The BaCe0.8Pr0.2O3-α ceramic was synthesized by high temperature solid-state

reaction. The structural characteristics and the phase purity of the crystal were

determined using powder X-ray diffraction analysis. By using the methods of AC

impedance spectroscopy, gas concentration cell and electrochemical pumping of

hydrogen, the conductivity and ionic transport number of BaCe0.8Pr0.2O3-α were

measured, and the electrical conduction behavior of the material was investigated

in different gases at 500 to 900C. The results indicate that the material was of a

single perovskite-type orthorhombic phase. From 500 to 900 C, electronic-hole

conduction was dominant in dry and wet oxygen, air or nitrogen, and the total

conductivity of the material increased slightly with increasing oxygen partial

pressure in the oxygen partial pressure range studied. Ionic conduction was

dominant in wet hydrogen, and the total conductivity was about one or two orders

of magnitude higher than that in hydrogen-free atmosphere (oxygen, air or

nitrogen).

Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic. M.Y.Wang, L.G.Qiu: Chinese

Journal of Chemical Physics, 2008, 21[3], 286-90