Seismic parameters of hcp‐Fe alloyed with Ni and Si in the Earth's inner core

Liu, Jin; Lin, Jung‐Fu; Alatas, Ahmet; Hu, Michael Y.; Zhao, Jiyong; Dubrovinsky, Leonid

doi:10.1002/2015JB012625

Title: Seismic parameters of hcp‐Fe alloyed with Ni and Si in the Earth's inner core

Abstract

Abstract Iron alloyed with Ni and Si has been suggested to be a major component of the Earth's inner core. High‐pressure results on the combined alloying effects of Ni and Si on seismic parameters of iron are thus essential for establishing satisfactory geophysical and geochemical models of the region. Here we have investigated the compressional ( V _P ) and shear ( Vs ) wave velocity‐density ( ρ ) relations, Poisson's ratio ( ν ), and seismic heterogeneity ratios ( dlnρ / dlnV _P , dlnρ / dlnV _S , and dlnV _P / dlnV _S ) of hcp‐Fe and hcp‐Fe _86.8 Ni _8.6 Si _4.6 alloy up to 206 GPa and 136 GPa, respectively, using multiple complementary techniques. Compared with the literature velocity values for hcp‐Fe and Fe‐Ni‐Si alloys, our results show that the combined addition of 9.0 wt % Ni and 2.3 wt % Si slightly increases the V _P but significantly decreases the V _S of hcp‐Fe at a given density relevant to the inner core. Such distinct alloying effects on velocities of hcp‐Fe produce a high ν of about 0.40 for the alloy at inner core densities, which is approximately 20% higher than that for hcp‐Fe. Analysis of the literature high P‐Tmore »« less

Authors:

Liu, Jin ^[1]; Lin, Jung‐Fu ^[2]; Alatas, Ahmet ^[3]; Hu, Michael Y. ^[3]; Zhao, Jiyong ^[3]; Dubrovinsky, Leonid ^[4]

Department of Geological Sciences, Jackson School of Geosciences University of Texas at Austin Austin Texas USA
Department of Geological Sciences, Jackson School of Geosciences University of Texas at Austin Austin Texas USA, Center for High Pressure Science and Advanced Technology Research Shanghai China
Advanced Photon Source Argonne National Laboratory Argonne Illinois USA
Bayerisches Geoinstitut Universität Bayreuth Bayreuth Germany

Publication Date:: Thu Feb 18 00:00:00 EST 2016

Sponsoring Org.:: USDOE

OSTI Identifier:: 1402160

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Journal of Geophysical Research. Solid Earth

Additional Journal Information:: Journal Name: Journal of Geophysical Research. Solid Earth Journal Volume: 121 Journal Issue: 2; Journal ID: ISSN 2169-9313

Publisher:: American Geophysical Union (AGU)

Country of Publication:: United States

Language:: English

Citation Formats


                    Liu, Jin, Lin, Jung‐Fu, Alatas, Ahmet, Hu, Michael Y., Zhao, Jiyong, and Dubrovinsky, Leonid. Seismic parameters of hcp‐Fe alloyed with Ni and Si in the Earth's inner core.  United States: N. p., 2016. 
Web.  doi:10.1002/2015JB012625.

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                    Liu, Jin, Lin, Jung‐Fu, Alatas, Ahmet, Hu, Michael Y., Zhao, Jiyong, & Dubrovinsky, Leonid. Seismic parameters of hcp‐Fe alloyed with Ni and Si in the Earth's inner core.  United States.  https://doi.org/10.1002/2015JB012625

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                    Liu, Jin, Lin, Jung‐Fu, Alatas, Ahmet, Hu, Michael Y., Zhao, Jiyong, and Dubrovinsky, Leonid. Thu .  
"Seismic parameters of hcp‐Fe alloyed with Ni and Si in the Earth's inner core".  United States.  https://doi.org/10.1002/2015JB012625.

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@article{osti_1402160,

  title        = {Seismic parameters of hcp‐Fe alloyed with Ni and Si in the Earth's inner core},

  author       = {Liu, Jin and Lin, Jung‐Fu and Alatas, Ahmet and Hu, Michael Y. and Zhao, Jiyong and Dubrovinsky, Leonid},

  abstractNote = {Abstract Iron alloyed with Ni and Si has been suggested to be a major component of the Earth's inner core. High‐pressure results on the combined alloying effects of Ni and Si on seismic parameters of iron are thus essential for establishing satisfactory geophysical and geochemical models of the region. Here we have investigated the compressional ( V P ) and shear ( Vs ) wave velocity‐density ( ρ ) relations, Poisson's ratio ( ν ), and seismic heterogeneity ratios ( dlnρ / dlnV P , dlnρ / dlnV S , and dlnV P / dlnV S ) of hcp‐Fe and hcp‐Fe 86.8 Ni 8.6 Si 4.6 alloy up to 206 GPa and 136 GPa, respectively, using multiple complementary techniques. Compared with the literature velocity values for hcp‐Fe and Fe‐Ni‐Si alloys, our results show that the combined addition of 9.0 wt % Ni and 2.3 wt % Si slightly increases the V P but significantly decreases the V S of hcp‐Fe at a given density relevant to the inner core. Such distinct alloying effects on velocities of hcp‐Fe produce a high ν of about 0.40 for the alloy at inner core densities, which is approximately 20% higher than that for hcp‐Fe. Analysis of the literature high P‐T results on V P and V S of Fe alloyed with light elements shows that high temperature can further enhance the ν of hcp‐Fe alloyed with Ni and Si. Most significantly, the derived seismic heterogeneity ratios of this hcp alloy present a better match with global seismic observations. Our results provide a multifactored geophysical constraint on the compositional model of the inner core which is consistent with silicon being a major light element alloyed with Fe and 5 wt % Ni.},

