Lithium ion transport in Li2SO4-Li2O-B2O3 glasses

Electrical conductivity and dielectric relaxation studies with a wide range of compositions of lithium ion conducting glasses belonging to the ternary glass system Li2SO4-Li2O-B2-O3- have been carried out over the temperature range 150-450 K and between 10 - 10(7) Hz. DC conductivities exhibit two d ifferent activation regions. This seems to suggest the presence of a cluste r tissue texture in these glasses with weakly ordered clusters of Li2SO4 an d lithium berates being held together by a truly amorphous tissue of the sa me average composition as clusters. AC conductivity behaviour of these glas ses has been analysed using both power law and stretched exponential relaxa tion functions. The variation of the power law exponent s and the stretched exponent beta with temperature seems to be consistent with the presence of a cluster tissue texture in these glasses.