Elastic softening in Fe7C3 with implications for Earth's deep carbon reservoirs
Abstract
Iron carbide Fe7C3 has recently emerged as a potential host of reduced carbon in Earth's mantle and a candidate component of the inner core, but the equation of state of Fe7C3 is still uncertain, partly because the nature of pressure–induced magnetic transitions in Fe7C3 and their elastic effects remain controversial. Here we report the compression curve of hexagonal Fe7C3 in neon medium with dense pressure sampling and in comparison with pure iron in the same loading. Here, the results revealed elastic softening between 7 GPa and 20 GPa, which can be attributed to noncollinear alignment of spin moments in a state between the ferromagnetic and paramagnetic phases, as expected for Invar–type alloys. The volume reduction associated with the softening would enhance the stability of Fe7C3 in the deeper part of the upper mantle and transition zone. As a result of subsequent spin crossover at higher pressures, Fe7C3 at inner core conditions likely occurs as the nonmagnetic phase, which remains a candidate for the major component of the Earth's central sphere.
- Authors:
-
- Univ. of Michigan, Ann Arbor, MI (United States)
- Carnegie Inst. of Washington, Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); Sloan Foundation Deep Carbon Observatory
- OSTI Identifier:
- 1248403
- Grant/Contract Number:
- AST 1344133; EAR 1219891; NNX10AG97G; NNX15AG54G; G‐2015‐14085
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 3; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES; iron carbide; elastic softening; equation of state; magnetic transitions; Invar behavior; deep carbon reservoirs
Citation Formats
Liu, Jiachao, Li, Jie, and Ikuta, Daijo. Elastic softening in Fe7C3 with implications for Earth's deep carbon reservoirs. United States: N. p., 2016.
Web. doi:10.1002/2015JB012701.
Liu, Jiachao, Li, Jie, & Ikuta, Daijo. Elastic softening in Fe7C3 with implications for Earth's deep carbon reservoirs. United States. https://doi.org/10.1002/2015JB012701
Liu, Jiachao, Li, Jie, and Ikuta, Daijo. Fri .
"Elastic softening in Fe7C3 with implications for Earth's deep carbon reservoirs". United States. https://doi.org/10.1002/2015JB012701. https://www.osti.gov/servlets/purl/1248403.
@article{osti_1248403,
title = {Elastic softening in Fe7C3 with implications for Earth's deep carbon reservoirs},
author = {Liu, Jiachao and Li, Jie and Ikuta, Daijo},
abstractNote = {Iron carbide Fe7C3 has recently emerged as a potential host of reduced carbon in Earth's mantle and a candidate component of the inner core, but the equation of state of Fe7C3 is still uncertain, partly because the nature of pressure–induced magnetic transitions in Fe7C3 and their elastic effects remain controversial. Here we report the compression curve of hexagonal Fe7C3 in neon medium with dense pressure sampling and in comparison with pure iron in the same loading. Here, the results revealed elastic softening between 7 GPa and 20 GPa, which can be attributed to noncollinear alignment of spin moments in a state between the ferromagnetic and paramagnetic phases, as expected for Invar–type alloys. The volume reduction associated with the softening would enhance the stability of Fe7C3 in the deeper part of the upper mantle and transition zone. As a result of subsequent spin crossover at higher pressures, Fe7C3 at inner core conditions likely occurs as the nonmagnetic phase, which remains a candidate for the major component of the Earth's central sphere.},
doi = {10.1002/2015JB012701},
journal = {Journal of Geophysical Research. Solid Earth},
number = 3,
volume = 121,
place = {United States},
year = {Fri Feb 26 00:00:00 EST 2016},
month = {Fri Feb 26 00:00:00 EST 2016}
}
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Works referencing / citing this record:
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