  doi          = {10.1002/2015JB012625},

  journal      = {Journal of Geophysical Research. Solid Earth},

  number       = 2,

  volume       = 121,

  place        = {United States},

  year         = {Thu Feb 18 00:00:00 EST 2016},

  month        = {Thu Feb 18 00:00:00 EST 2016}

}

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Title: Seismic parameters of hcp‐Fe alloyed with Ni and Si in the Earth's inner core

Abstract

Citation Formats

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Composition of the Earth's inner core from high-pressure sound velocity measurements in Fe–Ni–Si alloys journal, June 2010

The sound velocity measurements of Fe3S journal, January 2014

Terrestrial Accretion Under Oxidizing Conditions journal, January 2013

Improved focusing capability for inelastic X-ray spectrometer at 3-ID of the APS: A combination of toroidal and Kirkpatrick-Baez (KB) mirrors journal, September 2011

Heterogeneity and Anisotropy of Earth's Inner Core journal, May 2014

Mineral Physics Quest to the Earth's Core journal, January 2009

On the Presence of Liquid in Earth's Inner Core journal, March 2000

Nuclear resonant x-ray scattering of iron hydride at high pressure journal, January 2004

Effect of temperature on sound velocities of compressed Fe3C, a candidate component of the Earth's inner core journal, September 2011

Sound velocities of iron-nickel and iron-silicon alloys at high pressures journal, January 2003

Hidden carbon in Earth’s inner core revealed by shear softening in dense Fe 7 C 3 journal, December 2014

Static compression of Fe0.83Ni0.09Si0.08 alloy to 374GPa and Fe0.93Si0.07 alloy to 252GPa: Implications for the Earth's inner core journal, October 2011

Stability of the body-centred-cubic phase of iron in the Earth's inner core journal, August 2003

Shear wave anisotropy of textured hcp-Fe in the Earth's inner core journal, October 2010

CONUSS and PHOENIX: Evaluation of nuclear resonant scattering data journal, March 2000

Six-reflection meV-monochromator for synchrotron radiation journal, May 2011

Stability field of the hcp-structure for Fe, Fe-Ni, and Fe-Ni-Si alloys up to 3 Mbar: FE-NI-SI ALLOY UP TO 3 MBAR journal, May 2011

Measuring velocity of sound with nuclear resonant inelastic x-ray scattering journal, March 2003

Static compression of iron to 300 GPa and Fe 0.8 Ni 0.2 alloy to 260 GPa: Implications for composition of the core journal, January 1990

Quasihydrostatic Equation of State of Iron above 2 Mbar journal, November 2006

Composition and State of the Core journal, May 2013

Pressure-Induced Magnetization in FeO: Evidence from Elasticity and Mössbauer Spectroscopy journal, November 2004

Sound Velocities of Hot Dense Iron: Birch's Law Revisited journal, June 2005

High Poisson's ratio of Earth's inner core explained by carbon alloying journal, February 2015

Solubility of silicon in liquid metal at high pressure: implications for the composition of the Earth’s core journal, January 2001

Preliminary reference Earth model journal, June 1981

Sound velocity measurements in dhcp-FeH up to 70GPa with inelastic X-ray scattering: Implications for the composition of the Earth's core journal, January 2012

Sound velocity of iron up to 152 GPa by picosecond acoustics in diamond anvil cell
journal, February 2014

The structure of Fe–Si alloy in Earth's inner core
journal, May 2015

Elasticity of iron at the temperature of the Earth's inner core
journal, September 2001

Elasticity and constitution of the Earth's interior
journal, June 1952

Nuclear resonant scattering at high pressure and high temperature
journal, December 2004

Sound velocity of hexagonal close‐packed iron up to core pressures
journal, October 2013

Sound Velocities in Iron to 110 Gigapascals
journal, January 2001

Sound velocities for hexagonally close-packed iron compressed hydrostatically to 136 GPa from phonon density of states: SOUND VELOCITIES FOR HCP-IRON
journal, June 2013

Iron-Silicon Alloy in Earth's Core?
journal, January 2002

Elastic isotropy of ɛ-Fe under Earth's core conditions: ELASTIC ISOTROPY OF ɛ-Fe
journal, May 2010

Toward an internally consistent pressure scale
journal, May 2007

Abnormal Elastic and Vibrational Behaviors of Magnetite at High Pressures
journal, September 2014

