LiNi1-xMxVO4的红外光谱和拉曼光谱研究

The vanadates of LiNi_1-xM_xVO₄(M=Fe,Co,Ni) containing VO₄ tetrahedrons were synthesized by soft chemical method through a new mild liquid route. The samples sintered at 450℃ for 3h and at 650℃ for 3h are named for LT-LiNiVO₄ and for MT-LiNi_1-xM_xVO₄ respectively. All of the products were measured by X-ray diffraction, IR and Raman spectra respectively. In comparison with IR spectra of V₂O₅ and NiO, the LT-LiNiVO₄ has a strong and broad IR absorption band of VO₄ tetrahedrons located at 600～850cm^-1 with three small splitting peaks corresponding to the asymmetry stretching vibrations of V-O bonds. The results of IR and Raman spectra for MT-LiNi_1-xM_xVO₄ show that the cations of Ni²⁺, Co²⁺, Fe²⁺ have the influences on the frequency shifts of the V-O vibrations.