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http://dx.doi.org/10.4191/KCERS.2008.45.5.290

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

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)
Publication Information
Journal of the Korean Ceramic Society / v.45, no.5, 2008 , pp. 290-296 More about this Journal
Abstract
$AB type complex perovskite structures which have been reported as proton conductors over $600^{\circ}C$ were studied. The $AB 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 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 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.
Keywords
Complex perovskite; Proton conductor; Oxygen vacancy; Electrical conductivity;
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Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 1
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