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

研究成果: Article査読

23 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)77-82
ページ数6
ジャーナルPhysics of the Earth and Planetary Interiors
224
DOI
出版ステータスPublished - 2013 11

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 地球物理学
  • 物理学および天文学(その他)
  • 宇宙惑星科学

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