The direct-current conductivity and conductivity relaxation of ZrF4–BaF2–YF3–LiF glasses were studied from 300K to just below the glass transition temperature, and at 10Hz to 2MHz. It was found that the conductivity went through a minimum, and the activation energy a maximum, at about 20mol%LiF. The glass decoupling index also exhibited a minimum at the same composition, and was associated with the minimum in conductivity. A small variation of the relaxation parameter at low LiF contents was consistent with the weak-coupling model. The relaxation parameter exhibited a minimum at a composition which was different to that of the conductivity minimum; due to the competitive influence of Ba2+ and Li+ cations upon ionic mobility.

Conductivity and Relaxation in ZrF4–BaF2–YF3–LiF Glasses - Effect of Substitution of BaF2 by LiF. M.Sural, A.Ghosh: Solid State Ionics, 1999, 126[3-4], 315-21