Oxygen content and magnetic properties of composites La_(0.75)Sr_(0.25)MnO_(3±δ) dcalcined at different temperatures  

作　　者：Deng-Hui Ji Xue Hou Gui-De Tang Zhuang-Zhi Li Deng-Lu Hou Ming-Gang Zhu 

机构地区：[1]Hebei Advanced Thin Films Laboratory,Department of Physics,Hebei Normal University [2]Division of Functional Materials Research,Central Iron & Steel Research Institute

出　　处：《Rare Metals》2014年第4期452-458,共7页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.NSF-11174069);the Natural Science Foundation of Hebei Province(No.E2011205083);the Key Item Science Foundation of Hebei Province(No.10965125D);the Key Item Science Foundation of the Education Department of Hebei Province(No.ZD2010129)

摘　　要：The effects of the calcination temperature on the oxygen content and magnetic properties of the nano- crystalline perovskite manganite Lao.75Sro.25MnO3±δ pre- pared by the sol-gel method were investigated. The highest temperatures at which the samples were calcined were 973, 1073, 1273, and 1473 K. The X-ray diffraction （XRD） analyses indicate that all the samples have only a single phase with the R3c perovskite structure. As the calcination temperature and calcination time increase, the oxygen content in the samples increases from being deficient to being in excess of that in the stoichiometric formula. The crystallite size also increases from 23 to 283 nm. Magnetic measurements indicate that the sample calcined at 1073 K has the highest Curie temperature. This is owing to the fact that the crystallite cores of this sample have stoichiometric oxygen content. The dependence of the Curie temperature and the saturation magnetization on the calcination tem- perature are successfully explained.The effects of the calcination temperature on the oxygen content and magnetic properties of the nano- crystalline perovskite manganite Lao.75Sro.25MnO3±δ pre- pared by the sol-gel method were investigated. The highest temperatures at which the samples were calcined were 973, 1073, 1273, and 1473 K. The X-ray diffraction （XRD） analyses indicate that all the samples have only a single phase with the R3c perovskite structure. As the calcination temperature and calcination time increase, the oxygen content in the samples increases from being deficient to being in excess of that in the stoichiometric formula. The crystallite size also increases from 23 to 283 nm. Magnetic measurements indicate that the sample calcined at 1073 K has the highest Curie temperature. This is owing to the fact that the crystallite cores of this sample have stoichiometric oxygen content. The dependence of the Curie temperature and the saturation magnetization on the calcination tem- perature are successfully explained.

关 键 词：Perovskite manganite Magnetic property Oxygen content Sol-gel method 

分 类 号：TB332[一般工业技术—材料科学与工程]