Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Humidity Effect on the Characteristics of the Proton Conductor Based on the BaR0.5+xTa0.5-xO3-δ (R=Rare Earth) System

BaR0.5+xTa0.5-xO3-δ (R=희토류 금속)계 Proton 전도체 특성에 미치는 수분의 영향

  • Choi, Soon-Mok (Korea Institute of Ceramic Engineering & Technology) ;
  • Seo, Won-Sun (Korea Institute of Ceramic Engineering & Technology) ;
  • Jeong, Seong-Min (Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Shin (Department of Ceramic Engineering, Kangnung National University) ;
  • Lee, Hong-Lim (Department of Ceramic Engineering, Yonsei University)
  • Published : 2008.05.31
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Abstract

$AB'_{0.5}B"_{0.5}O_3$ type complex perovskite structures which have been reported as proton conductors over $600^{\circ}C$ were studied. The $AB'_{0.5}B"_{0.5}O_3$ type complex perovskite structure is known to be more easily synthesized and has better stability than normal $ABO_3$ perovskite structure. And it is stable at about $800^{\circ}C$ in the $CO_2$ atmosphere, whereas the $BaCeO_3$ perovskite is easily decomposed into carbonate. In addition, this $AB'_{0.5}B"_{0.5}O_3$ type complex perovskite structure could simply produce oxygen vacancies within their structure not by introducing additional doping oxides but by just controling the molar ratio of $B'^{+3}$ and $B"^{+5}$ metal ions in the B site. Hence it is easy to design the structure which shows highly sensitive electrical conductivity to humidity. In this study, the single phase boundary of $BaR_{0.5+x}Ta_{0.5-x}O_{3-{\delta}}$(R = rare earth) complex perovskite structures and it's phase stability were investigated with changes in composition, x. And the humidity dependance of electrical conductivity at different $P_{H2O}$ conditions was investigated.

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References

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