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

Sabrina Tecklenburg; Roberto Colina-Ruiz; Sovanndara Hok; Cynthia Bolme; Eric Galtier; Eduardo Granados; Akel Hashim; Hae Ja Lee; Sébastien Merkel; Benjamin Morrow; Bob Nagler; Kyle Ramos; Dylan Rittman; Richard Walroth; Wendy L. Mao; Arianna E. Gleason

doi:10.3390/min11060567

Minerals (May 2021)

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

Sabrina Tecklenburg,
Roberto Colina-Ruiz,
Sovanndara Hok,
Cynthia Bolme,
Eric Galtier,
Eduardo Granados,
Akel Hashim,
Hae Ja Lee,
Sébastien Merkel,
Benjamin Morrow,
Bob Nagler,
Kyle Ramos,
Dylan Rittman,
Richard Walroth,
Wendy L. Mao,
Arianna E. Gleason

Affiliations

Sabrina Tecklenburg: Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
Roberto Colina-Ruiz: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Sovanndara Hok: Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
Cynthia Bolme: Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Eric Galtier: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Eduardo Granados: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Akel Hashim: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Hae Ja Lee: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Sébastien Merkel: Unité Matériaux et Transformations Cité scientifique, CNRS, INRAE, Centrale Lille, UMR 8207—UMET, F-59000 Lille, France
Benjamin Morrow: Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Bob Nagler: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Kyle Ramos: Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Dylan Rittman: Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
Richard Walroth: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Wendy L. Mao: Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
Arianna E. Gleason: Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA

DOI: https://doi.org/10.3390/min11060567
Journal volume & issue: Vol. 11, no. 6
p. 567

Abstract

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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.

Published in Minerals

ISSN: 2075-163X (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Geology: Mineralogy
Website: https://www.mdpi.com/journal/minerals

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