BaxCe0.8Er0.2O3-δ (x = 0.98 to 1.03) solid electrolytes were synthesized by high temperature solid-state reaction. X-ray diffraction patterns showed that the specimens were a single perovskite-type orthorhombic phase. The conduction properties of the specimens were studied electrochemically at 600 to 1000C. The influence of non-stoichiometry, in specimens with x not equal to unity, upon conduction properties was investigated and was compared with that in the specimen with x = 1. These 3 specimens exhibited a good protonic conduction under wet H, a mixed conduction of oxide-ion and electronic hole under dry higher O partial pressure, and a mixed conduction of proton, oxide-ion and electronic hole under wet higher O partial pressure. Both of the protonic and oxide-ionic conductivities increased with increasing Ba content in the specimens under wet H and dry air, respectively.

Ionic Conduction in BaxCe0.8Er0.2O3-δ. L.Qiu, G.Ma, D.Wen: Solid State Ionics, 2004, 166[1-2], 69-75