Abstract
BaCeO3 doped with trivalent ions have high proton conductivity but poor chemical stability against CO2. Al-doped BaCeO3 (Ba(Ce1−xAlx)O3−δ) was fabricated via conventional solid oxide reactions, and their chemical stabilities against CO2 and electrical conductivities were compared with those of Y-doped BaCeO3, which is a promising proton conducting oxide. The chemical stabilities against CO2 were enhanced by doping with Al; however, the electrical conductivities decreased. However, an abnormal increase in the electrical conductivity at temperatures ranging from 400 to 470 °C occurred when the Al content was above 15 mol%. In order to explain such an abnormal increase in electrical conductivity, thermogravimetric and X-ray diffraction analyses were performed at high temperatures, and the abnormal increase in electrical conductivity was correlated with water incorporation reactions and a transformation of the crystal structures with changes in temperature.
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