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Title: Equations of State and Anisotropy of Fe-Ni-Si Alloys

Abstract

We present powder X–ray diffraction data on body centered cubic (bcc)– and hexagonal close packed (hcp)–structured Fe0.91Ni0.09 and Fe0.8Ni0.1Si0.1 at 300 K up to 167 and 175 GPa, respectively. The alloys were loaded with tungsten powder as a pressure calibrant and helium as a pressure transmitting medium into diamond anvil cells, and their equations of state and axial ratios were measured with high statistical quality. These equations of state are combined with thermal parameters from previous reports to improve the extrapolation of the density, adiabatic bulk modulus, and bulk sound speed to the pressures and temperatures of Earth's inner core. We propagate uncertainties and place constraints on the composition of Earth's inner core by combining these results with available data on light–element alloys of iron and seismic observations. For example, the addition of 4.3 to 5.3 wt% silicon to Fe0.95Ni0.05 alone can explain geophysical observations of the inner core boundary, as can up to 7.5 wt% sulfur with negligible amounts of silicon and oxygen. Our findings favor an inner core with less than ~2 wt% oxygen and less than 1 wt% carbon, although uncertainties in electronic and anharmonic contributions to the equations of state may shift these values. The compositionalmore » space widens toward the center of the Earth, considering inner core seismic gradients. Here, we demonstrate that hcp–Fe0.91Ni0.09 and hcp–Fe0.8Ni0.1Si0.1 have measurably greater c/a axial ratios than those of hcp–Fe over the measured pressure range. Here, we further investigate the relationship between the axial ratios, their pressure derivatives, and elastic anisotropy of hcp–structured materials.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States); Univ. of Chicago, Argonne, IL (United States)
  3. Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DODNSFOTHER; USDOE
OSTI Identifier:
1467688
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; Fe alloys; Earth's core; high pressure; X‐ray diffraction; equation of state; elastic anisotropy

Citation Formats

Morrison, Rachel A., Jackson, Jennifer M., Sturhahn, Wolfgang, Zhang, Dongzhou, and Greenberg, Eran. Equations of State and Anisotropy of Fe-Ni-Si Alloys. United States: N. p., 2018. Web. doi:10.1029/2017JB015343.
Morrison, Rachel A., Jackson, Jennifer M., Sturhahn, Wolfgang, Zhang, Dongzhou, & Greenberg, Eran. Equations of State and Anisotropy of Fe-Ni-Si Alloys. United States. doi:10.1029/2017JB015343.
Morrison, Rachel A., Jackson, Jennifer M., Sturhahn, Wolfgang, Zhang, Dongzhou, and Greenberg, Eran. Mon . "Equations of State and Anisotropy of Fe-Ni-Si Alloys". United States. doi:10.1029/2017JB015343. https://www.osti.gov/servlets/purl/1467688.
@article{osti_1467688,
title = {Equations of State and Anisotropy of Fe-Ni-Si Alloys},
author = {Morrison, Rachel A. and Jackson, Jennifer M. and Sturhahn, Wolfgang and Zhang, Dongzhou and Greenberg, Eran},
abstractNote = {We present powder X–ray diffraction data on body centered cubic (bcc)– and hexagonal close packed (hcp)–structured Fe0.91Ni0.09 and Fe0.8Ni0.1Si0.1 at 300 K up to 167 and 175 GPa, respectively. The alloys were loaded with tungsten powder as a pressure calibrant and helium as a pressure transmitting medium into diamond anvil cells, and their equations of state and axial ratios were measured with high statistical quality. These equations of state are combined with thermal parameters from previous reports to improve the extrapolation of the density, adiabatic bulk modulus, and bulk sound speed to the pressures and temperatures of Earth's inner core. We propagate uncertainties and place constraints on the composition of Earth's inner core by combining these results with available data on light–element alloys of iron and seismic observations. For example, the addition of 4.3 to 5.3 wt% silicon to Fe0.95Ni0.05 alone can explain geophysical observations of the inner core boundary, as can up to 7.5 wt% sulfur with negligible amounts of silicon and oxygen. Our findings favor an inner core with less than ~2 wt% oxygen and less than 1 wt% carbon, although uncertainties in electronic and anharmonic contributions to the equations of state may shift these values. The compositional space widens toward the center of the Earth, considering inner core seismic gradients. Here, we demonstrate that hcp–Fe0.91Ni0.09 and hcp–Fe0.8Ni0.1Si0.1 have measurably greater c/a axial ratios than those of hcp–Fe over the measured pressure range. Here, we further investigate the relationship between the axial ratios, their pressure derivatives, and elastic anisotropy of hcp–structured materials.},
doi = {10.1029/2017JB015343},
journal = {Journal of Geophysical Research. Solid Earth},
number = 6,
volume = 123,
place = {United States},
year = {2018},
month = {4}
}

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    Works referencing / citing this record:

    Velocity‐Density Systematics of Fe‐5wt%Si: Constraints on Si Content in the Earth's Inner Core
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