Compression of Fe88.1Ni9.1S2.8 alloy up to the pressure of Earth's inner core

Takeshi Sakai; Eiji Ohtani; Seiji Kamada; Hidenori Terasaki; Naohisa Hirao

doi:10.1029/2011JB008745

Compression of Fe_88.1Ni_9.1S_2.8 alloy up to the pressure of Earth's inner core

Takeshi Sakai, Eiji Ohtani, Seiji Kamada, Hidenori Terasaki, Naohisa Hirao

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

16 Citations (Scopus)

Abstract

Fe_88.1Ni_9.1S_2.8 alloy was compressed up to 335GPa, corresponding to the pressure at the Earth's inner core, and the hexagonal close-packed structure was found to be stable. The axial (c/a) ratio gradually decreased with increasing pressure. A linear fit as a function of pressure gave c/a = 1.605(2)-6.1(9) × 10^-5P for P in GPa. The compression curve of Fe_88.1Ni_9.1S_2.8 alloy was expressed by the third-order Birch-Murnaghan equation of state, giving K ₀ = 167.0 15.0GPa, K₀ = 4.46±0.14, and V ₀ = 22.93±0.29 Å³. Our results indicate that the hcp Fe-5 wt % Ni-5.7 wt % S alloy can account for the density of the inner core at 328.9GPa, assuming a linear relationship exists between the density and the nickel and sulfur content.

Original language	English
Article number	B02210
Journal	Journal of Geophysical Research: Solid Earth
Volume	117
Issue number	2
DOIs	https://doi.org/10.1029/2011JB008745
Publication status	Published - Feb 1 2012
Externally published	Yes

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

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10.1029/2011JB008745

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title = "Compression of Fe88.1Ni9.1S2.8 alloy up to the pressure of Earth's inner core",

abstract = "Fe88.1Ni9.1S2.8 alloy was compressed up to 335GPa, corresponding to the pressure at the Earth's inner core, and the hexagonal close-packed structure was found to be stable. The axial (c/a) ratio gradually decreased with increasing pressure. A linear fit as a function of pressure gave c/a = 1.605(2)-6.1(9) × 10-5P for P in GPa. The compression curve of Fe88.1Ni9.1S2.8 alloy was expressed by the third-order Birch-Murnaghan equation of state, giving K 0 = 167.0 15.0GPa, K0 = 4.46±0.14, and V 0 = 22.93±0.29 {\AA}3. Our results indicate that the hcp Fe-5 wt % Ni-5.7 wt % S alloy can account for the density of the inner core at 328.9GPa, assuming a linear relationship exists between the density and the nickel and sulfur content.",

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AU - Sakai, Takeshi

AU - Ohtani, Eiji

AU - Kamada, Seiji

AU - Terasaki, Hidenori

AU - Hirao, Naohisa

PY - 2012/2/1

Y1 - 2012/2/1

N2 - Fe88.1Ni9.1S2.8 alloy was compressed up to 335GPa, corresponding to the pressure at the Earth's inner core, and the hexagonal close-packed structure was found to be stable. The axial (c/a) ratio gradually decreased with increasing pressure. A linear fit as a function of pressure gave c/a = 1.605(2)-6.1(9) × 10-5P for P in GPa. The compression curve of Fe88.1Ni9.1S2.8 alloy was expressed by the third-order Birch-Murnaghan equation of state, giving K 0 = 167.0 15.0GPa, K0 = 4.46±0.14, and V 0 = 22.93±0.29 Å3. Our results indicate that the hcp Fe-5 wt % Ni-5.7 wt % S alloy can account for the density of the inner core at 328.9GPa, assuming a linear relationship exists between the density and the nickel and sulfur content.

AB - Fe88.1Ni9.1S2.8 alloy was compressed up to 335GPa, corresponding to the pressure at the Earth's inner core, and the hexagonal close-packed structure was found to be stable. The axial (c/a) ratio gradually decreased with increasing pressure. A linear fit as a function of pressure gave c/a = 1.605(2)-6.1(9) × 10-5P for P in GPa. The compression curve of Fe88.1Ni9.1S2.8 alloy was expressed by the third-order Birch-Murnaghan equation of state, giving K 0 = 167.0 15.0GPa, K0 = 4.46±0.14, and V 0 = 22.93±0.29 Å3. Our results indicate that the hcp Fe-5 wt % Ni-5.7 wt % S alloy can account for the density of the inner core at 328.9GPa, assuming a linear relationship exists between the density and the nickel and sulfur content.

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Compression of Fe_88.1Ni_9.1S_2.8 alloy up to the pressure of Earth's inner core

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