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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2015

X-ray absorption spectroscopy of iron at multimegabar pressures in laser shock experiments

J Bouchet
  • Fonction : Auteur
M Koenig
V Recoules

Résumé

Taking advantage of the new opportunities provided by x-ray free electron laser (FEL) sources when coupled to a long laser pulse as available at the Linear Coherent Light Source (LCLS), we have performed x-ray absorption near-edge spectroscopy (XANES) of laser shock compressed iron up to 420 GPa (±50) and 10 800 K (±1390). Visible diagnostics coupled with hydrodynamic simulations were used to infer the thermodynamical conditions along the Hugoniot and the release adiabat. A modification of the pre-edge feature at 7.12 keV in the XANES spectra is observed above pressures of 260 GPa along the Hugoniot. Comparing with ab initio calculations and with previous laser-heated diamond cell data, we propose that such changes in the XANES pre-edge could be a signature of molten iron. This interpretation then suggests that iron is molten at pressures and temperatures higher than 260 GPa (±29) and 5680 K (±700) along the principal Fe Hugoniot.
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Dates et versions

hal-01281730 , version 1 (07-11-2016)

Identifiants

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M Harmand, A Ravasio, S Mazevet, J Bouchet, A Denoeud, et al.. X-ray absorption spectroscopy of iron at multimegabar pressures in laser shock experiments. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (2), pp.024108. ⟨10.1103/PhysRevB.92.024108⟩. ⟨hal-01281730⟩
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