Microstructures and proton conductivities of BaZrO3 modified by BaCeO3

Jong Sung Park, Sung Myung Lee, Dong Wan Kim, Jong Ho Lee, Hae Won Lee, Heon-Jin Choi, Byung Kook Kim

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Abstract

The dense sintered bodies with >95% theoretical densities were successfully obtained from the BaZrO3, BaCeO3, Ba(Zr 0.7Ce0.3)O3 solid solution, and core-shell structured 0.7BaZrO3-0.3BaCeO3 composite powders prepared by sol-gel methods. The activation energy of Ba(Zr0.7Ce 0.3)O3 solid solution calculated from the Arrhenius plot of the proton conductivities was similar to that of BaZrO3. The activation energy of core-shell structured 0.7BaZrO3-0.3BaCeO 3 composite, however, was much lower than that of BaZrO3 or Ba(Zr0.7Ce0.3)O3 solid solution, and was very similar to that BaCeO3. These results could be assigned to the Ce-rich grain boundary which was clearly observed by EDX in core-shell structured 0.7BaZrO3-0.3BaCeO3 composite.

Original languageEnglish
Pages (from-to)226-231
Number of pages6
JournalJournal of the Korean Ceramic Society
Volume45
Issue number4
DOIs
Publication statusPublished - 2008 Jan 1

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

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