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SrCoO_2.5+δ的结构和氧脱附行为研究

Investigation of the structure and oxygen diffusion behavior of SrCoO_2.5+δ

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【Author】 FENG Shao-jie~1,YI Jian-xin~2 (1.Department of Materials Science and Engineering,Anhui Institute of Architecture & Industry,Hefei 230022,China;2.Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China)

【机构】安徽建筑工业学院材料科学与工程系；中国科技大学材料科学与工程系合肥230022；合肥230026；

【摘要】采用固相反应法合成了SrCoO2.5+δ样品,用XRD表征了在空气和纯氧气氛下自然降温以及淬火后SrCoO2.5+δ的结构;利用程序升温脱附技术(TPD)考察了在高纯He气氛下SrCoO2.5+δ的氧脱附行为。XRD结果表明,经自然降温方式得到SrCoO2.5+δ的结构是六方结构,而经淬火得到的SrCoO2.5+δ表现为brownmil-lerite结构;SrCoO2.5+δ的氧脱附行为与其相结构有很大的关系,在纯氧气氛下降温的SrCoO2.5+δ在中高温区出现了3个相转变过程。更多还原

【Abstract】 The SrCoO_2.5+δ was synthesized by solid state reaction,and the structures of different samples cooling under air and pure oxygen atmosphere were characterized by XRD.O₂-TPD technique was used to study the oxygen diffusion behavior of SrCoO_2.5+δ.The H-hexagonal and brownmillerite structures appeared when the samples were cooled slowly and quenched respectively.The oxygen diffusion behavior of SrCoO_2.5+δ has relation with the structure.There were three phase transitions during 600¹000 ℃ for SrCoO_2.5+δ for which cooling under pure oxygen.更多还原