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

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. Princeton Univ., NJ (United States); Institute for Shock Physics, Washington State University
  2. Washington State Univ., Pullman, WA (United States)
  3. Princeton Univ., NJ (United States)

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.

Research Organization:
Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002442
OSTI ID:
1464952
Alternate ID(s):
OSTI ID: 1430380
OSTI ID: 1471611
OSTI ID: 1476635
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 120; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Sound Velocities in Shock‐Synthesized Stishovite to 72 GPa journal December 2019
Atomistic mechanisms of crack nucleation and propagation in amorphous silica journal July 2019
Direct observation of the hcp-bcc phase transition and melting along the principal Hugoniot of Mg journal January 2020
Nanosecond Melting and Recrystallization in Shock-Compressed Silicon journal September 2018

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