The conductivity and conductivity relaxation of (55−x)ZrF4–15BaF2–xYF3–30LiF glasses were studied, from 300K to just below the glass transition temperature, and at 10Hz to 2MHz. No large changes in the conductivity were observed upon replacing Zr4+ by Y3+ ions. The activation energy remained almost constant at up to 20mol%YF3, and increased at higher YF3 contents. The frequency-dependent conductivity was analyzed in terms of a modulus formalism. It was found that the distribution parameter for the conductivity relaxation times remained almost unchanged upon replacement with YF3, with an increase at 40mol%YF3. The distribution of relaxation times for the present glasses was much broader than that for YF3-free ZrF4-glasses. The glass decoupling index decreased, and the modulus relaxation rate increased, with increasing YF3 content; with an anomaly for the composition with 20mol%YF3.

Conductivity Relaxation in Zirconium Fluoride Glasses - Effect of Substitution of Zr4+ by Y3+ Ions. M.Sural, A.Ghosh: Solid State Ionics, 1999, 120[1-4], 27-32