Titre :

Ultrafast X-ray Diffraction Study of a Shock-Compressed Iron Meteorite above 100 GPa

Auteur(s) :

Tecklenburg, Sabrina [Auteur]
Stanford EARTH
Colina-Ruiz, Roberto [Auteur]
Stanford Synchrotron Radiation Lightsource [SSRL SLAC]
Hok, Sovanndara [Auteur]
Stanford EARTH
Bolme, Cynthia [Auteur]
Los Alamos National Laboratory [LANL]
Galtier, Eric [Auteur]
Linac Coherent Light Source [LCLS]
Granados, Eduardo [Auteur]
Linac Coherent Light Source [LCLS]
Hashim, Akel [Auteur]
Stanford Synchrotron Radiation Lightsource [SSRL SLAC]
Lee, Hae Ja [Auteur]
Linac Coherent Light Source [LCLS]
Merkel, Sébastien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Morrow, Benjamin [Auteur]
Los Alamos National Laboratory [LANL]
Nagler, Bob [Auteur]
Linac Coherent Light Source [LCLS]
Ramos, Kyle [Auteur]
Los Alamos National Laboratory [LANL]
Rittman, Dylan [Auteur]
Stanford EARTH
Walroth, Richard [Auteur]
Stanford Synchrotron Radiation Lightsource [SSRL SLAC]
Mao, Wendy L. [Auteur]
Stanford EARTH
Gleason, Arianna E. [Auteur]
Stanford EARTH

Titre de la revue :

Minerals

Numéro :

11

Pagination :

567

Éditeur :

MDPI AG

Date de publication :

2021-05-26

ISSN :

2075-163X

Mot(s)-clé(s) en anglais :

ultrafast X-ray diffraction
laser shock compression
iron meteorite

Discipline(s) HAL :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre

Résumé en anglais : [en]

Natural kamacite samples (Fe92.5Ni7.5) from a fragment of the Gibeon meteorite were studied as a proxy material for terrestrial cores to examine phase transition kinetics under shock compression for a range of different ...
Lire la suite >Natural kamacite samples (Fe92.5Ni7.5) from a fragment of the Gibeon meteorite were studied as a proxy material for terrestrial cores to examine phase transition kinetics under shock compression for a range of different pressures up to 140 GPa. In situ time-resolved X-ray diffraction (XRD) data were collected of a body-centered cubic (bcc) kamacite section that transforms to the high-pressure hexagonal close-packed (hcp) phase with sub-nanosecond temporal resolution. The coarse-grained crystal of kamacite rapidly transformed to highly oriented crystallites of the hcp phase at maximum compression. The hcp phase persisted for as long as 9.5 ns following shock release. Comparing the c/a ratio with previous static and dynamic work on Fe and Fe-rich Fe-Ni alloys, it was found that some shots exhibit a larger than ideal c/a ratio, up to nearly 1.65. This work represents the first time-resolved laser shock compression structural study of a natural iron meteorite, relevant for understanding the dynamic material properties of metallic planetary bodies during impact events and Earth’s core elasticity.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Matériaux Terrestres et Planétaires

Date de dépôt :

2021-05-27T09:15:28Z
2021-06-10T10:37:38Z