Electrical and thermal transport properties of iron and iron-silicon alloy at high pressure: TRANSPORT PROPERTIES OF Fe AND Fe-Si
journal, October 2013

Spin crossover in ferropericlase and velocity heterogeneities in the lower mantle
journal, July 2014

Joint seismic, geodynamic and mineral physical constraints on three-dimensional mantle heterogeneity: Implications for the relative importance of thermal versus compositional heterogeneity
journal, June 2009

Phonon Density of States of Iron up to 153 Gigapascals
journal, May 2001

The Elastic Behaviour of a Crystalline Aggregate
journal, May 1952

The plastic deformation of iron at pressures of the Earth's inner core
journal, June 2000

Sound velocity of hcp-Fe at high pressure: experimental constraints, extrapolations and comparison with seismic models
journal, March 2015

Melting of iron at the physical conditions of the Earth's core
journal, January 2004

Magnetic transition and sound velocities of Fe3S at high pressure: implications for Earth and planetary cores
journal, September 2004

Experimental constraints on the thermodynamics and sound velocities of hcp-Fe to core pressures: THERMOELASTICITY OF hcp-Fe TO 171 GPa
journal, May 2013

Ab initio calculations of the elasticity of hcp-Fe as a function of temperature at inner-core pressure
journal, November 2009

Sound velocities of bcc-Fe and Fe0.85Si0.15 alloy at high pressure and temperature
journal, August 2014

The effect of nickel on the properties of iron at the conditions of Earth's inner core: Ab initio calculations of seismic wave velocities of Fe–Ni alloys
journal, March 2013

Core formation and core composition from coupled geochemical and geophysical constraints
journal, September 2015

Shock compression of Fe-Ni-Si system to 280 GPa: Implications for the composition of the Earth's outer core: Sekine, et al.: Shock compression of Fe-Ni-Si system
journal, July 2014

Simultaneous sound velocity and density measurements of hcp iron up to 93GPa and 1100K: An experimental test of the Birch's law at high temperature
journal, May 2012

Sound velocities of Fe and Fe-Si alloy in the Earth's core
journal, June 2012

Equatorial anisotropy in the inner part of Earth’s inner core from autocorrelation of earthquake coda
journal, February 2015

Effect of light elements on the sound velocities in solid iron: Implications for the composition of Earth's core
journal, February 2007

Composition of the Earth's inner core from high-pressure sound velocity measurements in Fe–Ni–Si alloys
journal, June 2010

The sound velocity measurements of Fe3S
journal, January 2014

Terrestrial Accretion Under Oxidizing Conditions
journal, January 2013

Improved focusing capability for inelastic X-ray spectrometer at 3-ID of the APS: A combination of toroidal and Kirkpatrick-Baez (KB) mirrors
journal, September 2011

Heterogeneity and Anisotropy of Earth's Inner Core
journal, May 2014

Mineral Physics Quest to the Earth's Core
journal, January 2009

On the Presence of Liquid in Earth's Inner Core
journal, March 2000

Nuclear resonant x-ray scattering of iron hydride at high pressure
journal, January 2004

Effect of temperature on sound velocities of compressed Fe3C, a candidate component of the Earth's inner core
journal, September 2011

Sound velocities of iron-nickel and iron-silicon alloys at high pressures
journal, January 2003

Hidden carbon in Earth’s inner core revealed by shear softening in dense Fe ₇ C ₃
journal, December 2014

Static compression of Fe0.83Ni0.09Si0.08 alloy to 374GPa and Fe0.93Si0.07 alloy to 252GPa: Implications for the Earth's inner core
journal, October 2011

Stability of the body-centred-cubic phase of iron in the Earth's inner core
journal, August 2003

Shear wave anisotropy of textured hcp-Fe in the Earth's inner core
journal, October 2010

CONUSS and PHOENIX: Evaluation of nuclear resonant scattering data
journal, March 2000

Six-reflection meV-monochromator for synchrotron radiation
journal, May 2011

Stability field of the hcp-structure for Fe, Fe-Ni, and Fe-Ni-Si alloys up to 3 Mbar: FE-NI-SI ALLOY UP TO 3 MBAR
journal, May 2011

Measuring velocity of sound with nuclear resonant inelastic x-ray scattering
journal, March 2003

Static compression of iron to 300 GPa and Fe _0.8 Ni _0.2 alloy to 260 GPa: Implications for composition of the core
journal, January 1990

Quasihydrostatic Equation of State of Iron above 2 Mbar
journal, November 2006

Composition and State of the Core
journal, May 2013

Pressure-Induced Magnetization in FeO: Evidence from Elasticity and Mössbauer Spectroscopy
journal, November 2004

Sound Velocities of Hot Dense Iron: Birch's Law Revisited
journal, June 2005

High Poisson's ratio of Earth's inner core explained by carbon alloying
journal, February 2015

Solubility of silicon in liquid metal at high pressure: implications for the composition of the Earth’s core
journal, January 2001

Preliminary reference Earth model
journal, June 1981

Sound velocity measurements in dhcp-FeH up to 70GPa with inelastic X-ray scattering: Implications for the composition of the Earth's core
journal, January 2012