Higginbotham A, Stubley P G, Comley A J, Eggert J H, Foster J M, Kalantar D H, McGonegle D, Patel S, Peacock L J, Rothman S D, Smith R F, Suggit M J, Wark J S
Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, UK.
Sci Rep. 2016 Apr 13;6:24211. doi: 10.1038/srep24211.
The elastic and inelastic response of [001] oriented silicon to laser compression has been a topic of considerable discussion for well over a decade, yet there has been little progress in understanding the basic behaviour of this apparently simple material. We present experimental x-ray diffraction data showing complex elastic strain profiles in laser compressed samples on nanosecond timescales. We also present molecular dynamics and elasticity code modelling which suggests that a pressure induced phase transition is the cause of the previously reported 'anomalous' elastic waves. Moreover, this interpretation allows for measurement of the kinetic timescales for transition. This model is also discussed in the wider context of reported deformation of silicon to rapid compression in the literature.
十多年来，[001] 取向硅对激光压缩的弹性和非弹性响应一直是一个备受讨论的话题，但在理解这种看似简单的材料的基本行为方面进展甚微。我们展示了实验X射线衍射数据，这些数据显示了在纳秒时间尺度上激光压缩样品中复杂的弹性应变分布。我们还展示了分子动力学和弹性代码建模，这表明压力诱导的相变是先前报道的“异常”弹性波的原因。此外，这种解释允许测量转变的动力学时间尺度。本文还在文献中报道的硅在快速压缩下的变形这一更广泛背景下讨论了该模型。
