High-resolution transmission electron microscopy and computational analyses of atomic structures of [0001] symmetric tilt grain boundaries of Al2O3 with equivalent grain-boundary planes
High-resolution transmission electron microscopy and computational analyses of atomic structures of [0001] symmetric tilt grain boundaries of Al2O3 with equivalent grain-boundary planes
复制标题
具有等效晶界平面的Al2O3[0001]对称倾斜晶界原子结构的高分辨率透射电子显微镜和计算分析
DOI：
10.1080/14786430310001613228
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发表时间：
2003
影响因子：
1.6
通讯作者：
Yuichi Ikuhara
中科院分区：
文献类型：
--
作者：
K. Matsunaga;Hitoshi Nishimura;T. Saito;T. Yamamoto;Yuichi Ikuhara
制备了含有[0001]对称倾斜晶界的Al2O3双晶，以研究其晶界核心处的原子结构。本文研究的晶界具有晶体学上等效的晶界面，尽管它们具有不同的晶界值。晶界结构进行了研究，高分辨率透射电子显微镜（HRTEM）和静态晶格计算的离子势的基础上。高分辨透射电镜观察结果表明，在晶界平面上，707和7021晶界表现出不对称的核心结构。从静态晶格计算，它被发现，这两个晶界有类似的刚体位移垂直于倾斜轴，也包含在其核心的开放空间。晶界核结构的相似性表明晶界核的特征强烈地依赖于晶界面的特征。
Al2O3 bicrystals containing [0001] symmetric tilt grain boundaries were fabricated to investigate atomic structures at their grain-boundary cores. Σ7 and Σ21 boundaries studied here have crystallographically equivalent grain-boundary planes of although they have different Σ values. Grain-boundary structures were studied by high-resolution transmission electron microscopy (HRTEM) and static lattice calculations based on ionic potentials. HRTEM observations showed that the Σ7 and Σ21 boundaries exhibited asymmetric core structures with respect to their grain-boundary planes. From static lattice calculations, it was found that these two grain boundaries have similar rigid-body shifts normal to the tilt axis and also contain open spaces at their core. The similarity of their core structures indicates that characteristics of grain-boundary cores strongly depend on features of grain-boundary planes.