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Defect Structure,Electrical Property and Oxygen Permeation of Ba0.5Sr0.5Co0.8Fe0.2O3-δ
Jiang Guoshun*,Song Chunlin,Li Dongcai,Feng Shaojie,Liu Wei,Chen Chusheng
Author NameAffiliationE-mail
Jiang Guoshun* Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026 gsjiang@ustc.edu.cn 
Song Chunlin Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026  
Li Dongcai Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026  
Feng Shaojie Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026  
Liu Wei Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026  
Chen Chusheng Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026  
Abstract:
A study of oxygen permeation material Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF)is presented. The O2 -TPD,nonstoichiometry(δ),electrical conductivity(σ)and oxygen permeation were investigated. In the experiment of O2 -TPD,three oxygen-releasing peaks are observed:one peak at low temperature is attributed to the absorbed oxygen at the position of V··O,the other two peaks are related with the release of oxygen ions at two different positions in the BSCF crystal lattice. At 470℃,δ reaches minimum and σ achieves maximum:with increasing temperature,absorbed oxygen at the position of V··O is released,resulting in the first peak of O2 -TPD;the rest of absorbed oxygen entered BSCF lattice,causing the decrease of δ;the temperature dependence of the conductivity demonstrates increasing conductivity with temperatures up to a maximum at about 470℃,indicating thermally activated p-type semiconductivity,which changed to metallic conduction behavior above 470℃. Furthermore,the experiment shows that the σ maximum at the heating step is higher than that obtained at cooling step,which can be explained:when heating,some absorbed oxygen at the position of V··O enters the lattice,δ decreases and concentration of Co4+&Fe4+ increases,leading to an enhanced p-type conductivity of BSCF;on the other hand,when cooling from high temperature,absorbed oxygen at the position of V··O does not exist. In the experiment of oxygen permeation,BSCF proves to be a suitable material for oxygen-separating at above 850℃,its oxygen permeability JO2 is higher than 1 μmol/cm2 s with air as feed gas and He as sweep gas,the activation energy Ea is 63. 1 kJ/mol.
Key words:  Defect structure,Electrical property,Oxygen permeation
FundProject:
Ba0.5Sr0.5Co0.8Fe0.2O3-δ晶格缺陷、电性能与氧渗透研究
江国顺*,宋春林,李栋才,冯绍杰,刘卫,陈初升
摘要:
对新型氧渗透材料Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF)进行了O2-TPD表征、非化学计量( δ)测定、电导率(σ)测量和氧渗透性能测试的研究. 结果表明,经纯氧气氛处理后的BSCF,其O2 -TPD谱存在三个失氧峰:低温峰对应于晶格中V··O位置上的吸附氧,高温区两个峰对应于晶格中两种不同位置的晶格氧;σ对温度的实验表明,不论在升温还是降温过程中,σ在470℃左右均出现极大值,可能与BSCF体系的δ值随温度变化相关;氧渗透实验表明,850℃以上,BSCF的氧渗透率JO2较大,达到1
关键词:  电性能  氧渗透  缺陷
DOI:10.1088/1674-0068/17/1/75-78
分类号: