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J. Korean Ceram. Soc. > Volume 45(5); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(5): 290.
doi: https://doi.org/10.4191/kcers.2008.45.5.290
BaR0.5+xTa0.5-xO3-δ (R=희토류 금속)계 Proton 전도체 특성에 미치는 수분의 영향
최순목, 서원선, 정성민, 김신1, 이홍림2
요업(세라믹)기술원
1강릉대학교 세라믹공학과
2연세대학교 세라믹공학과
Humidity Effect on the Characteristics of the Proton Conductor Based on the BaR0.5+xTa0.5-xO3-δ (R=Rare Earth) System
Soon-Mok Choi, Won-Sun Seo, Seong-Min Jeong, Shin Kim1, Hong-Lim Lee2
Korea Institute of Ceramic Engineering & Technology
1Department of Ceramic Engineering, Kangnung National University
2Department of Ceramic Engineering, Yonsei University
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.
Key words: Complex perovskite, Proton conductor, Oxygen vacancy, Electrical conductivity
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