Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 9 December 1994:
Vol. 266. no. 5191, pp. 1678 - 1680
DOI: 10.1126/science.266.5191.1678
Prev | Table of Contents | Next

Articles

In Situ Determination of the NiAs Phase of FeO at High Pressure and Temperature

Yingwei Fei 1 and Ho-kwang Mao 1

1 Geophysical Laboratory and Center for High-Pressure Research, 5251 Broad Branch Road, N. W., Washington, DC 20015, USA.

In situ synchrotron x-ray diffraction measurements of FeO at high pressures and high temperatures revealed that the high-pressure phase of FeO has the NiAs structure (B8). The lattice parameters of this NiAs phase at 96 gigapascals and 800 kelvin are a = 2.574(2) angstroms and c = 5.172(4) angstroms (the number in parentheses is the error in the last digit). Metallic behavior of the high-pressure phase is consistent with a covalently and metallically bonded NiAs structure of FeO. Transition to the NiAs structure of FeO would enhance oxygen solubility in molten iron. This transition thus provides a physiochemical basis for the incorporation of oxygen into the Earth's core.

Submitted on September 7, 1994
Accepted on November 1, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Stability of magnesiowustite in Earth's lower mantle.
J.-F. Lin, D. L. Heinz, H.-k. Mao, R. J. Hemley, J. M. Devine, J. Li, and G. Shen (2003)
PNAS 100, 4405-4408
   Abstract »    Full Text »    PDF »
Structure, metal-insulator transitions, and magnetic properties of FeO at high pressures.
S. A. Gramsch, S. A. Gramsch, R. E. Cohen, and S. Y. Savrasov (2003)
American Mineralogist 88, 257-261
   Abstract »    Full Text »    PDF »
The strength of moissanite.
J. Zhang, L. Wang, D. J. Weidner, T. Uchida, and J.-A. Xu (2002)
American Mineralogist 87, 1005-1008
   Abstract »    Full Text »    PDF »
Stability of (Mg0.5Fe0.5)O and (Mg0.8Fe0.2)O magnesiowustites in the lower mantle.
L. DUBROVINSKY, N. DUBROVINSKAIA, H. ANNERSTEN, E. HALENIUS, and H. HARRYSON (2001)
European Journal of Mineralogy 13, 857-861
   Abstract »    Full Text »    PDF »
Moissanite: A Window for High-Pressure Experiments.
J.-a. Xu and H.-k. Mao (2000)
Science 290, 783-785
   Abstract »    Full Text »
Stability of Ferropericlase in the Lower Mantle.
L. S. Dubrovinsky, N. A. Dubrovinskaia, S. K. Saxena, H. Annersten, E. Hålenius, H. Harryson, F. Tutti, S. Rekhi, and T. L. Bihan (2000)
Science 289, 430-432
   Abstract »    Full Text »
Pressure-induced transformations in deep mantle and core minerals.
R. J. Hemley, H. K. Mao, and S. A. Gramsch (2000)
Mineralogical Magazine 64, 157-184
   Abstract »    Full Text »    PDF »
Equation of state of magnetite and its high-pressure modification: Thermodynamics of the Fe-O system at high pressure.
C. Haavik, S. Stolen, H. Fjellvag, M. Hanfland, and D. Hausermann (2000)
American Mineralogist 85, 514-523
   Abstract »    Full Text »    PDF »
Phase Diagram of Iron by in Situ X-ray Diffraction: Implications for Earth's Core.
C. S. Yoo, J. Akella, A. J. Campbell, H. K. Mao, and R. J. Hemley (1995)
Science 270, 1473-1475
   Abstract »    PDF »
Structure and Density of FeS at High Pressure and High Temperature and the Internal Structure of Mars.
Y. Fei, Y. Fei, C. T. Prewitt, H.-k. Mao, and C. M. Bertka (1995)
Science 268, 1892-1894
   Abstract »    PDF »
What Is in the Earth's Core Besides Iron?.
W. A. Bassett and W. A. Bassett (1994)
Science 266, 1662-1663
   PDF »


ADVERTISEMENT
Click Me!

ADVERTISEMENT
Click Me!

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)