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

Because of its widespread applications in materials science and geophysics, SiO 2 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.
Authors:
 [1] ;  [2] ;  [1]
  1. Princeton Univ., NJ (United States)
  2. Washington State Univ., Pullman, WA (United States)
Publication Date:
Grant/Contract Number:
NA0002442; NA0002007; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Washington State Univ., Pullman, WA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES
OSTI Identifier:
1464952
Alternate Identifier(s):
OSTI ID: 1430380; OSTI ID: 1476635

Tracy, Sally June, Turneaure, Stefan J., and Duffy, Thomas S.. In situ X-Ray Diffraction of Shock-Compressed Fused Silica. United States: N. p., Web. doi:10.1103/PhysRevLett.120.135702.
Tracy, Sally June, Turneaure, Stefan J., & Duffy, Thomas S.. In situ X-Ray Diffraction of Shock-Compressed Fused Silica. United States. doi:10.1103/PhysRevLett.120.135702.
Tracy, Sally June, Turneaure, Stefan J., and Duffy, Thomas S.. 2018. "In situ X-Ray Diffraction of Shock-Compressed Fused Silica". United States. doi:10.1103/PhysRevLett.120.135702.
@article{osti_1464952,
title = {In situ X-Ray Diffraction of Shock-Compressed Fused Silica},
author = {Tracy, Sally June and Turneaure, Stefan J. and Duffy, Thomas S.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.120.135702},
journal = {Physical Review Letters},
number = 13,
volume = 120,
place = {United States},
year = {2018},
month = {3}
}

Works referenced in this record:

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