| Summary: | Ceramics powder of BaCe0.95Yb0.05O2.975 was successfully prepared by sol-gel method. Thermogravimetric analysis showed that the decomposition of the dried powder was completed at 1,000 °C. Three strongly exothermic peaks observed in differential thermogravimetric signal indicated three major stages of weight loss in the sample. The high crystallinity of sample with orthorhombic structure was confirmed by X-ray diffraction. The loose particles size obtained from scanning electron microscope was in the range of 65-100 nm, which is almost in the same range as that observed in particle size distribution. The sample showed a dc conductivity of ~1.3∈×∈10-4 S cm-1 at 650 °C and the activation energy, E a, was found to be 1.4 eV. Result of chemical stability test showed that the compound was unstable in atmosphere containing pure carbon dioxide. © 2007 Springer-Verlag.
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