Journal
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
Volume 224, Issue -, Pages 77-82Publisher
ELSEVIER
DOI: 10.1016/j.pepi.2013.08.003
Keywords
Density; Fe alloy liquid; Core; High pressure
Categories
Funding
- Ministry of Education, Culture, Science, Sport and Technology of the Japanese Government [22000002, 23340159]
- Global COE Program at Tohoku University, 'Global Education and Research Center for Earth and Planetary Dynamics'
- Common-Use Facility Program of JAEA [2011A-E12, 2011B-E08, 2012B-E15]
- Grants-in-Aid for Scientific Research [23340159, 25610153] Funding Source: KAKEN
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available