The conductivity and conductivity relaxation of (55-x)ZrF4-15BaF2-xYF3-30LiF glasses were studied at temperatures ranging from 300K to just below the glass transition temperature, at frequencies ranging from 10Hz to 2MHz. No large changes in conductivity were observed upon replacing Zr4+ with Y3+ ions. The activation energy remained almost constant up to 20mol%YF3, and increased at higher YF3 contents. The frequency-dependent conductivity was analyzed in terms of a modulus formalism. The distribution parameter for the conductivity relaxation times remained almost unchanged upon substituting YF3, with an increase for 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 at 20mol%YF3.

M.Sural, A.Ghosh: Solid State Ionics, 1999, 120[1-4], 27-32