Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Microstructures and Proton Conductivities of BaZrO3 Modified by BaCeO3

BaCeO3가 첨가된 BaZrO3의 미세구조 및 수소이온 전도도

  • 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)
  • 박종성 (한국과학기술연구원 에너지재료연구단) ;
  • 이성명 (한국과학기술연구원 에너지재료연구단) ;
  • 김동완 (한국과학기술연구원 나노재료과학본부 나노재료연구센터) ;
  • 이종호 (한국과학기술연구원 에너지재료연구단) ;
  • 이해원 (한국과학기술연구원 에너지재료연구단) ;
  • 최헌진 (연세대학교 세라믹공학과) ;
  • 김병국 (한국과학기술연구원 에너지재료연구단)
  • Published : 2008.04.30
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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

References

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