IONIC CONDUCTIVITY BEHAVIOR OF LITHIUM SULFATE DOPED TRANSITION METAL OXIDE GLASSES

Novel lithium ion containing transition metal oxide based phosphate glasses have been synthesized in the composition xLi₂SO₄-30Li₂O-(70-x) [0.70P₂O₅:0.30V₂O₅] (x=5, 10, 15, 20 and 25 mol %). Glasses are synthesized using melt quenching technique and their amorphous nature is tested by XRD studies. Impedance measurements are carried out in the frequency range of 100Hz-11MHz over and a temperature range of 313 K to 463 K. Impedance and modulus formalism is employed to study ion transport behavior of as-prepared glasses. Activation energies (E_dc) and d.c conductivities (σ_dc) exhibit composition dependent trends. Impedance and modulus formalism reveals dominance of ion conductivity and relaxation mechanism of Li+ ions in the investigated glasses are of short range and of non-Debyetype.