The equilibrium proton concentration in SrCe0.95Yb0.05O3 was determined by means of thermogravimetric analysis. From the dissolution behavior of water vapor, the formation of protons could be estimated via the relationship:

H2O + Oo•• ↔ 2H• + Oox

The proton mobility (figure 8) and activation energy were then deduced from the proton concentrations.

T.Yajima, H.Iwahara: Solid State Ionics, 1992, 50[3-4], 281-6

Figure 8

Mobility of H in SrCe0.95Yb0.05O3