Electrical conductivity and dielectric relaxation studies were made of a wide range of Li-ion conducting glasses at 150 to 450K and 10Hz to 10MHz. The direct-current conductivities exhibited 2 different activation regions. This suggested the existence of a cluster texture in the glasses, with weakly ordered clusters of Li2SO4 and lithium borates which were held together by an amorphous phase having the same average composition as the clusters. The alternating-current conductivity behaviour of the glasses was analyzed by using both power-law and stretched-exponential relaxation functions. The variations of the power-law exponents and the stretched exponents, with temperature, seemed to be consistent with the presence of a cluster texture in the glasses.

Lithium Ion Transport in Li2SO4-Li2O-B2O3 Glasses. M.Ganguli, M.B.Harish, K.J.Rao: Physics and Chemistry of Glasses, 1999, 40[6], 297-304