Free Electron Lasers represent a cutting-edge generation of large-scale facilities, generating exceptionally brilliant X-ray pulses. These pulses can be coupled with Diamond Anvil Cells (DACs) or High-Power Lasers to conduct time-resolved studies of materials under extreme conditions. Moreover, the ESRF-EBS introduces a novel high brilliance beam, enabling innovative time-resolved methodologies.
Shock compression achieves high pressure-temperature (P-T) conditions but only for a few nanoseconds. Utilizing short X-ray pulses of a few femtoseconds enables the probing of highly homogeneous samples under extreme conditions. I will present our recent research on Fe spin state measurements in liquid olivine, as well as the liquid structure of MgSiO3 exceeding 200 GPa or liquid Fe and Fe alloys at 200 GPa.
Furthermore, the MHz to kHz frequency range of the X-ray beam now permits tracking phenomena occurring in DACs at microsecond timescales. Coupling this high repetition rate with pulsed lasers enables the tracking of melting relations in the cell for homogeneous samples before chemical migration ensues. I will discuss partial melting of Fe alloys, and also recent advancements in X-ray heating of Fe, which allows for the deduction of phase diagrams and thermal conductivity when combined with in situ measurements and Finite Element Modeling.
| Subject : | : | Oral |
| Topics | : | Methodological (analytical and technical) Developments |
| Topics | : | Keynote |
| Keywords | : | High pressure ; Shock compression ; time resolved diffraction |
| PDF version | : |  PDF version |
