ULTRAFAST X-RAY DIFFRACTION STUDY OF A SHOCK-COMPRESSED IRON-NICKEL METEORITE TO CONDITIONS RELEVANT TO PLANETARY CORES

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Abstract/Contents

Abstract: Natural kamacite samples (Fe92.5Ni7.5) from a fragment of the Gibeon meteorite were studied as a proxy for terrestrial core material 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 from a body-centered cubic (bcc) kamacite section that transforms to the high-pressure hexagonal close-packed (hcp) phase with sub-nanosecond temporal resolution. The starting coarse-grained kamacite crystals 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 in metallic planetary bodies during impact events and the evolution of the elastic behavior of the Earth’s core.

Subject	School of Earth Energy & Environmental Sciences
Subject	Geological Sciences
Subject	Mineral physics
Genre	Text
Genre	Thesis

Related item	Preferred citation Tecklenburg, Sabrina, Roberto Colina-Ruiz, Sovanndara Hok, Cynthia Bolme, Eric Galtier, Eduardo Granados, Akel Hashim, Hae J. Lee, Sébastien Merkel, Benjamin Morrow, Bob Nagler, Kyle Ramos, Dylan Rittman, Richard Walroth, Wendy L. Mao, and Arianna E. Gleason 2021. "Ultrafast X-ray Diffraction Study of a Shock-Compressed Iron Meteorite above 100 GPa" Minerals 11, no. 6: 567. https://doi.org/10.3390/min11060567
DOI	https://doi.org/10.25740/jy496xk0370
Location	https://purl.stanford.edu/jy496xk0370

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Preferred citation: Tecklenburg, S. (2021). ULTRAFAST X-RAY DIFFRACTION STUDY OF A SHOCK-COMPRESSED IRON-NICKEL METEORITE TO CONDITIONS RELEVANT TO PLANETARY CORES. Stanford Digital Repository. Available at https://purl.stanford.edu/jy496xk0370

Master's Theses, Doerr School of Sustainability

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