A study was made of ion dynamics in glassy conductors of the form xLi2S-(1-x)B2S3, where x was equal to 0.65 or 0.70, by means of nuclear magnetic resonance spin lattice relaxation measurements of mobile 7Li and immobile 11B ions. Two Gaussian distributions of activation energies were used to fit the 7Li nuclear magnetic resonance spin lattice relaxation data. Each Gaussian distribution was correlated with separate 11B signals from BS3 and BS4 groups. The long-range diffusion of Li ions among BS3 groups, plus localized ionic hopping motions around BS4 groups, was proposed as a microscopic model for the ion dynamics in these glasses.

K.H.Kim, D.R.Torgeson, F.Borsa, S.W.Martin: Solid State Ionics, 1996, 90[1-4], 29-38