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Periodically twinned SiC nanowires

机译：周期性孪晶SiC纳米线

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Twinning has been recognized to be an important microstructural defect in nanoscale materials. Periodically twinned SiC nanowires were largely synthesized by the carbothermal reduction of a carbonaceous silica xerogel prepared from tetraethoxysilane and biphenyl with iron nitrate as an additive. The twinned beta-SiC nanowires, with a hexagonal cross section, a diameter of 50-300 nm and a length of tens to hundreds of micrometers, feature a zigzag arrangement of periodically twinned segments with a rather uniform thickness along the entire growth length. Computer simulation has been used to generate three-dimensional atomic structures of the zigzag columnar twin structure by the stacking of hexagonal discs of {111} planes of SiC. A minimum surface energy and strain energy argument is proposed to explain the formation of periodic twins in the SiC nanowires. The thickness of the periodic twinned segments is found to be linearly proportional to the nanowire diameter, and a constant volume model is proposed to explain the relation.
机译：孪晶已被认为是纳米级材料中的重要微结构缺陷。通过碳热还原由四乙氧基硅烷和联苯与硝酸铁作为添加剂制备的碳质二氧化硅干凝胶，可以大体上合成周期性孪晶SiC纳米线。孪生的β-SiC纳米线的横截面为六边形，直径为50-300 nm，长度为几十至数百微米，其特征是周期性成对链节的锯齿形排列，其厚度沿整个生长长度相当均匀。计算机模拟已用于通过堆叠SiC的{111}平面的六角形圆盘来生成之字形柱状孪晶结构的三维原子结构。提出了最小表面能和应变能参数来解释SiC纳米线中周期性孪晶的形成。发现周期性孪生链段的厚度与纳米线直径成线性比例，并提出了恒定体积模型来解释这种关系。

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