A series of glasses of the form, xLi2S + (1-x)GeS2, was studied, where x was equal to 0.35, 0.45 or 0.55. The 7Li nuclear spin-lattice relaxation was measured at 4, 12.1 and 22MHz, and the conductivity was measured from 1Hz to 10MHz and from 100 to 500K. The data were compared with a model, for ionic motion and ionic conductivity in Li+ glassy fast-ion conductors, which was based upon ionic hopping motion with a distribution of activation energies. It was found that the distribution of activation energies, deduced from nuclear magnetic resonance data, and the percolation threshold in the barrier distribution, as deduced from conductivity data, were a function of the glass composition.

K.H.Kim, D.R.Torgeson, F.Borsa, J.Cho, S.W.Martin, I.Svare: Solid State Ionics, 1996, 91[1-2], 7-19