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Structural study of Li2MnO3 by electron microscopy

机译:Li 2 MnO 3 的电子显微镜结构研究

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Detailed crystallographic data on high-quality Li2MnO3 material has been obtained using a combination of X-ray diffraction (XRD), selected-area electron diffraction (SAED), high-resolution electron microscopy (HREM), and 0.1 nm probe high-angle annular dark-field imaging (HAADF) in a scanning transmission electron microscope. A high-purity Li2MnO3 powder was annealed at 950 °C for 3 days to obtain predominantly defect-free grains which average size was 3.0 ± 1.5 μm. Rietveld refinement indicated that the C2/m spacegroup provided the best fit for the XRD data. Electron diffraction patterns obtained along various zone axes, on defect-free oxide particles, could be uniquely indexed to the monoclinic structure. HREM and HAADF images of defect-free grains were consistent with a Li–Mn–Mn– arrangement, i.e., lithium ordering in the transition metal planes. Low-magnification TEM images occasionally revealed stacking defects within oxide particles. HREM images of sample areas containing defects revealed a low density of stacking faults within the monoclinic sequence, resulting in a trigonal P3 1 12 local arrangement.
机译:结合使用X射线衍射(XRD),选择区域电子衍射(SAED),高质量Li 2 MnO 3 材料获得了详细的晶体学数据高分辨率电子显微镜(HREM),以及扫描透射电子显微镜中的0.1 nm探针高角度环形暗场成像(HAADF)。将高纯度的Li 2 MnO 3 粉末在950°C退火3天,获得平均尺寸为3.0±1.5μm的主要无缺陷晶粒。 Rietveld的改进表明C2 / m空间群最适合XRD数据。在无缺陷的氧化物颗粒上沿各个区域轴获得的电子衍射图可以唯一地标引到单斜晶结构。无缺陷晶粒的HREM和HAADF图像符合Li-Mn-Mn-排列,即过渡金属平面中的锂有序排列。低倍TEM图像偶尔显示出氧化物颗粒内的堆积缺陷。包含缺陷的样本区域的HREM图像显示出单斜序列中堆积缺陷的密度低,从而形成了三角形P3 1 12局部排列。

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