Electron Diffraction of La0.27Pr0.4Ca0.33MnO3 with Charge Ordering Phase
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：卢遵铭 赵勇 孟祥熙 董斌 李养贤
文章页码：18 - 20
摘 要：Polycrystalline sample of La0.27Pr0.4Ca0.33MnO3 was synthesized by a conventional solid state reaction. The electron diffraction and dark-field imaging of the finely grinded sample were prepared. X-ray diffraction reveals that the sample is of single phase with an orthorhombic distorted perovskite structure. The electron diffraction evidence of the charge ordering in La0.27Pr0.4Ca0.33MnO3, obtained at room temperature （293 K）, represents a [-101] zone-axis electron diffraction pattern. The diffraction pattern can be indexed with the known orthorhombic crystal structure （space group Pbnm）. Sharp superlattice spots can be observed clearly in addition to the fundamental Bragg reflections. The superlattice peak, which can be attributed to the modulating of Mn3+ ions and Mn4+ ions, is the evidence of the presence of the charge ordering at room temperature.
卢遵铭，赵勇，孟祥熙，董斌，李养贤
摘 要：Polycrystalline sample of La0.27Pr0.4Ca0.33MnO3 was synthesized by a conventional solid state reaction. The electron diffraction and dark-field imaging of the finely grinded sample were prepared. X-ray diffraction reveals that the sample is of single phase with an orthorhombic distorted perovskite structure. The electron diffraction evidence of the charge ordering in La0.27Pr0.4Ca0.33MnO3, obtained at room temperature （293 K）, represents a [-101] zone-axis electron diffraction pattern. The diffraction pattern can be indexed with the known orthorhombic crystal structure （space group Pbnm）. Sharp superlattice spots can be observed clearly in addition to the fundamental Bragg reflections. The superlattice peak, which can be attributed to the modulating of Mn3+ ions and Mn4+ ions, is the evidence of the presence of the charge ordering at room temperature.
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