Composites which contained 1 to 15m/o of SiO2 as a dispersed phase were prepared, and the conductivities were measured at 400 to 700C by using direct-current four-probe and impedance spectroscopic methods. The conductivities of samples with 1 to 10m/o of SiO2 were much higher than those of pure CaF2, and depended upon the preparation method. The maximum conductivity was found at 5.0m/o of SiO2. The composites appeared to be purely ionic conductors.

Conductivity of Composite Calcium Fluoride–Silica Solid Electrolytes. G.Róg, M.M.Bućko, A.Kielski, A.Kozłowska-Róg: Ceramics International, 1999, 25[7], 623-30