期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 113, 期 28, 页码 7745-7749出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1512127113
关键词
X-ray diffraction; iron phase diagram; shock-compressed iron; Earth core; dynamic compression
资金
- ANR Project PLANETLAB [ANR-12-BS04-0015]
- JSPS KAKENHI [22224012]
- JSPS
- X-ray Free Electron Laser Priority Strategy Program (MEXT)
- UK Engineering and Physical Sciences Research Council [EP/M022331/1, EP/N014472/1]
- EPSRC [EP/N009487/1, EP/G007462/1, EP/K009591/1, EP/G007187/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G007187/1, EP/K009591/1, EP/N009487/1, EP/G007462/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [15H02154, 16H02246, 15K13609, 26287147, 16H01119] Funding Source: KAKEN
- Agence Nationale de la Recherche (ANR) [ANR-12-BS04-0015] Funding Source: Agence Nationale de la Recherche (ANR)
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.
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