Local atomic structure of a near-sigma 5 tilt grain boundary in MgO
Local atomic structure of a near-sigma 5 tilt grain boundary in MgO
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DOI：
10.1007/s10853-013-7340-7
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发表时间：
2013-04
影响因子：
4.5
通讯作者：
M. Saito;Zhongchang Wang;S. Tsukimoto;Y. Ikuhara
中科院分区：
文献类型：
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作者：
M. Saito;Zhongchang Wang;S. Tsukimoto;Y. Ikuhara
要清楚地理解多晶材料中的结构-性质关系，需要对晶界(GB)结构进行原子分辨率成像，特别是对于错位的晶界结构。在本研究中，我们应用双晶技术制备了具有可调键合角的Σ-5和近-Σ-5带，并证明了带内的不对准可以用周期位移的完全位错阵列来补偿。原子分辨率图像显示，近Σ5 GB是由一组正常的Σ5 GB结构单位组成的，这些结构单位被变形的Σ17 GB单位插入。所给出的原子尺度表征也适用于一系列多晶材料中的其他GB物种。
Clear understanding of the structure–property relation in polycrystalline materials requires atomic-resolution imaging of grain boundary (GB) structures especially for the GBs with misalignments. In this study, we apply a bicrystal technique to fabricate the Σ5 and near-Σ5 GBs of MgO with tunable bonding angle and demonstrate that the misalignments in GBs could be compensated by a periodic displacement shift complete dislocation array. The atomic-resolution images reveal that the near-Σ5 GB is composed of an array of normal Σ5 GB structural units intercalated by deformed Σ17 GB units. The atomic-scale characterization presented is applicable to other GB species in a range of polycrystalline materials.