Investigation on cation distribution and magnetic properties in self-doped manganites La_{0.6鈭?span style='font-style: italic'>x}Sr_0.4MnO_{3鈭?span style='font-style: italic'>未}

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• 作者：Shao-Peng Liu^a ; ^b ; Yan Xie^b ; Gui-De Tang^a ; ^{tanggd@mail.hebtu.edu.cn} ; Zhuang-zhi Li^a ; Deng-hui Ji^a ; Yan-Feng Li^a ; Deng-Lu Hou^a
• 关键词：Perovskite manganite ; Curie temperature ; Cation vacancy ; Crystal structure
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：June, 2012
• 卷：324
• 期：12
• 页码：1992-1997
• 文件大小：1425 K

摘要

Self-doped manganites with nominal composition La_0.6鈭?em>xSr_0.4MnO_3鈭?em>未 (0鈮?em>x鈮?.175) have been prepared by the sol-gel method. The X-ray diffraction (XRD) patterns and magnetic measurements indicate that the samples have two phases with the ABO₃ perovskite structure being the dominant phase and Mn₃O₄ being the minor phase when the doping level x鈮?.05. On the basis of the thermal equilibrium theory of crystal defects, the contents of various ions in the perovskite phases were estimated, in which there are Mn²⁺ ions and no vacancies at A sites. The ion contents have been corrected by Rietveld fitting of the powder samples' X-ray diffraction data. The change tendency of the Curie temperature T_C vs. the Mn⁴⁺ ion content ratio at the B sites of ABO₃ perovskite phase is in accord with the experimental result of the samples La_1鈭?em>xSr_xMnO₃.