Preparation and some properties of lithium vanadium bronzes

摘要

Lithium vanadium bronzes with composition formula Li_xV_2O_5 (0.04 <= x >= 0.92) have been prepared by solid-state reaction at 650 deg C in argon atmosphere.The products were characterized by X-ray powder diffraction and IR spcctroscopy.The results reveal that four phases namely alpha-,beta-,beta'-,and gamma-phasc are present in the studied range.The magnetic susceptibility for the investigated samples was measured using Gouy's method.The values of the effective magnetic moments as calculated from experimental data indicate the presence of V~(4+) ions in all samples.The electrical conductivity as a function of temperature and lithium content was measured in the temperature range from room temperature to 483 K.The electrical conductivity of the samples is found to be affected by lithium content.The values of the electrical conductivity increase with temperature for the investigated samples.The electronic and ionic conductions are discussed.