Density of Fe-3.5wt% C liquid at high pressure and temperature and the effect of carbon on the density of the molten iron

Yuta Shimoyama; Hidenori Terasaki; Eiji Ohtani; Satoru Urakawa; Yusaku Takubo; Keisuke Nishida; Akio Suzuki; Yoshinori Katayama

doi:10.1016/j.pepi.2013.08.003

Density of Fe-3.5wt% C liquid at high pressure and temperature and the effect of carbon on the density of the molten iron

Yuta Shimoyama, Hidenori Terasaki, Eiji Ohtani, Satoru Urakawa, Yusaku Takubo, Keisuke Nishida, Akio Suzuki, Yoshinori Katayama

School of Science

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

31 Citations (Scopus)

Abstract

Carbon is a plausible light element candidate in the Earth's outer core. We measured the density of liquid Fe-3.5wt% C up to 6.8GPa and 2200K using an X-ray absorption method. The compression curve of liquid Fe-C was fitted using the third-order Birch-Murnaghan equation of state. The bulk modulus and its pressure derivative are K_0,1500K=55.3±2.5GPa and (dK₀/dP)_T=5.2±1.5, and the thermal expansion coefficient is α=0.86±0.04×10^-4K^-1. The Fe-C density abruptly increases at pressures between 4.3 and 5.5GPa in the range of present temperatures. Compared with the results of previous density measurements of liquid Fe-C, the effect of carbon on the density of liquid Fe shows a nonideal mixing behavior. The abrupt density increase and nonideal mixing behavior are important factors in determining the light element content in the Earth's core.

Original language	English
Pages (from-to)	77-82
Number of pages	6
Journal	Physics of the Earth and Planetary Interiors
Volume	224
DOIs	https://doi.org/10.1016/j.pepi.2013.08.003
Publication status	Published - Nov 2013

Keywords

Core
Density
Fe alloy liquid
High pressure

ASJC Scopus subject areas

Astronomy and Astrophysics
Geophysics
Physics and Astronomy (miscellaneous)
Space and Planetary Science

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10.1016/j.pepi.2013.08.003

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title = "Density of Fe-3.5wt% C liquid at high pressure and temperature and the effect of carbon on the density of the molten iron",

abstract = "Carbon is a plausible light element candidate in the Earth's outer core. We measured the density of liquid Fe-3.5wt% C up to 6.8GPa and 2200K using an X-ray absorption method. The compression curve of liquid Fe-C was fitted using the third-order Birch-Murnaghan equation of state. The bulk modulus and its pressure derivative are K0,1500K=55.3±2.5GPa and (dK0/dP)T=5.2±1.5, and the thermal expansion coefficient is α=0.86±0.04×10-4K-1. The Fe-C density abruptly increases at pressures between 4.3 and 5.5GPa in the range of present temperatures. Compared with the results of previous density measurements of liquid Fe-C, the effect of carbon on the density of liquid Fe shows a nonideal mixing behavior. The abrupt density increase and nonideal mixing behavior are important factors in determining the light element content in the Earth's core.",

keywords = "Core, Density, Fe alloy liquid, High pressure",

author = "Yuta Shimoyama and Hidenori Terasaki and Eiji Ohtani and Satoru Urakawa and Yusaku Takubo and Keisuke Nishida and Akio Suzuki and Yoshinori Katayama",

note = "Funding Information: The authors acknowledge T. Sakamaki, S. Takahashi, R. Kamuro, S. Kishimoto, S. Kuwabara and H. Saito for fruitful discussions and technical assistance. This work was supported by a Grant-in-Aid for Scientific Research of the Ministry of Education, Culture, Science, Sport and Technology of the Japanese Government (No. 22000002) to E.O. (No. 23340159) to H.T. and conducted as a part of the Global COE Program at Tohoku University, {\textquoteleft}Global Education and Research Center for Earth and Planetary Dynamics{\textquoteright}. The synchrotron radiation experiments were performed at the BL22XU line of the JAEA SPring-8 facility under the Common-Use Facility Program of JAEA (Proposal nos 2011A-E12, 2011B-E08 and 2012B-E15).",

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month = nov,

doi = "10.1016/j.pepi.2013.08.003",

language = "English",

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pages = "77--82",

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T1 - Density of Fe-3.5wt% C liquid at high pressure and temperature and the effect of carbon on the density of the molten iron

AU - Shimoyama, Yuta

AU - Terasaki, Hidenori

AU - Ohtani, Eiji

AU - Urakawa, Satoru

AU - Takubo, Yusaku

AU - Nishida, Keisuke

AU - Suzuki, Akio

AU - Katayama, Yoshinori

N1 - Funding Information: The authors acknowledge T. Sakamaki, S. Takahashi, R. Kamuro, S. Kishimoto, S. Kuwabara and H. Saito for fruitful discussions and technical assistance. This work was supported by a Grant-in-Aid for Scientific Research of the Ministry of Education, Culture, Science, Sport and Technology of the Japanese Government (No. 22000002) to E.O. (No. 23340159) to H.T. and conducted as a part of the Global COE Program at Tohoku University, ‘Global Education and Research Center for Earth and Planetary Dynamics’. The synchrotron radiation experiments were performed at the BL22XU line of the JAEA SPring-8 facility under the Common-Use Facility Program of JAEA (Proposal nos 2011A-E12, 2011B-E08 and 2012B-E15).

PY - 2013/11

Y1 - 2013/11

N2 - Carbon is a plausible light element candidate in the Earth's outer core. We measured the density of liquid Fe-3.5wt% C up to 6.8GPa and 2200K using an X-ray absorption method. The compression curve of liquid Fe-C was fitted using the third-order Birch-Murnaghan equation of state. The bulk modulus and its pressure derivative are K0,1500K=55.3±2.5GPa and (dK0/dP)T=5.2±1.5, and the thermal expansion coefficient is α=0.86±0.04×10-4K-1. The Fe-C density abruptly increases at pressures between 4.3 and 5.5GPa in the range of present temperatures. Compared with the results of previous density measurements of liquid Fe-C, the effect of carbon on the density of liquid Fe shows a nonideal mixing behavior. The abrupt density increase and nonideal mixing behavior are important factors in determining the light element content in the Earth's core.

AB - Carbon is a plausible light element candidate in the Earth's outer core. We measured the density of liquid Fe-3.5wt% C up to 6.8GPa and 2200K using an X-ray absorption method. The compression curve of liquid Fe-C was fitted using the third-order Birch-Murnaghan equation of state. The bulk modulus and its pressure derivative are K0,1500K=55.3±2.5GPa and (dK0/dP)T=5.2±1.5, and the thermal expansion coefficient is α=0.86±0.04×10-4K-1. The Fe-C density abruptly increases at pressures between 4.3 and 5.5GPa in the range of present temperatures. Compared with the results of previous density measurements of liquid Fe-C, the effect of carbon on the density of liquid Fe shows a nonideal mixing behavior. The abrupt density increase and nonideal mixing behavior are important factors in determining the light element content in the Earth's core.

KW - Core

KW - Density

KW - Fe alloy liquid

KW - High pressure

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DO - 10.1016/j.pepi.2013.08.003

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SN - 0031-9201

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SP - 77

EP - 82

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

ER -

Density of Fe-3.5wt% C liquid at high pressure and temperature and the effect of carbon on the density of the molten iron

Abstract

Keywords

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