Time-resolved diffraction of shock-released SiO2 and diaplectic glass formation

Gleason, A. E.; Bolme, Cynthia; Lee, H. J.; Nagler, Bob; Galtier, Eric; Kraus, R. G.; Sandberg, Richard L.; Yang, Wenge; Langenhorst, F.; Mao, Wendy L.

doi:10.1038/s41467-017-01791-y

Cited by 40 publications

(30 citation statements)

References 36 publications

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“…Above this temperature threshhold, the requisite thermal energy is available to overcome an activation barrier, promoting small atomic displacements required to transform the highly- nanosecond timescales [25,64]. While the highest pressure datum in that study (34 ±5 GPa) overlaps our results, stishovite peaks were also observed at 19 GPa and below where we observe only amorphous material despite two orders of magnitude longer compression time.…”

supporting

confidence: 49%

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

2018

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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.

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supporting

confidence: 49%

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

2018

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“…Compression Sector (DCS) at the Advanced Photon Source (Argonne, IL) has linked a variety of planar shock compression drivers to a third-generation synchrotron light source -have provided new insights into a number of structural transformations [15][16][17][18]. Similarly, XRD measurements using an x-ray free electron laser have examined phase transformation in shorter duration shock wave experiments [19,20].…”

Section: Recent Experimental Advances Utilizing New Xrd Capabilities mentioning

confidence: 99%

Structural transformations including melting and recrystallization during shock compression and release of germanium up to 45 GPa

et al. 2019

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Solid-solid and solid-liquid transformations were examined in Ge(100), using in situ xray diffraction measurements during uniaxial strain compression and release. For final stresses above 15.7 GPa, the Ge transformed to a highly textured tetragonal β-Sn phase. At 31.5 GPa and above, Ge transformed to the molten phase. Full stress release (uniaxial strain) from the β-Sn phase, from the melt boundary, and from the completely molten phase, resulted in reversion to an untextured cubic diamond (cd) phase. These findings demonstrate that the cd to β-Sn phase change is reversible, and that recrystallization from the liquid phase occurs on nanosecond timescales during release.

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“…These more extreme conditions drive a fraction of the matrix material into the β-quartz region of phase space. Figure 9 in the supplementary material shows the two calculated P-T states plotted on the phasediagram for silica, taken from Gleason et al 36 This result shows clearly that initial granular arrangement can have a marked response on the thermodynamic conditions in a shocked bimodal powder system.…”

Section: Figmentioning

confidence: 89%

“…Even at this extreme, the matrix material lies within the α-quartz region of silica phase space. 36 In the tomography-initialized simulations, however, the distribution of on-axis P-T conditions extend from a peak of (1.2 GPa, 798 K) to (2.1 GPa, 1385 K). These more extreme conditions drive a fraction of the matrix material into the β-quartz region of phase space.…”

Section: Figmentioning

confidence: 92%