The existence of glasses which contained up to 60%LiF, within the quaternary system, permitted study of the evolution of the transport properties as a function of the LiF content. A minimum in the ionic conductivity, which was associated with a maximum in the activation energy, was detected when the Li/F atomic ratio was equal to about 0.07. At low Li concentrations, the conductivity increased regularly and the activation energy decreased simultaneously when the BaF2 concentration was increased. On the other hand, at high Li concentrations, the logarithms of the conductivity and of the activation energy were linear functions of the LiF content; and increased or decreased, respectively. A nuclear magnetic resonance study of 7Li and 19F showed that Li+ and F- ions were simultaneously mobile. At low Li concentrations, the transport properties resulted from the contributions of mobile Li+ and F- ions. At high Li concentrations, they depended upon the Li+ motion. Glasses with a high Li content had good electrical properties, and the conductivity of Zr0.2Ba0.1Li0.6Th0.1F6 was equal to 0.0002S/cm at 175C.

J.Senegas, J.M.Réau, H.Aomi, P.Hagenmuller, M.Poulain: Journal of Non-Crystalline Solids, 1986, 85[3], 315-34