| Mixed-conducting perovskite-type Sr_xBi_(1-X)FeO_(3-δ)oxygen-permeating membranes |
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| 引用本文： | 邵宗平,丛铀,熊国兴,盛世善,杨维慎.Mixed-conducting perovskite-type Sr_xBi_(1-X)FeO_(3-δ)oxygen-permeating membranes[J].中国科学B辑(英文版),2000,43(4). |
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| 作者姓名： | 邵宗平 丛铀 熊国兴 盛世善 杨维慎 |
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| 作者单位： | State key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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| 基金项目： | 中国科学院资助项目，National Advanced Materials Committee of China，科技部资助项目 |
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| 摘 要： | SrxBi1-xFeO3- (SBF) series mixed conductors were synthesized using Standard ceramic method. The properties of such materials were characterized by XRD, O2-TPD techniques. Ab-normal crystal phenomena were found and explained and correlated with the oxygen permeation results. By analysis of the critical radius (rc), the degree of openness of the lattice (Fv) and the average metal-oxygen bonding energy of the perovskite lattice (ABE), it was proposed that the oxygen permeation flux is determined mainly by the oxygen diffusion rate in bulk when 1-x≤0.5, and by the concentration of oxygen vacancy when 1-x≥ 0.5. The stability of Sr0.5Bi0.5FeO3- was also investigated, and the high stability of it was attributed to the stable BO6 octahedra.
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| 关 键 词： | oxygen membrane Sr_xBi_(1-x)FeO_(3-δ) crystal structure phase stability permeation flux. |
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