Pressure-induced magnetic transition and sound velocities of Fe3C: Implications for carbon in the Earth's inner core

Lili Gao; Bin Chen; Jingyun Wang; Esen E. Alp; Jiyong Zhao; Michael Lerche; Wolfgang Sturhahn; Henry P. Scott; Fang Huang; Yang Ding; Stanislav V. Sinogeikin; Craig C. Lundstrom; Jay D. Bass; Jie Li

doi:10.1029/2008GL034817

Pressure-induced magnetic transition and sound velocities of Fe₃C: Implications for carbon in the Earth's inner core

Lili Gao, Bin Chen, Jingyun Wang, Esen E. Alp, Jiyong Zhao, Michael Lerche, Wolfgang Sturhahn, Henry P. Scott, Fang Huang, Yang Ding, Stanislav V. Sinogeikin, Craig C. Lundstrom, Jay D. Bass, Jie Li

Research output: Contribution to journal › Article › peer-review

Abstract

We have carried out nuclear resonant scattering measurements on ⁵⁷Fe-enriched Fe₃C between 1 bar and 50 GPa at 300 K. Synchrotron Mössbauer spectra reveal a pressure-induced magnetic transition in Fe₃C between 4.3 and 6.5 GPa. On the basis of our nuclear resonant inelastic X-ray scattering spectra and existing equation-of-state data, we have derived the compressional wave velocity V_P and shear wave velocity V_S for the high-pressure nonmagnetic phase, which can be expressed as functions of density (ρ): V_P(km/s) = -3.99 + 1.29ρ(g/ cm³) and V_S(km/s) = 1.45 + 0.24ρ(g/cm³). The addition of carbon to iron-nickel alloy brings density, V_P and V_S closer to seismic observations, supporting carbon as a principal light element in the Earth's inner core.

Original language	English (US)
Article number	L17306
Journal	Geophysical Research Letters
Volume	35
Issue number	17
DOIs	https://doi.org/10.1029/2008GL034817
State	Published - Sep 16 2008

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/2008GL034817

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Gao, L., Chen, B., Wang, J., Alp, E. E., Zhao, J., Lerche, M., Sturhahn, W., Scott, H. P., Huang, F., Ding, Y., Sinogeikin, S. V., Lundstrom, C. C., Bass, J. D., & Li, J. (2008). Pressure-induced magnetic transition and sound velocities of Fe₃C: Implications for carbon in the Earth's inner core. Geophysical Research Letters, 35(17), Article L17306. https://doi.org/10.1029/2008GL034817

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title = "Pressure-induced magnetic transition and sound velocities of Fe3C: Implications for carbon in the Earth's inner core",

abstract = "We have carried out nuclear resonant scattering measurements on 57Fe-enriched Fe3C between 1 bar and 50 GPa at 300 K. Synchrotron M{\"o}ssbauer spectra reveal a pressure-induced magnetic transition in Fe3C between 4.3 and 6.5 GPa. On the basis of our nuclear resonant inelastic X-ray scattering spectra and existing equation-of-state data, we have derived the compressional wave velocity VP and shear wave velocity VS for the high-pressure nonmagnetic phase, which can be expressed as functions of density (ρ): VP(km/s) = -3.99 + 1.29ρ(g/ cm3) and VS(km/s) = 1.45 + 0.24ρ(g/cm3). The addition of carbon to iron-nickel alloy brings density, VP and VS closer to seismic observations, supporting carbon as a principal light element in the Earth's inner core.",

author = "Lili Gao and Bin Chen and Jingyun Wang and Alp, {Esen E.} and Jiyong Zhao and Michael Lerche and Wolfgang Sturhahn and Scott, {Henry P.} and Fang Huang and Yang Ding and Sinogeikin, {Stanislav V.} and Lundstrom, {Craig C.} and Bass, {Jay D.} and Jie Li",

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doi = "10.1029/2008GL034817",

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T1 - Pressure-induced magnetic transition and sound velocities of Fe3C

T2 - Implications for carbon in the Earth's inner core

AU - Gao, Lili

AU - Chen, Bin

AU - Wang, Jingyun

AU - Alp, Esen E.

AU - Zhao, Jiyong

AU - Lerche, Michael

AU - Sturhahn, Wolfgang

AU - Scott, Henry P.

AU - Huang, Fang

AU - Ding, Yang

AU - Sinogeikin, Stanislav V.

AU - Lundstrom, Craig C.

AU - Bass, Jay D.

AU - Li, Jie

PY - 2008/9/16

Y1 - 2008/9/16

N2 - We have carried out nuclear resonant scattering measurements on 57Fe-enriched Fe3C between 1 bar and 50 GPa at 300 K. Synchrotron Mössbauer spectra reveal a pressure-induced magnetic transition in Fe3C between 4.3 and 6.5 GPa. On the basis of our nuclear resonant inelastic X-ray scattering spectra and existing equation-of-state data, we have derived the compressional wave velocity VP and shear wave velocity VS for the high-pressure nonmagnetic phase, which can be expressed as functions of density (ρ): VP(km/s) = -3.99 + 1.29ρ(g/ cm3) and VS(km/s) = 1.45 + 0.24ρ(g/cm3). The addition of carbon to iron-nickel alloy brings density, VP and VS closer to seismic observations, supporting carbon as a principal light element in the Earth's inner core.

AB - We have carried out nuclear resonant scattering measurements on 57Fe-enriched Fe3C between 1 bar and 50 GPa at 300 K. Synchrotron Mössbauer spectra reveal a pressure-induced magnetic transition in Fe3C between 4.3 and 6.5 GPa. On the basis of our nuclear resonant inelastic X-ray scattering spectra and existing equation-of-state data, we have derived the compressional wave velocity VP and shear wave velocity VS for the high-pressure nonmagnetic phase, which can be expressed as functions of density (ρ): VP(km/s) = -3.99 + 1.29ρ(g/ cm3) and VS(km/s) = 1.45 + 0.24ρ(g/cm3). The addition of carbon to iron-nickel alloy brings density, VP and VS closer to seismic observations, supporting carbon as a principal light element in the Earth's inner core.

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