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

被引：2

作者：

Tecklenburg, Sabrina ^{[1
]}

Colina-Ruiz, Roberto ^{[2
]}

Hok, Sovanndara ^{[1
]}

Bolme, Cynthia ^{[3
]}

Galtier, Eric ^{[2
]}

Granados, Eduardo ^{[2
,5
]}

Hashim, Akel ^{[2
,6
]}

Lee, Hae Ja ^{[2
]}

Merkel, Sebastien ^{[4
]}

Morrow, Benjamin ^{[3
]}

Nagler, Bob ^{[2
]}

Ramos, Kyle ^{[3
]}

Rittman, Dylan ^{[1
]}

Walroth, Richard ^{[2
]}

Mao, Wendy L. ^{[1
]}

Gleason, Arianna E. ^{[1
,2
]}

机构：

[1] Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA

[2] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] CNRS, UMR 8207, Cent Lille, UMET,INRAE,Unite Mat & Transformat Cite Sci, F-59000 Lille, France

[5] CERN, CH-1211 Geneva 23, Switzerland

[6] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94704 USA

来源：

MINERALS | 2021年 / 11卷 / 06期

关键词：

ultrafast X-ray diffraction; laser shock compression; iron meteorite; HIGH-PRESSURE; NICKEL ALLOYS; EARTHS; STATE; FE; ELASTICITY; PARAMETER; MECHANISM; EQUATION;

D O I：

10.3390/min11060567

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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.

引用

页数：11

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