Ag+-ion conducting composites based on silver-borate glasses and α-Al2O3 ceramic matrices were synthesized by a high-pressure method (p = 7.7GPa and t = 100–200C). They exhibited improved mechanical properties (e.g. reduced brittleness). Their electrical conductivity, as well as the conductivity of the corresponding glasses was measured in the wide temperature range from −190 to 30C. It was found out that for all measured samples (composites and glasses) the temperature dependence of the conductivity follows the Arrhenius formula with a single activation energy close to 0.30eV in the whole temperature range. The conductivity of the composites was lower than that of the corresponding glasses by a factor of 5–10, due to percolation phenomena. It was found out that by an appropriate thermal treatment, the conductivity of the composites could be raised to about 2 x·10−3S/cm at room temperature.

Low-Temperature Conductivity of Composites Based on Ag+-Ion Conducting Glasses and α-Al2O3 Matrix, Prepared via a High-Pressure Route. M.Foltyn, M.Wasiucionek, J.E.Garbarczyk, J.L.Nowinski, S.Gierlotka, B.Palosz: Solid State Ionics, 2008, 179[1-6], 38-41

Figure 3

Diffusivity of O in Al2O3

(Y-doped material)