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Science 18 February 2000:
Vol. 287. no. 5456, pp. 1250 - 1253
DOI: 10.1126/science.287.5456.1250
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Reports
Density of Phonon States in Iron at High Pressure
R. Lübbers,
1
H. F. Grünsteudel,
2
A. I. Chumakov,
2
G. Wortmann
1*
The lattice dynamics of the hexagonal close-packed (hcp) phase of
iron was studied with nuclear inelastic absorption of synchrotron radiation at pressures from 20 to 42 gigapascals. A variety of thermodynamic parameters were derived from the measured density of
phonon states for hcp iron, such as Debye temperatures, Grüneisen parameter, mean sound velocities, and the lattice contribution to
entropy and specific heat. The results are of geophysical interest, because hcp iron is considered to be a major component of Earth's inner core.
1 Fachbereich Physik, University of
Paderborn, D-33095 Paderborn, Germany.
2 European
Synchrotron Radiation Facility, Boite Postal 220, F-38043 Grenoble,
France.
*
To whom correspondence should be addressed. E-mail:
wo_gw{at}physik.uni-paderborn.de
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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- Aggregate sound velocities and acoustic Gruneisen parameter of iron up to 300 GPa and 1,200 K.
- L. S. Dubrovinsky, N. A. Dubrovinskaia, and T. Le Bihan (2001)
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- Phonon Density of States of Iron up to 153 Gigapascals.
- H. K. Mao, J. Xu, V. V. Struzhkin, J. Shu, R. J. Hemley, W. Sturhahn, M. Y. Hu, E. E. Alp, L. Vocadlo, D. Alfe, et al. (2001)
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- Sound Velocities in Iron to 110 Gigapascals.
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291, 468-471
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- Raman Spectroscopy of Iron to 152 Gigapascals: Implications for Earth's Inner Core.
- S. Merkel, A. F. Goncharov, H. Mao, P. Gillet, and R. J. Hemley (2000)
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288, 1626-1629
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