Characterization of ripplocation mobility in graphite
Characterization of ripplocation mobility in graphite
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DOI：
10.1080/21663831.2019.1702115
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发表时间：
2020-01-01
影响因子：
8.3
通讯作者：
Tucker, G. J.
中科院分区：
文献类型：
--
作者：
Gruber, J.;Barsoum, M. W.;Tucker, G. J.
最近的研究表明，层状固体通过基底面的屈曲变形。当局部孤立时，如石墨，这些屈曲，称为波纹，表面上与位错相似，但没有汉堡矢量。通过原子模拟，我们证明了即使在低温下，石墨中的波纹也可以在许多紧密间隔的能态之间轻松转换。在60至350 K之间，它们的迁移势垒估计为32 meV，与段长度无关。波纹自发地向空位迁移，远离压应力。这些结果揭示了这一新的微观机制，并有可能解释通过基于位错的模型无法充分描述的实验观察结果。这些结果揭示了这种新的微观机制，波纹的高迁移率和空位相互作用可能解释了通过基于位错的模型无法充分描述的实验观察结果。
Recent work suggests that layered solids deform through buckling of basal planes. When isolated locally, as in graphite, these buckles, termed ripplocations, behave superficially similar to dislocations, but have no Burgers vectors. Through atomistic simulations, we demonstrate the easy transitions of ripplocations in graphite between many closely-spaced energy states, even at low temperatures. Between 60 and 350 K, their migration barrier is estimated at 32 meV, independent of segment length. Ripplocations spontaneously migrate towards vacancies and away from compressive stresses. These results shed more light on this new micromechanism and potentially explain experimental observations that evade sufficient description through dislocation-based models.[GRAPHICS]IMPACT STATEMENTThese results shed more light on this new micromechanism and the high mobility and vacancy interactions of ripplocations potentially explain experimental observations that evade sufficient description through dislocation-based model.