A5017711551- High-pressure geophysics and materials
- Astro and Planetary Science
- Geological and Geochemical Analysis
- Planetary Science and Exploration
- Diamond and Carbon-based Materials Research
- Laser-induced spectroscopy and plasma
- Advanced Chemical Physics Studies
- Geology and Paleoclimatology Research
- Astrophysics and Star Formation Studies
- Laser-Plasma Interactions and Diagnostics
- Crystal Structures and Properties
- Geomagnetism and Paleomagnetism Studies
- Atmospheric chemistry and aerosols
- Earthquake Detection and Analysis
- Isotope Analysis in Ecology
- Glass properties and applications
- Inorganic Fluorides and Related Compounds
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
École Polytechnique
2016-2023
Centre National de la Recherche Scientifique
2016-2023
Laboratoire pour l'utilisation des lasers intenses
2016-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2023
Sorbonne Université
2016-2023
CEA Paris-Saclay
2016-2021
Université Paris-Panthéon-Assas
2021
Osaka University
2020
Okayama University
2020
Center for High Pressure Science and Technology Advanced Research
2020
We report an experimental study of the phase diagrams periclase (MgO), enstatite (MgSiO3) and forsterite (Mg2SiO4) at high pressures. investigated with laser driven decaying shocks pressure/temperature curves MgO, MgSiO3 Mg2SiO4 between 0.2-1.2 TPa, 0.12-0.5 TPa 0.2-0.85 respectively. A melting signature has been observed in MgO 0.47 9860 K, while no changes were neither nor Mg2SiO4. An increasing reflectivity liquids have detected 0.55 -12 760 0.15 - 7540 0.2 5800 In contrast to SiO2,...
Ammonia is predicted to be one of the major components in depths ice giant planets Uranus and Neptune. Their dynamics, evolution, interior structure are insufficiently understood models rely imperatively on data for equation state transport properties. Despite its great significance, experimentally accessed region ammonia phase diagram today still very limited pressure temperature. Here we push probed regime unprecedented conditions, up $\ensuremath{\sim}350\text{ }\text{ }\mathrm{GPa}$...
Significance Understanding the structural changes silicate melts undergo over pressure–temperature range of Earth’s mantle has been a major, longstanding challenge in geosciences. Experimental studies are extremely difficult due to required temperatures exceeding 4,000 K needed melt silicates megabar pressures. To overcome this issue, laser-driven shock experiments combined with X-ray free-electron lasers were performed provide nanosecond resolution on transformations. By comparison...
Abstract Understanding materials behaviour under extreme thermodynamic conditions is fundamental in many branches of science, including High-Energy-Density physics, fusion research, material and planetary science. Silica (SiO 2 ) primary importance as a key component rocky planets’ mantles. Dynamic compression the most promising approach to explore molten silicates conditions. Although experimental studies are restricted Hugoniot curve, wider range must be reached distill temperature...
Water, ethanol, and ammonia are the key components of mantles Uranus Neptune. To improve structure evolution models give an explanation magnetic fields luminosities icy giants, those need to be characterised at planetary conditions (some Mbar a few $10^3$ K). Those typical Warm Dense Matter regime, which exhibits rich phase diagram, with coexistence many states matter large variety chemical processes. H$_2$O, C:H:O, C:H:N:O mixtures have been compressed up 2.8 along principal Hugoniot using...
Abstract We report in situ structural measurements of shock‐compressed single crystal orthoenstatite up to 337 ± 55 GPa on the Hugoniot, obtained by coupling ultrafast X‐ray diffraction laser‐driven shock compression. Shock compression induces a disordering crystalline structure evidenced appearance diffuse signal at nanosecond timescales 80 13 well below equilibrium melting pressure (>170 GPa). The formation bridgmanite and post‐perovskite have been indirectly reported microsecond‐scale...
Carbonate minerals, for example calcite and magnesite, exist on the planetary surfaces of Earth, Mars, Venus, are subjected to hypervelocity collisions. The physical properties materials at extreme conditions essential understanding their dynamic behaviors collisions mantle structure rocky planets including Super-Earths. Here we report laboratory investigations laser-shocked pressures 200–960 GPa (impact velocities 12–30 km/s faster than escape velocity from Earth) using decay shock...
An ultrafast x-ray powder diffraction setup for laser-driven dynamic compression has been developed at the LULI2000 laser facility. X-ray is performed in reflection geometry from a quasi-monochromatic laser-generated plasma source. In comparison to transmission setup, this configuration allows us probe only small portion of compressed sample, as well shield detectors against x-rays generated by laser–plasma interaction on front side target. Thus, new platform facilitates probing spatially...
Characterizing materials at pressures of several megabars and temperatures a few thousand Kelvin is critical for the understanding Warm Dense Matter regime to improve planetary models as these conditions are typical planets' interiors. The laser-driven shock compression technique capable simultaneously achieving Kelvin, but explored states too hot be representative Double-shock provides an alternative probe lower temperatures. Here, we present method create well-controlled double-shocked...
We report time-resolved X-ray Absorption Near Edge Spectroscopy (XANES) measurements of warm dense MgO. used a high power nanosecond pulse to drive strong uniform shock wave into an MgO sample, and picosecond generate broadband source near the Mg K-edge. this setup obtain XANES spectra across large area phase diagram, with densities up 6.8 g/cc temperatures 30 000 K, conditions at which no prior investigations electronic ionic structure exist. Our results, together quantum molecular dynamic...
Abstract Calcite (CaCO 3 ) as a planetary material is source to the atmospheric carbon dioxide through degassing by high-velocity impact events. Revealing behavior of calcite in extreme pressure and temperature conditions required understand impact-induced phenomena. Here we report laboratory investigations shock- compressed beyond velocity 12 km/s (faster than escape from Earth). The present precise shock measurements elucidate shape Hugoniot curve continuously passing melting metallization...
<p>Ammonia is predicted to be one of the major components in depths ice giant planets Uranus and Neptune. Their dynamics, evolution, interior structure are insufficiently understood models rely imperatively on data for equation state transport properties [1,2]. Despite its great significance, experimentally accessed region ammonia phase diagram today still very limited pressure temperature [3, 4].</p><p>We investigate state, optical electrical...