SHEN Leyu ¹, DENG Hong ¹, ZHAO Hailei ^1,2

(1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Beijing Municipal Key Laboratory of New Energy Materials and Technologies, Beijing 100083, China)

Abstract: La_0.05Ba_0.95FeO_3-δ (LBFO)-Gd_0.2Ce_0.8O_2-δ (GDC) dual-phase oxygen permeation membranes were prepared by using the conventional ceramic route, while their structure and properties as a function of the phase ratio were studied. It is found that the LBFO and GDC phases have high chemical compatibility, without the presence of impurities after sintering at 1300 °C. The two phases can be effectively combined to form dense samples. With increasing content of GDC, the electrical conductivity and oxygen permeability are decreased, while the structure stability against reducing atmosphere is increased. When the content of GDC reaches 70wt.%, the dual-phase membrane delivers an oxygen permeability of 0.34 mL·min^-1·cm^-2 at 900 ℃.
Key words: oxygen permeable membrane; dual-phase material; iron-based perovskite; gadolinium doped ceria; structural stability