SrFe0.6Cu0.3Ti0.1O3-δ混合导体透氧材料的稳定性

利用柠檬酸络合法制备了SrFe(Cu,Ti)O_3-δ混合导体透氧材料。 采用XRD、O₂-TPD、H₂-TPR、SEM等测试技术考察了材料的稳定性。 结果表明，SrFe_0.7Cu_0.3O_3-δ在低氧压下会发生相分解，产生SrCuO₂杂相，而掺杂Ti后的SrFe_0.6Cu_0.3Ti_0.1O_3-δ在低氧压下保持单一的钙钛矿结构。 H₂-TPR和O₂-TPD的测试表明，Ti⁴⁺的掺杂提高了材料的氧脱附起始温度和其它金属离子的还原温度。 SrFe_0.6Cu_0.3Ti_0.1O_3-δ膜在透氧过程中，会有Cu²⁺和Sr²⁺从钙钛矿结构中析出，在原晶粒边界形成新的小晶粒，但这种轻微的组分偏析没有影响到材料的透氧量，此透氧膜在66 h的操作过程中显示了良好的稳定性。

Stability of SrFe0.6Cu0.3Ti0.1O3-δ Mixed Conducting Membrane Material

SrFe(Cu,Ti)OO_3-δ mixed conducting membrane materials were synthesized by citric acid complexing method. The stabilities of the materials were studied by means of XRD, O₂-TPD, H₂-TPR and SEM. It was found that phase decomposition occurred in SrFe_0.7Cu_0.3O_3-δ under a low oxygen partial pressure and a minor phase SrCuO₂ was formed. The addition of Ti⁴⁺ greatly enhanced the structure stability of the material, and SrFe_0.6Cu_0.3Ti_0.1O_3-δ maintained single phased perovskite structure. H₂-TPR and O₂-TPD results showed that the addition of Ti⁴⁺ increased the initial oxygen desorption temperature of the material, and the reduction temperature of the other metal ions. Slight phase decomposition was found on the He side surface of SrFe_0.6Cu_0.3Ti_0.1O_3-δ membrane after oxygen permeating test and fresh small grains congregated at the boundary of the initial grains. SrFe_0.6Cu_0.3Ti_0.1O_3-δ  exhibits a high stability during 66 h oxygen permeating process.