Structural stability and oxygen permeability of cerium lightly doped BaFeO3−δ ceramic membranes |
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| Institution: | 1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China;2. Graduate School of the Chinese Academy of Sciences, China;1. Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou, 221116, PR China;2. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, 221116, PR China;3. Department of Physics, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan;4. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, PR China;1. Semiconductor R&D Center, Samsung Electronics, 1-1 Samsungjeonja-ro, Hwasung, 445-330, Gyeonggi-do, Republic of Korea;2. Department of Urban, Energy, and Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk, 28644, Republic of Korea;3. Department of Advanced Material Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk, 28644, Republic of Korea;4. Department of Materials Science and Engineering, Dankook University, 119 Dandae-ro, Cheonan, 31116, Republic of Korea |
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| Abstract: | The structural stability under reducing environment and oxygen permeation fluxes of perovskite-type BaCexFe1−xO3−δ (0 ≤ x ≤ 0.15) ceramic membranes were investigated. The XRD results showed that 5% of cerium doping into the perovskite B-site can make the BaFeO3−δ transform from the hexagonal structure to the cubic structure, and make the structure stable under 10% H2–Ar mixed gas at 900 °C for 1 h, but breaks down after 5 h. Lattice parameters and oxygen non-stoichiometry of the as-prepared and reduced samples were measured. Oxygen permeation fluxes of the membranes were measured between 700 and 950 °C. Oxygen permeation during the cooling and heating circles showed that 5% of cerium doping into the perovskite B-site can avoid the phase transformation. The optimum cerium-doped amount on the B-sites was found to be 10%. |
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