Mixed-conducting perovskite-type SrxBi1-xFeO3-δoxygen-permeating membranes
SrxBi1-xFeO3-δ (SBF) series mixed conductors were synthesized using standard ceramic method. The properties of such materials were characterized by XRD, O2-TPD techniques. Abnormal 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-δ was also investigated, and the high stability of it was attributed to the stable BO6 octahedra.
作 者： SHAO Zongping CONG You XIONG Guoxing SHENG Shishan YANG Weishen 作者单位： State key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China 刊 名： 中国科学B辑（英文版） EI SCI 英文刊名： SCIENCE IN CHINA (SERIES B) 年，卷(期)： 2000 43(4) 分类号： O6 关键词： oxygen membrane SrxBi1-xFeO3-d crystal structure phase stability permeation flux