MR016-0010
Hematite phase diagram under laser shock compression

Wednesday, 16 December 2020
Poster
Alexis Amouretti1, Marion Harmand1, Antoine Boury2, Bruno Albertazzi3, Alessandra Benuzzi-Mounaix4, Alex Chin5, Guyot Francois6, Michel Koenig4, Dominik Kraus7, Olivier Mathon8, Sakura Pascarelli8, Charles Pépin9, Katja Voigt7, Anja Schuster7, Nicolas Sévelin-Radiguet10, Arnaud Sollier11, Raffaella Torchio8, Tommaso Vinci12, Min Zhang7 and Guillaume Fiquet13, (1)IMPMC Institut de Minéralogie et de Physique des Milieux Condensés, Paris Cedex 05, France, (2)IMPMC, Paris, France, (3)Osaka University, Osaka, Japan, (4)Ecole Polytechnique, LULI / CNRS, Palaiseau Cedex, France, (5)Laboratory for Laser Energetics, Rochester, United States, (6)Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Paris Cedex 05, France, (7)Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany, (8)ESRF European Synchrotron Radiation Facility, Grenoble, France, (9)CEA-DAM-DIF, Arpajon, France, (10)ESRF, Grenoble, France, (11)CEA Commissariat à l'Energie Atomique DAM, Arpajon Cedex, France, (12)LULI, Ecole Polytechnique, CNRS, CEA, UPMC, Palaiseau, France, (13)Sorbonne Université - MNHN - CNRS - IMPMC, Paris, France
Abstract:
Until recently, iron oxides were assumed to comprise only FeO, Fe3O4, and Fe2O3. However, static compression experiments have demonstrated the existence of new iron oxide stoichiometries at high pressure and temperature such as FeO2 [1], Fe4O5 [2], Fe5O6 [3], Fe13O19 [4]. These discoveries, with the wide variety of iron oxides phases existing at high pressure [5], highlight the complexity of iron-oxygen phase diagram at extreme condition. In this context, measurements of physical properties, phase transition processes and phase diagrams of Fe-O systems with laser shock compression techniques offer opportunities to extend the actual pressure and temperature ranges of such studies. Here, we will present main results from a laser shock experiment at the ID24 ESRF beamline using time-resolved X-ray absorption measurement on Fe2O3 samples. In addition, we will show results from a recent experiment performed at LULI 2000 to measure the equation of state and calculate sound velocities along the Fe2O3 Hugoniot and above 500GPa.

[1] Hu2016
[2] Lavina 2011
[3] Lavina 2015
[4] Merlini 2015
[5] Bykova 2016

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