Fluoride-based composites which contained 1 to 15mol% of SiO2 as a dispersed phase were prepared. The conductivity was measured, at temperatures of 400 to 700C, by using direct-current 4-probe and impedance spectroscopic methods. The conductivities of samples which contained 1 to 10mol% of silica were significantly higher than those of the pure fluoride, and depended upon the preparation method. The highest conductivity was observed at 5mol%SiO2. The composites appeared to be purely ionic conductors.

G.Rog, M.M.Bucko, A.Kielski, A.Kozlowska-Rog: Ceramics International, 1999, 25[7], 623-30