Lithium ion transport in Li₂SO₄-Li₂O-B₂O₃ glasses

Abstract

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-B₂O₃ have been carried out over the temperature range 150-450 K and between 10-107 Hz. DC conductivities exhibit two different activation regions. This seems to suggest the presence of a cluster tissue texture in these glasses with weakly ordered clusters of Li₂SO₄ and lithium borates being held together by a truly amorphous tissue of the same average composition as clusters. AC conductivity behaviour of these glasses has been analysed using both power law and stretched exponential relaxation functions. The variation of the power law exponent s and the stretched exponent β with temperature seems to be consistent with the presence of a cluster tissue texture in these glasses.