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Effects of Praseodymium Doping on Conductivity and Oxygen Permeability of Cobalt-Free Perovskite-Type Oxide BaFeO3-δ
Bang-zheng Wei1,2, Yu Wang1, Meng Liu1, Chen-xi Xu1,2, Ji-gui Cheng1,2
1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2.Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei 230009, China
Abstract:
Among the perovskite-type oxides with symmetrical structure applied in oxygen permeable membranes,cubic phase structure is the most favorable for oxygen permeation.In order to stabilize the cubic perovskite structure of BaFeO3-δ material at room temperature,iron was partially substituted by praseodymium.BaFe1-yPryO3-δ powders were synthesized by a solid state reaction method,and sintered samples were prepared from the synthesized BaFe1-yPryO3-δ powders.X-ray diffraction results reveal that the BaFe1-yPryO3-δ samples remain cubic structure at praseodymium substitution amount of y=0.05,0.075,0.1.Scanning electron microscope observation indicates that the sintered samples contain only a small amount of enclosed pores and the grain size of BaFe1-yPryO3-δ increase monotonically with the increase of the praseodymium doping amount,praseodymium doping promotes the grain size growth.Tests of electrical conductivity and oxygen permeation flux show that praseodymium doping improves the conduction properties of BaFe1-yPryO3-δ and BaFe0.9Pr0.1O3-δ composition has an electrical conductivity of 6.5 S/cm and an oxygen permeation of 1.112 mL/(cm2·min) at 900 ℃,respectively.High temperature XRD investigation shows that the crystal structure of BaFe0.975Pr0.025O3-δ membrane completely transform to cubic phase at 700 ℃.The present test results have shown that partially substitution of Fe by praseodymium in BaFeO3 can stabilize the cubic structure and improve the properties.
Key words:  BaFe1-yPryO3-δ  Praseodymium doping  Cubic perovskite  Oxygen permeability
FundProject:This work was supported by the National Natural Science Foundation of China (No.216060647) and the Industry-University-Research Project of Aviation Industry Corporation of China (No.cxy2012HFGD025).
镨掺杂对无钴钙钛矿型氧化物BaFeO3-δ电导率和透氧性能的影响
魏邦争1,2, 王语1, 刘梦1, 徐晨曦1,2, 程继贵1,2
1.合肥工业大学材料科学与工程学院, 合肥 230009;2.安徽省先进功能材料与器件重点实验室, 合肥 230009
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DOI:10.1063/1674-0068/31/cjcp1708165
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