar) or off-centered (R32) position, The optical, EPR and magnetic data can account for a pure ionic Co-O bond. (C) 1999 Academic Press.