论文标题
在板块冲击压缩下α-Quartz的结构响应
Structural response of alpha-quartz under plate-impact shock compression
论文作者
论文摘要
由于其在地球物理学和材料科学中的影响深远，石英一直是动态压缩下最广泛检查的材料之一。尽管进行了50年的积极研究，但在冲击压缩下SIO2的结构和转化仍然存在问题。连续气体枪研究已经确定，在休克载荷下，石英通过假定的混合相区域转化为密集的高压阶段。尽管经常假定这个高压阶段对应于静态实验中观察到的Stishovite结构，但没有原子级的结构数据证实了这一点。在这项研究中，我们使用与原位同步加速器X射线衍射相结合的气体枪冲击压缩，以询问冲击压缩的α-Quartz中的晶体结构，最高为65 GPA。我们的结果表明，α-Quartz经历了一个相对于无序的亚稳相变的相位转化，而不是晶体stishovite或无定形相，对这种基本材料的动态响应的长期假设提出了挑战。
Due to its far-reaching applications in geophysics and materials science, quartz has been one of the most extensively examined materials under dynamic compression. Despite 50 years of active research, questions remain concerning the structure and transformation of SiO2 under shock compression. Continuum gas-gun studies have established that under shock loading quartz transforms through an assumed mixed-phase region to a dense high-pressure phase. While it has been often assumed that this high-pressure phase corresponds to the stishovite structure observed in static experiments, there has been no atomic-level structure data confirming this. In this study, we use gas-gun shock compression coupled with in-situ synchrotron X-ray diffraction to interrogate the crystal structure in shock-compressed alpha-quartz up to 65 GPa. Our results reveal that alpha-quartz undergoes a phase transformation to a disordered metastable phase as opposed to crystalline stishovite or an amorphous phase, challenging long-standing assumptions about the dynamic response of this fundamental material.
