Abstract: A series of Al₂O₃-doped SrCo_0.8Fe_0.2O_3-δ(SCFA) mixed conducting oxides were synthesized by the solid-state reaction method.XRD and TG were used to characterize the crystal structure and oxygen nonstoichiometry of the SCFA.The oxygen permeation processes and stability of the SCFA membrane were investigated by high temperature oxygen permeation measurement and thermal decomposition of carbon dioxide (TDCD) coupled with partial oxidation of methane (POM) to syngas.When the doping amount of Al₂O₃ was lower than 3%(mass), Al³⁺ cations were found to diffuse into the interstitial sites of SrCo_0.8Fe_0.2O_3-δ(SCF) lattice, which greatly enhanced the structure stability of the materials synthesized.Both the bulk diffusion and surface exchange processes affected the oxygen permeation in SCFA3 ［the doping amount of Al₂O₃ was 3%(mass)］, and the characteristic thickness (L_c) of SCFA3 was about 131.5 μm.TDCD-POM reaction (1173 K) indicated that the stability of the Al2O3-doped SrCo_0.8Fe_0.2O_3-δ was better than that of the ZrO2-doped SrCo_0.4Fe_0.6O_3-δ(SCFZ).

摘要： 采用固相反应法制备了Al₂O₃掺杂的SrCo_0.8Fe_0.2O_3-δ(SCFA)新型钙钛矿型混合导体材料.对材料进行的结构分析表明，Al³⁺离子进入SrCo_0.8Fe_0.2O_3-δ(SCF)晶胞间隙位，降低了材料的氧非化学计量系数，并有效提高了材料的结构稳定性;对不同厚度的SCFA3［Al₂O₃掺杂量为3%（质量）］片式膜的氧渗透性能测定结果表明，SCFA3膜的氧渗透过程受到表面交换过程和体扩散过程的共同影响，其临界厚度约为131.5 μm;二氧化碳热分解(TDCD)耦合甲烷部分氧化(POM)膜反应过程（反应温度1173 K）表明，Al₂O₃掺杂的SrCo_0.8Fe_0.2O_3-δ较SrCo_0.4Fe_0.2O_3-δ (SCFZ) 具有更加优异的稳定性.