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研究与合成了系列新型的钙钛矿型B位铋掺杂混合导体透氧膜材料,对其结构与透氧性能进行了测定.发现BaBi_(0.2)Co_yFe_(0.8-y)O_(3-δ)(y≤0.4)及BaBi_xCo_(0.2)Fe_(0.8-x)O_(3-δ)(x=0.1~0.5 )都可以形成立方晶相的钙钛矿型复合氧化物.透氧测定表明此系列材料具有非常高的氧渗透能力.BaBi_(0.2)Co_(0.35)Fe_(0.45)O_(3-δ)导体膜,在膜片一端为空气氛另一端为氦气氛情况下,900℃时透氧量高达0.77 × 10~(-6) mol/(cm~2·s)以上,远远高于相同条件下其他的含铋透氧膜材料.并发现透氧量随着钴含量的增加而增加,而与铋含量无简单的关系.O_(2)-TPD测定表明,材料具有优良的氧吸附脱附可逆性.长时间透氧测定表明,BaBi_(0.2)Co_(0.35)Fe_(0.45)O_(3-δ)BaBi_(0.3)Co_(0.2)Fe_(0.5)O_(3-δ)导体膜在875℃下都具有较稳定的氧渗透行为.
A series of novel perovskite-type B-doped bismuth-doped mixed-conductor oxygen-permeable membrane materials were studied and synthesized. Their structures and oxygen permeability were measured. BaBi_ (0.2) Co_yFe_ (0.8-y) O_ (3-δ) (y≤0.4) and BaBi_xCo_ (0.2) Fe_ (0.8-x) O_ (3-δ) x = 0.1 to 0.5) can form a cubic crystal perovskite-type composite oxide. Oxygen measurements show that this series of materials has a very high oxygen permeability. BaBi_ (0.2) Co_ (0.35) Fe_ (0.45) O_ (3-δ) Conductor film with oxygen concentration at 900 ℃ with an air atmosphere at one end of the film and helium atmosphere at the other end .77 × 10 ~ (-6) mol / (cm ~ 2 · s), which is much higher than that of other bismuth-containing oxygen-permeable membrane materials under the same conditions. And found that the amount of oxygen increases with the increase of cobalt content, but with no simple relationship between the content of bismuth. O_ (2) -TPD measurement showed that the material has excellent oxygen adsorption and desorption reversibility. The long time oxygen permeability measurements showed that the BaBi_ (0.2) Co_ (0.35) Fe_ (0.45) O_ (3-δ) BaBi_ (0.3) Co_ (0.2) Fe_ (0.5) O_ (3-δ) conductor film has a more stable oxygen permeation behavior at 875 ° C.