Layered compounds derived from vanadyl phosphate dihydrate

The layered crystalline solids stable in air with general formula [M(H2O)]x(VO)1−xPO4.2H2O (M=Al, Cr, Fe, Ga; x=0.15–0.20) were prepared by reaction of solid V2O5 with boiling aqueous solution of phosphoric acid and corresponding metal salt. The elementary cell of these compounds are tetragonal (space symmetry group either P4n or P4nmm). The lattice parameters and densities were determined. The results of TG, DTA and magnetic susceptibility measurements are given.