In situ X-Ray Diffraction of Shock-Compressed Fused Silica

Sally June Tracy, Stefan J. Turneaure, Thomas S. Duffy

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21 Scopus citations

Abstract

Because of its widespread applications in materials science and geophysics, SiO2 has been extensively examined under shock compression. Both quartz and fused silica transform through a so-called "mixed-phase region" to a dense, low compressibility high-pressure phase. For decades, the nature of this phase has been a subject of debate. Proposed structures include crystalline stishovite, another high-pressure crystalline phase, or a dense amorphous phase. Here we use plate-impact experiments and pulsed synchrotron x-ray diffraction to examine the structure of fused silica shock compressed to 63 GPa. In contrast to recent laser-driven compression experiments, we find that fused silica adopts a dense amorphous structure at 34 GPa and below. When compressed above 34 GPa, fused silica transforms to untextured polycrystalline stishovite. Our results can explain previously ambiguous features of the shock-compression behavior of fused silica and are consistent with recent molecular dynamics simulations. Stishovite grain sizes are estimated to be ∼5-30 nm for compression over a few hundred nanosecond time scale.

Original languageEnglish (US)
Article number135702
JournalPhysical review letters
Volume120
Issue number13
DOIs
StatePublished - Mar 29 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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