Single-crystal equations of state of magnesiowüstite at high pressures

Finkelstein, Gregory J.; Jackson, Jennifer M.; Sturhahn, Wolfgang; Zhang, Dongzhou; Alp, E. Ercan; Toellner, Thomas S.

doi:10.2138/am-2017-5966

Title: Single-crystal equations of state of magnesiowüstite at high pressures

Abstract

Solid solutions of (Mg,Fe)O with high iron enrichment may be an important component of ultralow-velocity zones at Earth’s core-mantle boundary. However, to date there have been few high-precision studies on the elastic properties of these materials. In this study we present results on the compression of (Mg_0.22Fe_0.78)O magnesiowüstite in both neon and helium pressure media using single-crystal diffraction to ~55 GPa. In addition, our sample was characterized by time-domain synchrotron Mössbauer spectroscopy at ambient pressure using an extended time range that resulted in vastly improved energy resolution. The combination of these high-resolution techniques tightly constrains the presence of a defect-structure component at room pressure due to 4.7 mol% tetrahedrally-coordinated ferric iron, resulting in a renormalized composition of (Mg_0.215Fe_0.762⟂_0.023)O. Both high-pressure diffraction datasets are well described by a 3rd-order Birch-Murnaghan equation of state. The best fit-parameters for a crystal with cubic structure in helium are K_0T = 148(3) GPa, K'_0T = 4.09(12), and V₀ = 78.87(6) Å³. Increasing differential stress in the neon-containing sample chamber was correlated with increasing apparent distortion of the initially cubic unit cell, requiring a lower-symmetry hexagonal cell to fit the data above ~20 GPa. For fit equations of state, we determine the pressure-dependent correlation ellipses formore »« less

Authors:

Finkelstein, Gregory J. ^[1]; Jackson, Jennifer M. ^[1]; Sturhahn, Wolfgang ^[1]; Zhang, Dongzhou ^[2]; Alp, E. Ercan ^[3]; Toellner, Thomas S. ^[3]

California Inst. of Technology (CalTech), Pasadena, CA (United States)
Univ. of Hawaii, Honolulu, HI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Publication Date:: Tue Aug 01 00:00:00 EDT 2017

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

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1416148

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: American Mineralogist

Additional Journal Information:: Journal Volume: 102; Journal Issue: 8; Journal ID: ISSN 0003-004X

Publisher:: Mineralogical Society of America

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; magnesiowüstite; single-crystal diffraction; elasticity; equations of state; Mössbauer 19 spectroscopy; high pressure

Citation Formats


                    Finkelstein, Gregory J., Jackson, Jennifer M., Sturhahn, Wolfgang, Zhang, Dongzhou, Alp, E. Ercan, and Toellner, Thomas S. Single-crystal equations of state of magnesiowüstite at high pressures.  United States: N. p., 2017. 
Web.  doi:10.2138/am-2017-5966.

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                    Finkelstein, Gregory J., Jackson, Jennifer M., Sturhahn, Wolfgang, Zhang, Dongzhou, Alp, E. Ercan, & Toellner, Thomas S. Single-crystal equations of state of magnesiowüstite at high pressures.  United States.  https://doi.org/10.2138/am-2017-5966

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                    Finkelstein, Gregory J., Jackson, Jennifer M., Sturhahn, Wolfgang, Zhang, Dongzhou, Alp, E. Ercan, and Toellner, Thomas S. Tue .  
"Single-crystal equations of state of magnesiowüstite at high pressures".  United States.  https://doi.org/10.2138/am-2017-5966.  https://www.osti.gov/servlets/purl/1416148.

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@article{osti_1416148,

  title        = {Single-crystal equations of state of magnesiowüstite at high pressures},

  author       = {Finkelstein, Gregory J. and Jackson, Jennifer M. and Sturhahn, Wolfgang and Zhang, Dongzhou and Alp, E. Ercan and Toellner, Thomas S.},

  abstractNote = {Solid solutions of (Mg,Fe)O with high iron enrichment may be an important component of ultralow-velocity zones at Earth’s core-mantle boundary. However, to date there have been few high-precision studies on the elastic properties of these materials. In this study we present results on the compression of (Mg0.22Fe0.78)O magnesiowüstite in both neon and helium pressure media using single-crystal diffraction to ~55 GPa. In addition, our sample was characterized by time-domain synchrotron Mössbauer spectroscopy at ambient pressure using an extended time range that resulted in vastly improved energy resolution. The combination of these high-resolution techniques tightly constrains the presence of a defect-structure component at room pressure due to 4.7 mol% tetrahedrally-coordinated ferric iron, resulting in a renormalized composition of (Mg0.215Fe0.762⟂0.023)O. Both high-pressure diffraction datasets are well described by a 3rd-order Birch-Murnaghan equation of state. The best fit-parameters for a crystal with cubic structure in helium are K0T = 148(3) GPa, K'0T = 4.09(12), and V0 = 78.87(6) Å3. Increasing differential stress in the neon-containing sample chamber was correlated with increasing apparent distortion of the initially cubic unit cell, requiring a lower-symmetry hexagonal cell to fit the data above ~20 GPa. For fit equations of state, we determine the pressure-dependent correlation ellipses for the equation of state parameters and compare with previously published single-crystal diffraction data from (Mg,Fe)O crystals in a helium medium. We make two main observations from the datasets using a helium pressure medium: K0T decreases as a function of increasing iron content from periclase to wüstite and K'0T is consistent with an approximately constant value of 4.0 that is independent of iron content, at least up to (Mg,Fe)O containing ~78 mol% FeO. Finally, in combination with previously reported thermal parameters, we compute the density of Mw78 at core-mantle boundary conditions and discuss the implications.},

  doi          = {10.2138/am-2017-5966},

  journal      = {American Mineralogist},

  number       = 8,

  volume       = 102,

  place        = {United States},

  year         = {Tue Aug 01 00:00:00 EDT 2017},

  month        = {Tue Aug 01 00:00:00 EDT 2017}

}

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Works referenced in this record:

