Characterization, electrical conduction and stability of Yb-doped barium cerate prepared by sol-gel method

• Published in: Ionics
• Main Author: Osman N.; Talib I.A.; Hamid H.A.; Jani A.M.
• Format: Article
• Language: English
• Published: 2008
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-51149108556&doi=10.1007%2fs11581-007-0184-x&partnerID=40&md5=1b5bea3a6907aebb35b7ce27598e561e

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.