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J Hazard Mater. 2016 Aug 5;313:103-11. doi: 10.1016/j.jhazmat.2016.03.071. Epub 2016 Mar 28.

Quantitative correlation between facets defects of RDX crystals and their laser sensitivity.

Author information

1
School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China.
2
School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China. Electronic address: weiliu@uestc.edu.cn.
3
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China.
4
School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China.
5
Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China.
6
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China. Electronic address: yxd66my@163.com.
7
School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China. Electronic address: xtzu@uestc.edu.cn.

Abstract

In this work, the {210} facets of cyclotrimethylenetrinitramine (RDX) single crystals with different quality were studied by scanning electron microscopy and atomic force microscopy. Their laser sensitivity was then assessed using a direct laser ignition test irradiated with ultraviolet laser (wavelength: 355nm, pulse width: 6.4ns). Quantitative relationships between laser sensitivity and surface defects of RDX (210) and (2¯1¯0) facets were investigated. It is determined that the laser sensitivity exhibits significant correlation with the surface roughness, size of which is comparable with scales of laser wavelength. 3D FDTD simulations disclose that this relationship can be well explained with light intensity modulation effects induced by micro-defects on the initial plane wave.

KEYWORDS:

Ignition threshold; Laser sensitivity; RDX crystal facet; Surface defects

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