<i>In situ</i>x-ray diffraction study of dynamically compressed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math>-cristobalite using a dynamic diamond anvil cell

Schoelmerich, Markus; Méndez, Alba San José; Plueckthun, C.; Biedermann, Nicole; Husband, R. J.; Preston, Thomas R.; Wollenweber, L.; Klimm, K; Tschentscher, Thomas; Redmer, R.; Liermann, Hanns‐Peter; Appel, Karen

doi:10.1103/physrevb.105.064109

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Schoelmerich et al conducted shock compression experiments and they found stishovite is stable along the Hugoniot up to 300 GPa. However, a follow-up experiment using the dynamic diamond anvil cell indicated that the cristobalite to seifertite transition proceeds at a higher compression rate (Schoelmerich et al, 2022). In short, the transition kinetics is the key to deciphering the seifertite metastability.…”

Section: Introductionmentioning

confidence: 99%

“…Its characteristic transformation from tetrahedral SiO 4 unit to octahedral SiO 6 structures extends to a broader class of silicate minerals, providing valuable insights into the density and seismic discontinuities within Earth's deep interiors. The complexity of silica polymorphism and its importance in Earth's sciences have fueled numerous experimental and theoretical studies over the course of two decades, delving into the underlying mechanisms driving its phase transitions (Donadio et al., 2008; Kubo et al., 2015; Schoelmerich et al., 2022). As noted above, the unique occurrence of seifertite makes it an exceptional candidate to study both kinetic and thermodynamic phase transitions in silica.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic and Thermodynamic Transition Pathways of Silica by Machine Learning: Implication for Meteorite Impacts

Cao,

Han,

et al. 2024

JGR Solid Earth

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Rocks falling to Earth from space may generate pressure and temperature approaching Earth's deep mantle, but such meteorite impact only persists for a very short period. Under these extreme conditions, kinetical factors largely control mineral phase transitions, in which the resultant phase may deviate from those at thermal equilibrium. Here, we focus on the phase transitions of silica during meteorite impact, and have elucidated multiple pathways from low‐coordinated silica to seifertite, the densest known silica found in meteorite samples. Utilizing a high‐dimensional neuro‐network potential specifically designed for silica, we exhaustively map the potential energy landscape through stochastic surface walking and uncover low‐barrier transition pathways toward seifertite at pressures far away from thermal equilibrium. These kinetic‐driven transitions are then characterized by first‐principles simulations, revealing narrow transition windows of pressure, with seifertite becoming more kinetically favored over stishovite at pressures in the vicinity of 10 and 25 GPa. Our results suggest that meteorite impacts should have reached such target pressures to overcome the thermodynamic limit of forming seifertite. The presence of seifertite may provide key information in constraining the relevant dynamic compression conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic and Thermodynamic Transition Pathways of Silica by Machine Learning: Implication for Meteorite Impacts

Cao,

Han,

et al. 2024

JGR Solid Earth

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Time‐resolved Raman spectroscopy study of rapid compressed silicon and its potential as a Raman pressure scale in a dynamic diamond anvil cell

Chen,

Zhang,

Liu

et al. 2024

J Raman Spectroscopy

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The nature of the nonequilibrium states of materials upon rapid compression/decompression processes in the intermediate regime, between static and shock compression, is an emerging field of high pressure research. Rapid compression experiments were performed to examine the structural response of silicon (Si) up to 11 GPa and over compression rates ranging from 0.011 to 0.325 GPa/s, using a piezo‐driven dynamic diamond anvil cell (dDAC) coupled with time‐resolved Raman spectroscopy. The observed structural stability and the remarkable consistency in the pressure‐dependent Raman shift of the diamond cubic Si (Si‐I) showed its high potential as a Raman pressure scale for compression rate below 0.325 GPa/s. The validity of the derived Si scale was verified by in situ continuously monitoring pressure of two rapid compressed samples, that is, gypsum and ZnO. Results indicated that pressures determined using Si were in good agreement with those estimated from the ruby scale. Success in pressure calibration with Si, during time‐resolved Raman spectroscopy measurements of material under rapid compression using a dDAC, will greatly simplify the required hardware system in home‐laboratory and may also help in reaching a higher signal‐to‐noise in Raman measurement on a short time scale.

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Phase transition behavior of benzene under dynamic compression: A stable precocious phase

Yuan,

Wang,

Yang

et al. 2024

Journal of Molecular Liquids

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In situx-ray diffraction study of dynamically compressedα-cristobalite using a dynamic diamond anvil cell

Cited by 6 publications

References 41 publications

Kinetic and Thermodynamic Transition Pathways of Silica by Machine Learning: Implication for Meteorite Impacts

Kinetic and Thermodynamic Transition Pathways of Silica by Machine Learning: Implication for Meteorite Impacts

Time‐resolved Raman spectroscopy study of rapid compressed silicon and its potential as a Raman pressure scale in a dynamic diamond anvil cell

Phase transition behavior of benzene under dynamic compression: A stable precocious phase

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