Direct imaging of the distortions of MnO6 octahedra in La0.4Ca2.6Mn2O7

Direct imaging of the distortions of MnO6 octahedra in La0.4Ca2.6Mn2O7
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La0.4Ca2.6Mn2O7 中 MnO6 八面体变形的直接成像

DOI:
10.1063/1.4772684
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发表时间:
2013-01
影响因子:
3.2
通讯作者:
Ge, Binghui
Ge, Binghui
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wang, Yumei;Yu, Richeng;Ge, Binghui

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利用200 kV高分辨率透射电子显微镜研究了层状锰矿La0.4Ca2.6Mn2O7中MnO6八面体的畸变,这些畸变对层状锰矿La0.4Ca2.6Mn2O7的结构转变和物理性质起着关键作用。四方相、正交相(上层结构)和单斜相以微畴的形式共存。特别是,通过图像反卷积,在原子分辨率上直接揭示了MnO6八面体在正交相和单斜相中的畸变。由MnO6八面体的旋转或倾斜引起的Mn原子柱的位置、大小和对比度在四方相、正交相和单斜相之间的差异直接从相应的结构投影图中得到。
The distortions of MnO6 octahedra in layered manganites La0.4Ca2.6Mn2O7, which play a key role in the structure transformations and physical properties, were investigated by using a 200 kV high-resolution transmission electron microscope. Tetragonal, orthorhombic (superstructure), and monoclinic phases were found to coexist in the form of microdomains. In particular, the distortions of MnO6 octahedra in the orthorhombic and monoclinic phases were revealed directly at atomic resolution by means of image deconvolution. The differences of the Mn atomic columns in position, size, and contrast among the tetragonal, orthorhombic, and monoclinic phases, caused by the rotation or tilt of the MnO6 octahedra, were directly obtained from the corresponding structure projection maps.
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