Coordination changes in liquid tin under shock compression determined using in situ femtosecond x-ray diffraction
Coordination changes in liquid tin under shock compression determined using in situ femtosecond x-ray diffraction
复制标题
DOI：
10.1063/1.5127291
复制
发表时间：
2019-12-23
影响因子：
4
通讯作者：
Fratanduono, D. E.
中科院分区：
文献类型：
--
作者：
Briggs, R.;Gorman, M. G.;Fratanduono, D. E.
关于被压缩到极端条件下的材料的液体结构知之甚少，而关于在纳秒时间尺度上经历快速压缩的液体结构更是知之甚少。在这里，我们报告的液体结构因子和径向分布函数测量压缩到84（19）GPa的锡冲击。在直线加速器相干光源处的高质量飞秒X射线衍射测量用于提取液体漫散射信号。从径向分布函数，我们发现，随着压力的增加，液体的结构演化模拟的固相的演变。随着压力的增加，我们发现，液体结构演变从一个复杂的结构，具有低的配位数，一个简单的液体结构与配位数类似的12。我们为未来的实验提供了一条途径，以研究液体在高压下使用高能激光冲击压缩材料超出静态金刚石砧座技术的范围。
Little is known regarding the liquid structure of materials compressed to extreme conditions, and even less is known about liquid structures undergoing rapid compression on nanosecond timescales. Here, we report on liquid structure factor and radial distribution function measurements of tin shock compressed to 84(19) GPa. High-quality, femtosecond x-ray diffraction measurements at the Linac Coherent Light Source were used to extract the liquid diffuse scattering signal. From the radial distribution function, we find that the structural evolution of the liquid with increasing pressure mimics the evolution of the solid phase. With increasing pressure, we find that the liquid structure evolves from a complex structure, with a low coordination number, to a simple liquid structure with a coordination number of similar to 12. We provide a pathway for future experiments to study liquids at elevated pressures using high-energy lasers to shock compress materials beyond the reach of static diamond anvil cell techniques.