| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Vinci, Tommaso
École Polytechnique
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2024Shock-driven amorphization and melt in Fe$_2$O$_3$
- 2023Transonic dislocation propagation in diamond.citations
- 2023Zr-based metallic glasses Hugoniot under laser shock compression and spall strength evolution with the strain rate >10$^7$ s$^{-1}$)citations
- 2023Zr-based metallic glasses Hugoniot under laser shock compression and spall strength evolution with the strain rate (> 107 s-1)citations
- 2023Transonic dislocation propagation in diamondcitations
- 2022Zr-based bulk metallic glasses equation of state under laser shock compression and spall strength
- 2022Zr-based bulk metallic glasses equation of state under laser shock compression and spall strengths.
- 2021Spin State of Iron in Dynamically Compressed Olivine Melt
- 2021Metallization of Shock-Compressed Liquid Ammoniacitations
- 2021X-ray powder diffraction in reflection geometry on multi-beam kJ-type laser facilitiescitations
- 2020Equation of state and electrical conductivity of warm dense ammonia at the conditions of large icy planets' interiors.
- 2020In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressurescitations
- 2020Direct Observation of Shock‐Induced Disordering of Enstatite Below the Melting Temperaturecitations
- 2020Ultrafast X-ray Diffraction Measurements Of shock-Compressed Fe and Fe-Si Alloys
- 2017Shock response to solid germanium
- 2016Direct structural investigation of shock compressed silicates from x-ray diffraction
- 2016Kinetics of the iron α -∊ phase transition at high-strain rates: Experiment and modelcitations
- 2014Melting of iron close to Earth's inner core boundary conditions detected by XANES spectroscopy in laser shock experiment
- 2010Large scale simulations of quasi-isentropic compression in Fe and Al
- 2009Microstructural investigation of melting in laser-shocked recovered iron foils
- 2006Laser-driven shock waves for the study of extreme matter statescitations
Places of action
| Organizations | Location | People |
|---|
document
Spin State of Iron in Dynamically Compressed Olivine Melt
Abstract
The density contrast between silicate melts and solids is essential for understanding early differentiation of rocky planets and the origin of the present-day low-velocity structures in the Earths deep interior. Studies have found that the electronic spin state of Fe impacts the density of silicates by altering their volume and solid/liquid Fe partitioning at the pressure-temperature conditions expected for the Earths deep mantle. Previous static compression studies indicate that high-spin Fe is dominant up to the pressures of the Earths core-mantle boundary in the most abundant lower-mantle phase, bridgmanite. However, the spin behavior of Fe in molten silicates is poorly known at deep mantle conditions due to experimental challenges. We have conducted simultaneous measurements of X-ray diffraction (XRD) and X-ray emission spectroscopy (XES) on dynamically compressed olivine melt at the Matter in Extreme Conditions (MEC) beamline of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory. XRD data showed that the local structure of the molten olivine is similar to those found in silicate glasses. XES spectra show low-spin Fe in olivine melt at pressures between 140 and 280 GPa at temperatures over 4000 K. The dominant low-spin state of Fe in the melt is in sharp contrast with the reported spin state of Fe in compressed silicate glasses under cold static compression where a significant fraction of Fe remains high spin even at the pressures relevant for the Earths core-mantle boundary. The contrasting spin behavior suggests the importance of thermal relaxation of local structures in melt for the stability of low-spin Fe at high pressures. The dominant low-spin Fe in olivine melt supports the strong partitioning of Fe into the melt and higher silicate melt densities. This would result in negatively buoyant silicate melts in the deep interior of the crystallizing early magma ocean and the observed low-velocity structures found near the present-day Earths core-mantle boundary....