Iron and iron alloys under laser compression at XFEL for planetary science
Abstract
An accurate knowledge of the properties of iron and iron alloys at high pressures and temperatures is crucial for geophysics and planetary science. In particular, detailed information on melting curves and solid phases are required to anchor the Earth's thermal profile at the Inner Core Boundary (ICB) and to assess the solid or liquid nature of exoplanets cores. In that context, XFEL sources coupled with high-energy lasers are affording unique opportunities to measure microscopic structural properties at extreme condtions. Here we present recent studies devoted to investigate the solid-solid and solid-liquid transition in laser-shocked iron and iron alloys using both X-ray diffraction and X-ray Absorption Near-Edge Spectroscopy (XANES) [1]. Experiment were performed at the MEC end-station of the LCLS facility at SLAC (USA) as well as the EH5 end station of SACLA - Spring-8 faciltiy (Japan). The ultrafast time resolution achieved on XFEL gives confidence in tracking dynamical processes during laser shock compression. Our results allow to further constrain the iron and iron alloys phase diagram up to 5Mbar.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMMR11A2374H
- Keywords:
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- 3919 Equations of state;
- MINERAL PHYSICSDE: 3924 High-pressure behavior;
- MINERAL PHYSICSDE: 3944 Shock wave experiments;
- MINERAL PHYSICSDE: 3994 Instruments and techniques;
- MINERAL PHYSICS