Crystal structure and equation of state of Fe-Si alloys at super-Earth core conditions

Wicks, June K.; Smith, Raymond F.; Fratanduono, Dayne E.; Coppari, Federica; Kraus, Richard G.; Newman, Matthew G.; Rygg, J. Ryan; Eggert, Jon H.; Duffy, Thomas S.

doi:10.1126/sciadv.aao5864

Title: Crystal structure and equation of state of Fe-Si alloys at super-Earth core conditions

Journal Article · 25 April 2018 · Science Advances

DOI: https://doi.org/10.1126/sciadv.aao5864 · OSTI ID:1634289

^[1];

^[2]; Fratanduono, Dayne E. ^[2]; Coppari, Federica ^[2];

^[2]; Newman, Matthew G. ^[3];

^[4];

^[2]; Duffy, Thomas S. ^[5]

Princeton Univ., NJ (United States). Dept of Geosciences; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Earth and Planetary Sciences
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Engineering and Applied Sciences
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Dept. of Physics and Astronomy
Princeton Univ., NJ (United States). Dept of Geosciences

In this paper, the high-pressure behavior of Fe alloys governs the interior structure and dynamics of super-Earths, rocky extrasolar planets that could be as much as ten times more massive than Earth. In experiments reaching up to 1300 GPa, we combine laser-driven dynamic ramp compression with in situ X-ray diffraction to study the effect of composition on the crystal structure and density of Fe-Si alloys, a potential constituent of super-Earth cores. We find that Fe-7wt.%Si adopts the hexagonal close packed (hcp) structure over the measured pressure range, whereas Fe-15wt.%Si is observed in a body-centered cubic (bcc) structure. This study represents the first experimental determination of the density and crystal structure of Fe-Si alloys at pressures corresponding to the center of a ~3 Earth-mass terrestrial planet. Our results allow for direct determination of the effects of light elements on core radius, density, and pressures for such planets.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Laboratory Directed Research and Development (LDRD) Program

Contributing Organization:: Laboratory for Laser Energetics

Grant/Contract Number:: AC52-07NA27344; NA0002154; NA0002720; 15-ERD-012; NA0003611

OSTI ID:: 1634289

Alternate ID(s):: OSTI ID: 1406024; OSTI ID: 1439048

Report Number(s):: LLNL-JRNL-777740; 969807

Journal Information:: Science Advances, Vol. 4, Issue 4; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 47 works

Citation information provided by
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