The alternating- and direct-current conductivities of the fast-ion conducting glasses, xNa2S - (1-x)B2S3, were studied for x-values ranging from 0.001 to 0.1, and the results were analyzed by using the Almond-West formula. The hopping frequency for free charge carriers, the direct-current conductivity, and their respective activation energies, were determined. The concentrations of free charge carriers which were deduced from the conductivities and mobilities were in good agreement with the overall contents of Na cations in the glasses. It was suggested that this supported the concept of a strong, rather than weak, electrolyte model for these fast-ion conducting glasses.

E.F.Hairetdinov, N.F.Uvarov, H.K.Patel, S.W.Martin: Physical Review B, 1994, 50[18], 13259-66