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http://dx.doi.org/10.4191/KCERS.2008.45.4.226

Microstructures and Proton Conductivities of BaZrO3 Modified by BaCeO3  

Park, Jong-Sung (Center for Energy Materials Research, Korea Institute of Science and Technology)
Lee, Sung-Myung (Center for Energy Materials Research, Korea Institute of Science and Technology)
Kim, Dong-Wan (Nano-material Research Center, Nano Science Research Division, Korea Institute of Science and Technology)
Lee, Jong-Ho (Center for Energy Materials Research, Korea Institute of Science and Technology)
Lee, Hae-Won (Center for Energy Materials Research, Korea Institute of Science and Technology)
Choi, Heon-Jin (Department of Ceramic Engineering, Yonsei University)
Kim, Byung-Kook (Center for Energy Materials Research, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.45, no.4, 2008 , pp. 226-231 More about this Journal
Abstract
The dense sintered bodies with >95% theoretical densities were successfully obtained from the $BaZrO_3,\;BaCeO_3,\;Ba(Zr_{0.7}Ce_{0.3})O_3$ solid solution, and core-shell structured $0.7BaZrO_3-0.3BaCeO_3$ composite powders prepared by sol-gel methods. The activation energy of $Ba(Zr_{0.7}Ce_{0.3})O_3$ solid solution calculated from the Arrhenius plot of the proton conductivities was similar to that of $BaZrO_3$. The activation energy of core-shell structured $0.7BaZrO_3-0.3BaCeO_3$ composite, however, was much lower than that of $BaZrO_3$ or $Ba(Zr_{0.7}Ce_{0.3})O_3$ solid solution, and was very similar to that $BaCeO_3$. These results could be assigned to the Ce-rich grain boundary which was clearly observed by EDX in core-shell structured $0.7BaZrO_3-0.3BaCeO_3$ composite.
Keywords
Proton conducting oxide; Core-Shell$BaZrO_3$$BaCeO_3$;
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