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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Atomic structure and core composition of partial dislocations and dislocation fronts in beta-SiC by high-resolution transmission electron microscopy
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Atomic structure and core composition of partial dislocations and dislocation fronts in beta-SiC by high-resolution transmission electron microscopy

机译：高分辨率透射电镜观察β-SiC中部分位错和位错前沿的原子结构和核组成

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We study the atomic structure of single dislocations and of dislocation fronts in recrystallized beta -SiC, using high-resolution transmission electron microscopy images of edge-on defects. The Burgers vectors of the defects are determined on the images. The structural units (SUs) and the core composition of the defects are obtained by an analysis of the image contrast. Single 30 degrees Si(glissile) or 30 degrees C(glissile) are emitted during recrystallization of beta -SiC at T > 1900 degreesC. Their SU verifies the model proposed for elementary and compound semiconductors. The dislocation fronts gliding under thermal or thermodynamic stresses consist of a pile-up of different Shockley partials. The dislocation triplets consist of one 90 degrees C(glissile) and two 30 degrees Si(glissile) or vice versa. The core compositions of the 90 degrees and of the 30 degrees partial dislocations are also different in the fronts of two dislocations characterized by a Burgers vector equal to 1/12 < 112 >a(c). The SUs of the dislocation fronts are due to a reconstruction of the SUS characteristic of the 90 and of the 30 degrees SUs. The probability of formation of the dislocation fronts is independent of the core composition of the partials. [References: 34]
机译：我们使用边缘缺陷的高分辨率透射电子显微镜图像研究了单晶位错和重结晶β-SiC中的位错前沿的原子结构。在图像上确定缺陷的Burgers向量。缺陷的结构单元（SU）和核心成分是通过分析图像对比度获得的。 β-SiC在T> 1900摄氏度下重结晶时，会发出30摄氏度（硅）或30摄氏度（硅）。他们的SU验证了为基本和复合半导体提出的模型。在热应力或热力学应力作用下滑动的位错前沿由不同的Shockley零件堆积而成。位错三胞胎由一个90摄氏度（滑行）和两个30摄氏度（滑行）组成，反之亦然。 90度和30度部分位错的核心成分在两个位错的前端也不同，其特征是Burgers向量等于1/12 <112> a（c）。位错前沿的SU归因于90度和30度SU的SUS特性的重建。位错前沿形成的可能性与部分的核心组成无关。 [参考：34]

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