Equation of State and Spin Crossover of (Al, Fe)–Phase H
Abstract
The transport of hydrogen into Earth's deep interior may have an impact on lower mantle dynamics as well as on the seismic signature of subducted material. Due to the stability of the hydrous phases δ-AlOOH (delta phase), MgSiO2(OH)2 (phase H), and ε-FeOOH at high temperatures and pressures, their solid solutions may transport significant amounts of hydrogen as deep as the core-mantle boundary. Here we have constrained the equation of state, including the effects of a spin crossover in the Fe3+ atoms, of (Al, Fe)-phase H: Al0.84Fe3+ 0.07Mg0.02Si0.06OOH, using powder X-ray diffraction measurements to 125 GPa, supported by synchrotron Mössbauer spectroscopy measurements on (Al, Fe)-phase H and δ-(Al, Fe)OOH. The changes in spin state of Fe3+ in (Al, Fe)-phase H results in a significant decrease in bulk sound velocity and occurs over a different pressure range (48–62 GPa) compared with δ-(Al, Fe)OOH (32–40 GPa). Changes in axial compressibilities indicate a decrease in the compressibility of hydrogen bonds in (Al, Fe)-phase H near 30 GPa, which may be associated with hydrogen bond symmetrization. The formation of (Al, Fe)-phase H in subducted oceanic crust may contribute to scattering of seismic waves in the mid-lower mantle (~1,100–1,550 km). Accumulation of 1–4 wt.% (Al, Fe)-phasemore »
- Authors:
-
[1];
[2];
[1];
[3];
[4];
[6];
[1]
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- California Institute of Technology (CalTech), Pasadena, CA (United States); Univ. of Oxford (United Kingdom)
- Univ. of Bayreuth (Germany); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing (China)
- Gakushuin University, Tokyo (Japan)
- Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
- Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
- OSTI Identifier:
- 2228906
- Grant/Contract Number:
- AC02-06CH11357; EAR-2009935; EAR-1661511; EAR-1634415; FG02-94ER14466; EAR-1606856
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 128; Journal Issue: 4; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
Strozewski, Benjamin, Buchen, Johannes, Sturhahn, Wolfgang, Ishii, Takayuki, Ohira, Itaru, Chariton, Stella, Lavina, Barbara, Zhao, Jiyong, Toellner, Thomas S., and Jackson, Jennifer M. Equation of State and Spin Crossover of (Al, Fe)–Phase H. United States: N. p., 2023.
Web. doi:10.1029/2022jb026291.
Strozewski, Benjamin, Buchen, Johannes, Sturhahn, Wolfgang, Ishii, Takayuki, Ohira, Itaru, Chariton, Stella, Lavina, Barbara, Zhao, Jiyong, Toellner, Thomas S., & Jackson, Jennifer M. Equation of State and Spin Crossover of (Al, Fe)–Phase H. United States. https://doi.org/10.1029/2022jb026291
Strozewski, Benjamin, Buchen, Johannes, Sturhahn, Wolfgang, Ishii, Takayuki, Ohira, Itaru, Chariton, Stella, Lavina, Barbara, Zhao, Jiyong, Toellner, Thomas S., and Jackson, Jennifer M. Sat .
"Equation of State and Spin Crossover of (Al, Fe)–Phase H". United States. https://doi.org/10.1029/2022jb026291. https://www.osti.gov/servlets/purl/2228906.
@article{osti_2228906,
title = {Equation of State and Spin Crossover of (Al, Fe)–Phase H},
author = {Strozewski, Benjamin and Buchen, Johannes and Sturhahn, Wolfgang and Ishii, Takayuki and Ohira, Itaru and Chariton, Stella and Lavina, Barbara and Zhao, Jiyong and Toellner, Thomas S. and Jackson, Jennifer M.},
abstractNote = {The transport of hydrogen into Earth's deep interior may have an impact on lower mantle dynamics as well as on the seismic signature of subducted material. Due to the stability of the hydrous phases δ-AlOOH (delta phase), MgSiO2(OH)2 (phase H), and ε-FeOOH at high temperatures and pressures, their solid solutions may transport significant amounts of hydrogen as deep as the core-mantle boundary. Here we have constrained the equation of state, including the effects of a spin crossover in the Fe3+ atoms, of (Al, Fe)-phase H: Al0.84Fe3+ 0.07Mg0.02Si0.06OOH, using powder X-ray diffraction measurements to 125 GPa, supported by synchrotron Mössbauer spectroscopy measurements on (Al, Fe)-phase H and δ-(Al, Fe)OOH. The changes in spin state of Fe3+ in (Al, Fe)-phase H results in a significant decrease in bulk sound velocity and occurs over a different pressure range (48–62 GPa) compared with δ-(Al, Fe)OOH (32–40 GPa). Changes in axial compressibilities indicate a decrease in the compressibility of hydrogen bonds in (Al, Fe)-phase H near 30 GPa, which may be associated with hydrogen bond symmetrization. The formation of (Al, Fe)-phase H in subducted oceanic crust may contribute to scattering of seismic waves in the mid-lower mantle (~1,100–1,550 km). Accumulation of 1–4 wt.% (Al, Fe)-phase H could reproduce some of the seismic signatures of large, low seismic-velocity provinces. Our results suggest that changes in the electronic structure of phases in the (δ-AlOOH)-(MgSiO2(OH)2)-(ε-FeOOH) solid solution are sensitive to composition and that the presence of these phases in subducted oceanic crust could be seismically detectable throughout the lower mantle.},
doi = {10.1029/2022jb026291},
journal = {Journal of Geophysical Research. Solid Earth},
number = 4,
volume = 128,
place = {United States},
year = {Sat Mar 25 00:00:00 EDT 2023},
month = {Sat Mar 25 00:00:00 EDT 2023}
}
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