Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic
- Received Date: 2007-10-16
- Rev Recd Date: 2008-03-30
- BaCe0.8Pr0.2O3-α, AC impedance, Gas concentration cell, Electrochemical pumping of hy-drogen, Mixed conduction
Abstract: 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 in the temperature range of 500-900 ffiC. The results indicate that the material was of a single perovskite-type orthorhombic phase. From 500 ffiC to 900 ffiC, 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).
|Citation:||Mao-yuan Wang, Li-gan Qiu¤. Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic[J]. Chinese Journal of Chemical Physics , 2008, 21(3): 286-290. doi: 10.1088/1674-0068/21/03/286-290|