Fe–Mg Interdiffusion in (Mg,Fe)O
journal, August 2005

Mackwell, Stephen; Bystricky, Misha; Sproni, Caroline
Physics and Chemistry of Minerals, Vol. 32, Issue 5-6
DOI: 10.1007/s00269-005-0013-6

Isothermal compression behavior of (Mg,Fe)O using neon as a pressure medium
journal, December 2009

Zhuravlev, Kirill K.; Jackson, J. M.; Wolf, A. S.
Physics and Chemistry of Minerals, Vol. 37, Issue 7
DOI: 10.1007/s00269-009-0347-6

Absence of an aluminous phase in the upper part of the Earth's lower mantle
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Irifune, Tetsuo
Nature, Vol. 370, Issue 6485
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Erratum: Corrigendum: An early geodynamo driven by exsolution of mantle components from Earth’s core
journal, September 2016

Badro, James; Siebert, Julien; Nimmo, Francis
Nature, Vol. 539, Issue 7629
DOI: 10.1038/nature19808

Shear waves in the diamond-anvil cell reveal pressure-induced instability in (Mg,Fe)O
journal, April 2004

Jacobsen, S. D.; Spetzler, H.; Reichmann, H. J.
Proceedings of the National Academy of Sciences, Vol. 101, Issue 16
DOI: 10.1073/pnas.0401564101

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

Spin Transition Zone in Earth's Lower Mantle
journal, September 2007

Lin, J. -F.; Vanko, G.; Jacobsen, S. D.
Science, Vol. 317, Issue 5845
DOI: 10.1126/science.1144997

Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite
journal, November 2014

Tschauner, Oliver; Ma, Chi; Beckett, John R.
Science, Vol. 346, Issue 6213
DOI: 10.1126/science.1259369

A Correlation Between Ultra-Low Basal Velocities in the Mantle and Hot Spots
journal, July 1998

Williams, Q.
Science, Vol. 281, Issue 5376
DOI: 10.1126/science.281.5376.546

Phase transitions and equation of state of forsterite to 90 GPa from single-crystal X-ray diffraction and molecular modeling
journal, January 2014

Finkelstein, G. J.; Dera, P. K.; Jahn, S.
American Mineralogist, Vol. 99, Issue 1
DOI: 10.2138/am.2014.4526

Works referencing / citing this record:

Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle
journal, June 2018

Finkelstein, Gregory J.; Jackson, Jennifer M.; Said, Ayman
Journal of Geophysical Research: Solid Earth, Vol. 123, Issue 6
DOI: 10.1029/2017jb015349

Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones
journal, December 2019

Dobrosavljevic, Vasilije V.; Sturhahn, Wolfgang; Jackson, Jennifer M.
Minerals, Vol. 9, Issue 12
DOI: 10.3390/min9120762

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Title: Single-crystal equations of state of magnesiowüstite at high pressures

Abstract

Citation Formats

Fe–Mg Interdiffusion in (Mg,Fe)O journal, August 2005

Isothermal compression behavior of (Mg,Fe)O using neon as a pressure medium journal, December 2009

Absence of an aluminous phase in the upper part of the Earth's lower mantle journal, July 1994

Erratum: Corrigendum: An early geodynamo driven by exsolution of mantle components from Earth’s core journal, September 2016

Shear waves in the diamond-anvil cell reveal pressure-induced instability in (Mg,Fe)O journal, April 2004

Hydrostatic limits of 11 pressure transmitting media journal, March 2009

Spin Transition Zone in Earth's Lower Mantle journal, September 2007

Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite journal, November 2014

A Correlation Between Ultra-Low Basal Velocities in the Mantle and Hot Spots journal, July 1998

Phase transitions and equation of state of forsterite to 90 GPa from single-crystal X-ray diffraction and molecular modeling journal, January 2014

Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle journal, June 2018

Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones journal, December 2019

Fe–Mg Interdiffusion in (Mg,Fe)O
journal, August 2005

Isothermal compression behavior of (Mg,Fe)O using neon as a pressure medium
journal, December 2009

Absence of an aluminous phase in the upper part of the Earth's lower mantle
journal, July 1994

Erratum: Corrigendum: An early geodynamo driven by exsolution of mantle components from Earth’s core
journal, September 2016

Shear waves in the diamond-anvil cell reveal pressure-induced instability in (Mg,Fe)O
journal, April 2004

Hydrostatic limits of 11 pressure transmitting media
journal, March 2009

Spin Transition Zone in Earth's Lower Mantle
journal, September 2007

Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite
journal, November 2014

A Correlation Between Ultra-Low Basal Velocities in the Mantle and Hot Spots
journal, July 1998

Phase transitions and equation of state of forsterite to 90 GPa from single-crystal X-ray diffraction and molecular modeling
journal, January 2014

Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle
journal, June 2018

Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones
journal, December 2019