High pressure thermoelasticity and sound velocities of Fe-Ni-Si alloys

Morrison, Rachel A.; Jackson, Jennifer M.; Sturhahn, Wolfgang; Zhao, Jiyong; Toellner, Thomas S.

doi:10.1016/j.pepi.2019.05.011

High pressure thermoelasticity and sound velocities of Fe-Ni-Si alloys

Journal Article · Sun Sep 01 00:00:00 EDT 2019 · Physics of the Earth and Planetary Interiors

DOI:https://doi.org/10.1016/j.pepi.2019.05.011· OSTI ID:1559451

^[1]; Jackson, Jennifer M. ^[2]; Sturhahn, Wolfgang ^[2]; Zhao, Jiyong ^[3]; Toellner, Thomas S. ^[3]

California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Seismological Lab.; Exxon Mobil, Spring, TX (United States)
California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Seismological Lab.
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

The Earth's iron-dominant core is known to contain nickel from cosmochemical analysis and some amount of light elements from geophysical constraints on density and seismic wave velocities. Although there have been several studies to constrain thermoelastic properties of iron-alloys, there has been no systematic study on the effects of nickel and light elements on properties of iron using the same experimental methods and data analysis approach. We conducted nuclear resonant inelastic X-ray scattering and X-ray diffraction experiments on body-centered cubic and hexagonal close-packed (hcp) Fe_0.91Ni_0.09 and Fe_0.8Ni_0.1Si_0.1 up to 104 GPa and 86 GPa, respectively, and compare to similar measurements conducted on hcp-Fe up to 171 GPa. Specifically, we determine the Debye sound velocity from the low-energy transfer region of the (partial) phonon density of states (DOS) using the equation of state determined for each material and a new approach which utilizes information criteria and probability distributions. Nickel decreases the shear velocity of iron, while 10 at% Si has little to no effect on the shear velocity of Fe_0.91Ni_0.09. We observe that the shape of the phonon DOS of these alloys remains similar with increasing pressure. In the measured compression range, we therefore apply a generalized scaling law to describe the volume dependence of the phonon DOS and find that the vibrational Grüneisen parameters of hcp-Fe_0.91Ni_0.09 are nearly indistinguishable from those hcp-Fe and those for Fe_0.8Ni_0.1Si_0.1 trend lower. From the vibrational free energy, we constrain the harmonic vibrational component of thermal pressure, which shows a significant positive deviation from theoretical calculations of hcp-Fe at pressures and temperatures of Earth's core. Collectively, our results demonstrate that the effects of nickel should be considered when modeling iron-rich planetary cores.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC); W.M. Keck Foundation, Los Angeles, CA (United States)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1559451

Journal Information:: Physics of the Earth and Planetary Interiors, Journal Name: Physics of the Earth and Planetary Interiors Journal Issue: C Vol. 294; ISSN 0031-9201

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Temperature of Earth's core constrained from melting of Fe and Fe_0.9Ni_0.1 at high pressures

Journal Article · Mon Aug 01 00:00:00 EDT 2016 · Earth and Planetary Science Letters · OSTI ID:1340498

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36 MATERIALS SCIENCE
Earth’s core
Grüneisen parameter
high pressure
nuclear resonant inelastic x-ray spectroscopy
sound velocity

Supplementary Information for: High pressure thermoelasticity and sound velocities of Fe-Ni-Si alloys Morrison, Rachel A. https://doi.org/10.17632/jgd3gw2pzy The current record is supplemented by this dataset	dataset	January 2019
Supplementary Information for: High pressure thermoelasticity and sound velocities of Fe-Ni-Si alloys Morrison, Rachel A. https://doi.org/10.17632/jgd3gw2pzy.1 The current record is supplemented by this dataset	dataset	January 2019

High pressure thermoelasticity and sound velocities of Fe-Ni-Si alloys

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