Ripplocations in layered materials: Sublinear scaling and basal climb
Ripplocations in layered materials: Sublinear scaling and basal climb
复制标题
DOI：
10.1103/physrevb.103.195436
复制
发表时间：
2020-12
期刊：
影响因子：
--
通讯作者：
J. G. Mchugh;P. Mouratidis;K. Jolley
中科院分区：
文献类型：
--
作者：
J. G. Mchugh;P. Mouratidis;K. Jolley
波纹是层状材料所特有的一种结晶学缺陷，它将纳米尺度的分层与基面位错的晶体滑移结合在一起。在这里，我们使用分析和计算技术研究了基面位错和波纹。导出了表面波纹的能量标度因子和结构标度因子的表达式，它们与经典地毯褶皱的物理性质密切对应。我们的模拟表明，层状材料中位错堆积的最低能量结构是波纹位错，而块状石墨中较大的位错堆积则表现出多层分层、曲率和空洞。这可以为辐照后的石墨中出现的大体积膨胀提供一个简明的解释。
The ripplocation is a crystallographic defect which is unique to layered materials, combining nanocale delamination with the crystallographic slip of a basal dislocation. Here, we have studied basal dislocations and ripplocations using analytical and computational techniques. Expressions for the energetic and structural scaling factors of surface ripplocations are derived, which are in close correspondence to the physics of a classical carpet ruck. Our simulations demonstrate that the lowest-energy structure of dislocation pile-ups in layered materials is the ripplocation, while large dislocation pile-ups in bulk graphite demonstrate multilayer delamination, curvature and voids. This can provide a concise explanation for the large volumetric expansion seen in irradiated graphite.