中文摘要：

采用乙二胺四乙酸（EDTA）-柠檬酸配位法制备具有钙钛矿结构的Ba0.5Sr0.5Fe1-xNixO3-δ（x=0、0.03、0.05、0.07和0.1）混合导体氧化物,考察Ni掺杂量对材料结构与性能的影响。借助于X线衍射仪（XRD）、扫描电子显微镜（SEM）和氧渗透性能分析,对试样的相组成、微观形貌、热膨胀行为以及氧渗透性能进行测试与表征。结果表明：少量Ni的掺杂可以提高试样的透氧性能,当Ni的掺杂量较低（x〈0.07）时,试样为单一的钙钛矿相,具有较好的氧渗透性能及稳定性。当Ni掺杂量较高（x≥0.1）时,试样中出现第二相,且氧渗透性能随第二相的出现而大幅降低。

英文摘要：

Mixed oxygen ionic and electronic conducting oxides of Ba0.5Sr0.5Fe1-xNixO3-δ（x=0,0.03,0.05,0.07,0.1） were synthesized via a combined ethylenediaminetetraacetic acid（EDTA）-citrate complexing route.The effects of Ni-doping on structure and properties of Ba0.5Sr0.5FeO3-δ were investigated.The phase composition,morphology,thermal expansion,and oxygen permeability were analyzed by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,thermal expansion technique,and homemade gas measurement device.Results showed that only perovskite-type structure existed when x was less than 0.07,the membrane had desirable oxygen permeability and stability.However,the oxygen permeability was rapidly decreased because of the generation of second phase when x was more than 0.1.