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http://dx.doi.org/10.4191/KCERS.2004.41.8.623

Phase Formation and Electrical Conductivity of Ba-Doped LaBaGaO4 Layered Perovskite  

Lee, Kyu-Hyoung (Department of Ceramic Engineering, Yonsei University)
Kim, Jong-Hwa (Department of Ceramic Engineering, Yonsei University)
Kim, Hye-Lim (Department of Ceramic Engineering, Yonsei University)
Kim, Shin (R&D Center, Sebit Co. Ltd.)
Lee, Hong-Lim (Department of Ceramic Engineering, Yonsei University)
Publication Information
Journal of the Korean Ceramic Society / v.41, no.8, 2004 , pp. 623-627 More about this Journal
Abstract
Phase formation and electrical conduction behavior of Ba-doped LaBaGa $O_4$ layered perovskite were studied. Orthorhombic single phase of $K_2$Ni $F_4$-type structure was observed for the composition range of 0$\leq$x$\leq$0.2 in the La$\_$1＋x/Ba$\_$1＋x/Ga $O_4$$\_$4-$\delta$/ system by X-ray analysis. In the dry atmosphere, La$\_$0.8/Ba$\_$1.2/Ga$\_$3.9/ exhibited mixed conduction of oxygen ion and hole (p-type) at high p( $O_2$). However, in water vapor containing atmosphere, it showed proton conduction due to the incorporation of water into oxygen vacancies. As the temperature decreased, the contribution of proton conductivity to the total conduction increased and proton conduction was dominant below 350$^{\circ}C$. The activation energy for proton conduction was calculated as 0.72 eV.
Keywords
Layered perovskite; $K_2$N$iF_4$-type structure; Oxygen ion conduction; Hole(p-type) conduction; Proton conduction;
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