New molybdate Li2Co2−x Nix (MoO4)3 (0 ⩽ x ⩽ 2) materials with a lyonsite structure: X-ray diffraction and Raman spectroscopy studies

► New series of Lyonsite Li2Co2−xNix(MoO4)3 (0 ⩽ x ⩽ 2) were prepared by soft-combustion method. ► Raman vibrational spectroscopy and their structures was discussed based on structural analysis. ► We studied the soft-combution reactions of the compositions Li2Co2−xNix(MoO4)3 (0 ⩽ x ⩽2). ► Structural characterization of a compounds via Rietveld Method. ► We analyzed the obtained lyonsite via Raman spectroscopy.