2013年11月
Density of Fe-3.5 wt% C liquid at high pressure and temperature and the effect of carbon on the density of the molten iron
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
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- 巻
- 224
- 号
- 開始ページ
- 77
- 終了ページ
- 82
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.pepi.2013.08.003
- 出版者・発行元
- ELSEVIER
Carbon is a plausible light element candidate in the Earth's outer core. We measured the density of liquid Fe-3.5 wt% C up to 6.8 GPa and 2200 K 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 +/- 2.5 GPa and (dK(o)/dP)(T) = 5.2 +/- 1.5, and the thermal expansion coefficient is alpha = 0.86 +/- 0.04 x 10(-4) K-1. The Fe-C density abruptly increases at pressures between 4.3 and 5.5 GPa 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. (C) 2013 Elsevier B.V. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.pepi.2013.08.003
- ISSN : 0031-9201
- eISSN : 1872-7395
- Web of Science ID : WOS:000327232200007