Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Phase Formation and Electrical Conductivity of Ba-Doped LaBaGaO4 Layered Perovskite

Ba 첨가 LaBaGaO4 층상 Perovskite의 생성상과 전기전도도

  • 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)
  • 이규형 (연세대학교 세라믹공학과) ;
  • 김종화 (연세대학교 세라믹공학과) ;
  • 김혜림 (연세대학교 세라믹공학과) ;
  • 김신 ((주)새빛 생산기술연구소) ;
  • 이홍림 (연세대학교 세라믹공학과)
  • Published : 2004.08.01
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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.

Ba가 첨가된 LaBaGa $O_4$ 층상 perovskite의 생성상과 전도거동에 대해 고찰하였다. LaBaGa $O_4$의 La-site에 20at% 이하의 $Ba^{2＋}$ 이온을 첨가한 조성은 $K_2$Ni $F_4$구조 사방정 단일상을 형성하였다. 건조분위기에서 L $a_{0.8}$B $a_{1.2}$G $a_{3.9}$는 높은 산소분압영역에서 산소이온전도와 hole(p-type)전도의 혼합전도를 나타내었다. 수증기분위기에서는 수증기가 산소빈자리로 유입되어 proton전도가 발생되었으며, 온도가 낮아질수록 총전도에 대한 proton 전도도의 기여가 증가하여 35$0^{\circ}C$ 이하의 온도에서는 proton 전도가 지배적인 전도를 나타내었다. Proton 전도에 대한 활성화 에너지는 0.72 eV였다.

Keywords

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