title: Dynamic X-ray diffraction observation of shocked solid iron up to 170 GPa.
abstract: Investigation of the iron phase diagram under high pressure and temperature is crucial for the determination of the composition of the cores of rocky planets and for better understanding the generation of planetary magnetic fields. Here we present X-ray diffraction results from laser-driven shock-compressed single-crystal and polycrystalline iron, indicating the presence of solid hexagonal close-packed iron up to pressure of at least 170 GPa along the principal Hugoniot, corresponding to a temperature of 4,150 K. This is confirmed by the agreement between the pressure obtained from the measurement of the iron volume in the sample and the inferred shock strength from velocimetry deductions. Results presented in this study are of the first importance regarding pure Fe phase diagram probed under dynamic compression and can be applied to study conditions that are relevant to Earth and super-Earth cores.
authors.affiliation: Laboratoire d'Utilisation de Lasers Intenses - CNRS, Ecole Polytechnique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, F-91128 Palaiseau Cedex, France; Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS, Laboratoire d'Utilisation des Lasers Intenses, place Jussieu, 75252 Paris Cedex 05, France; adrien.denoeud@gmail.com.
authors.forename: Adrien
authors.initials: A
authors.lastname: Denoeud
authors.affiliation: Graduate School of Engineering, Osaka University, Osaka 5650871, Japan; Photon Pioneers Center, Osaka University, Osaka 5650871, Japan;
authors.forename: Norimasa
authors.initials: N
authors.lastname: Ozaki
authors.affiliation: Laboratoire d'Utilisation de Lasers Intenses - CNRS, Ecole Polytechnique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, F-91128 Palaiseau Cedex, France; Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS, Laboratoire d'Utilisation des Lasers Intenses, place Jussieu, 75252 Paris Cedex 05, France;
authors.forename: Alessandra
authors.initials: A
authors.lastname: Benuzzi-Mounaix
authors.affiliation: Graduate School of Engineering, Osaka University, Osaka 5650871, Japan;
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Uranishi
authors.affiliation: Graduate School of Engineering, Osaka University, Osaka 5650871, Japan;
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Kondo
authors.affiliation: Graduate School of Engineering, Osaka University, Osaka 5650871, Japan; Photon Pioneers Center, Osaka University, Osaka 5650871, Japan;
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kodama
authors.affiliation: Laboratoire d'Utilisation de Lasers Intenses - CNRS, Ecole Polytechnique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, F-91128 Palaiseau Cedex, France; Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS, Laboratoire d'Utilisation des Lasers Intenses, place Jussieu, 75252 Paris Cedex 05, France;
authors.forename: Erik
authors.initials: E
authors.lastname: Brambrink
authors.affiliation: Laboratoire d'Utilisation de Lasers Intenses - CNRS, Ecole Polytechnique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, F-91128 Palaiseau Cedex, France; Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS, Laboratoire d'Utilisation des Lasers Intenses, place Jussieu, 75252 Paris Cedex 05, France;
authors.forename: Alessandra
authors.initials: A
authors.lastname: Ravasio
authors.affiliation: Laboratoire d'Utilisation de Lasers Intenses - CNRS, Ecole Polytechnique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, F-91128 Palaiseau Cedex, France; Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS, Laboratoire d'Utilisation des Lasers Intenses, place Jussieu, 75252 Paris Cedex 05, France;
authors.forename: Maimouna
authors.initials: M
authors.lastname: Bocoum
authors.affiliation: Laboratoire d'Utilisation de Lasers Intenses - CNRS, Ecole Polytechnique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, F-91128 Palaiseau Cedex, France; Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS, Laboratoire d'Utilisation des Lasers Intenses, place Jussieu, 75252 Paris Cedex 05, France;
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Boudenne
authors.affiliation: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Universités - Université Pierre et Marie Curie, CNRS, Muséum National d'Histoire Naturelle, Institut de Recherche pour le Développement, 75005 Paris, France;
authors.forename: Marion
authors.initials: M
authors.lastname: Harmand
authors.affiliation: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Universités - Université Pierre et Marie Curie, CNRS, Muséum National d'Histoire Naturelle, Institut de Recherche pour le Développement, 75005 Paris, France;
authors.forename: François
authors.initials: F
authors.lastname: Guyot
authors.affiliation: Laboratoire Univers et Théories, Observatoire de Paris, CNRS, Université Paris Diderot, 92195 Meudon, France;
authors.forename: Stephane
authors.initials: S
authors.lastname: Mazevet
authors.affiliation: Centre for Plasma Physics, School of Maths & Physics, Queens University Belfast, Belfast BT7 1NN, Northern Ireland;
authors.forename: David
authors.initials: D
authors.lastname: Riley
authors.affiliation: Centre for Plasma Physics, School of Maths & Physics, Queens University Belfast, Belfast BT7 1NN, Northern Ireland;
authors.forename: Mikako
authors.initials: M
authors.lastname: Makita
authors.affiliation: Institute of Laser Engineering, Osaka University, Osaka 5650871, Japan;
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Sano
authors.affiliation: Institute of Laser Engineering, Osaka University, Osaka 5650871, Japan;
authors.forename: Youichi
authors.initials: Y
authors.lastname: Sakawa
authors.affiliation: RIKEN SPring-8 Center, Hyogo 679-5148, Japan; Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Inubushi
authors.affiliation: Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom;
authors.forename: Gianluca
authors.initials: G
authors.lastname: Gregori
authors.affiliation: Laboratoire d'Utilisation de Lasers Intenses - CNRS, Ecole Polytechnique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, F-91128 Palaiseau Cedex, France; Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS, Laboratoire d'Utilisation des Lasers Intenses, place Jussieu, 75252 Paris Cedex 05, France; Institute for Academic Initiatives, Osaka University, Osaka 565-0871, Japan.
authors.forename: Michel
authors.initials: M
authors.lastname: Koenig
authors.affiliation: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Universités - Université Pierre et Marie Curie, CNRS, Muséum National d'Histoire Naturelle, Institut de Recherche pour le Développement, 75005 Paris, France;
authors.forename: Guillaume
authors.initials: G
authors.lastname: Morard
keywords: Earth core; X-ray diffraction; dynamic compression; iron phase diagram; shock-compressed iron