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用湿化学法合成了Ba0 .5Sr0 .5CoxFe1 xO3 δ系列混合导体透氧膜材料 ,并用XRD ,O2 TPD ,H2 TPR和透氧测定等手段考察了铁离子掺杂浓度对导体膜相结构及其稳定性、氧脱附性能和透氧能力等的影响 .在氧浓度为 2 .13× 10 4 ～ 0 .1Pa的范围内 ,x =0 .2～ 0 .8时材料保持为立方钙钛矿结构 .铁含量的增加有利于材料钙钛矿结构在低温的稳定化 ,并提高了材料的热化学稳定性 .然而 ,导体膜的透氧量却随着铁含量的增加而减小 .这可能是由于导体膜表面的氧交换动力学过程在透氧速率控制步骤中的分量随铁含量的增加而变大之故
The oxygen permeation membrane of Ba0.5Sr0.5CoxFe1xO3 δ series mixed conductor was synthesized by wet chemical method. The effects of doping concentration of iron ion on the phase structure and stability of conductor membrane were investigated by XRD, O2 TPD, H2 TPR and oxygen permeation measurements. Sex, oxygen desorption performance and oxygen permeability, etc. In the range of oxygen concentration of 2.13 × 10 4 ~0 .1 Pa, x = 0.2 ~ 0.8 when the material remains cubic perovskite structure The increase of iron content is conducive to the stabilization of the material perovskite structure at low temperature and the thermal chemical stability of the material.However, the oxygen permeability of the conductor film decreases with the increase of iron content.This may be Since the oxygen exchange kinetics on the surface of the conductor film becomes larger as the iron content increases in the oxygen permeation rate control step