钙钛矿型氧化物La_(1-x)Sr_xFeO_(3-δ)的成相过程和结构  被引量:4

Study on Synthetical Process and Structure of Perovskite-type Oxide La_(1-x)Sr_xFeO_(3-δ)

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作  者:赵倩[1] 丁铁柱[1] 朱志强[1] 王强[1] 张利文[1] 

机构地区:[1]内蒙古大学理工学院物理系,内蒙古呼和浩特010021

出  处:《稀土》2006年第5期44-47,共4页Chinese Rare Earths

基  金:国家自然科学基金项目(10464001);内蒙古教育厅重大项目(NJ03119);内蒙古大学513人才项目

摘  要:利用TG-DTA热分析仪和X射线衍射(XRD)研究了固相反应法合成钙钛矿型复合氧化物L a0.6S r0.4F eO3-δ的成相过程和L a1-xS rxF eO3-δ的晶体结构。结果发现,用固相反应法合成L a0.6S r0.4F eO3-δ时,配置研磨好的粉料在烧结过程中,经过多次吸热反应,到840℃开始出现L a0.3S r0.7F eO3-δ晶相,再经过更大的吸热反应,到1000℃时,L a0.6S r0.4F eO3-δ已成为主晶相。在1250℃烧结2h样品基本上已成为单一钙钛矿型结构L a0.6S r0.4F eO3-δ。同时给出了钙钛矿型复合氧化物L a1-xS rxF eO3-δ(x=0,0.2,0.4,0.6,0.8)的晶体结构和晶粒大小。Synthetical process and the crystal structure of the perovskite-type compound oxide La0.6Sr0. 4FeO3-δ that were obtained by solid state-reaction method were studied by TG-DTA thermo-analyzer and X-ray diffraction. The results find that when La0.6Sr0.4FeO3-δ were obtained by solid state reaction method, during sintering, prepared and grinded powder began to appear crystal phase La0.3Sr0.7FeO3-δ by a few absorbing heat reactions at 840℃, La0.6Sr0.4FeO3-δ, became major crystal phase by larger absorbing heat reaction at 1000℃, and the sample became almost single perovskite -- type structure La0.6Sr0. 4FeO3-δ by sintering 2h at 1250℃. At the same time, the crystal structure and the grain sizes for perovskite-type compound oxides La1-xSrxFeO3-δ(x=0,0. 2,0. 4, 0, 6, 0. 8) are given.

关 键 词:La1-xSrxFeO3-δ 热分析 成相过程 物相结构 

分 类 号:TQ174.13[化学工程—陶瓷工业]

 

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