B1-B2 transition in shock-compressed MgO-Reference-Cited by-同舟云学术

B1-B2 transition in shock-compressed MgO

Published:2024-06-07 Issue:23 Volume:10 Page:
ISSN:2375-2548
Container-title:Science Advances
language:en
Short-container-title:Sci. Adv.

Author:

Wicks June K.¹^ORCID,Singh Saransh²^ORCID,Millot Marius²^ORCID,Fratanduono Dayne E.²^ORCID,Coppari Federica²^ORCID,Gorman Martin G.²^ORCID,Ye Zixuan³,Rygg J. Ryan⁴⁵^ORCID,Hari Anirudh³⁶⁷^ORCID,Eggert Jon H.²^ORCID,Duffy Thomas S.⁸^ORCID,Smith Raymond F.²^ORCID

Affiliation:

1. Dept. of Earth & Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA.

2. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.

3. Dept. of Earth & Planetary Sciences Div. of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.

4. Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14623, USA.

5. Dept. of Mechanical Engineering and Dept. of Physics and Astronomy, University of Rochester, Rochester, NY 14623, USA.

6. Dept. of Materials Science and Engineering and PULSE Institute, Stanford University, Stanford, CA 94305, USA.

7. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.

8. Dept. of Geosciences, Princeton University, Princeton, NJ 08544, USA.

Abstract

Magnesium oxide (MgO) is a major component of the Earth’s mantle and is expected to play a similar role in the mantles of large rocky exoplanets. At extreme pressures, MgO transitions from the NaCl B 1 crystal structure to a CsCl B 2 structure, which may have implications for exoplanetary deep mantle dynamics. In this study, we constrain the phase diagram of MgO with laser-compression along the shock Hugoniot, with simultaneous measurements of crystal structure, density, pressure, and temperature. We identify the B 1 to B 2 phase transition between 397 and 425 gigapascal (around 9700 kelvin), in agreement with recent theory that accounts for phonon anharmonicity. From 425 to 493 gigapascal, we observe a mixed-phase region of B1 and B2 coexistence. The transformation follows the Watanabe-Tokonami-Morimoto mechanism. Our data are consistent with B 2-liquid coexistence above 500 gigapascal and complete melting at 634 gigapascal. This study bridges the gap between previous theoretical and experimental studies, providing insights into the timescale of this phase transition.

Publisher

American Association for the Advancement of Science (AAAS)

Link

https://www.science.org/doi/pdf/10.1126/sciadv.adk0306

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