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

doi:10.1029/2017JB015343

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 Fe _0.91Ni _0.09 and Fe _0.8Ni _0.1Si _0.1 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 Fe _0.95Ni _0.05 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 ofmore »« less

Authors:

^[1];

^[2];

^[3]

California Inst. of Technology (CalTech), Pasadena, CA (United States)
Univ. of Hawaii at Manoa, Honolulu, HI (United States); Univ. of Chicago, Argonne, IL (United States)
Univ. of Chicago, Chicago, IL (United States)

Publication Date:: 2018-04-30

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:: 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.

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                    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.

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                    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.

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@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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DOI: 10.1029/2017JB015343

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Works referenced in this record:

Hydrostatic limits of 11 pressure transmitting media
journal, March 2009

Klotz, S.; Chervin, J-C.; Munsch, P.
Journal of Physics D: Applied Physics, Vol. 42, Issue 7, Article No. 075413
DOI: 10.1088/0022-3727/42/7/075413

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

Abstract

Citation Formats

Hydrostatic limits of 11 pressure transmitting media journal, March 2009

Hydrostatic limits of 11 pressure transmitting media
journal, March 2009