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Structural response of α-quartz under plate-impact shock compression

Author(s): Tracy, Sally June; Turneaure, Stefan J; Duffy, Thomas S

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Abstract: Because of 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 often been assumed that this high-pressure phase corresponds to the stishovite structure observed in static experiments, there have been no crystal 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 of shock-compressed α-quartz up to 65 GPa. Our results reveal that α-quartz undergoes a phase transformation to a disordered metastable phase as opposed to crystalline stishovite or an amorphous structure, challenging long-standing assumptions about the dynamic response of this fundamental material.
Publication Date: 26-Aug-2020
Citation: Tracy, Sally June, Stefan J. Turneaure, and Thomas S. Duffy. "Structural response of alpha-quartz under plate-impact shock compression." Science Advances 6, no. 35 (2020). DOI: 10.1126/sciadv.abb3913
DOI: 10.1126/sciadv.abb3913
EISSN: 2375-2548
Type of Material: Journal Article
Journal/Proceeding Title: Science Advances
Version: Final published version. This is an open access article.

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