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High-Pressure Geoscience Special Feature
HIGH-PRESSURE GEOSCIENCE SPECIAL FEATURE / PHYSICAL SCIENCES / RESEARCH ARTICLES / GEOPHYSICS
Toward an internally consistent pressure scale

Yingwei Fei^*,, Angele Ricolleau^*, Mark Frank, Kenji Mibe, Guoyin Shen^¶, and Vitali Prakapenka^||

*Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington, DC 20015; Department of Geology and Environmental Geosciences, Northern Illinois University, Davis Hall 312, Normal Road, DeKalb, IL 60115; Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan; ^¶High Pressure Collaborative Access Team, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, IL 60437; and ^||Consortium for Advanced Radiation Sources, University of Chicago, 9700 South Cass Avenue, Argonne, IL 60437

Edited by Russell J. Hemley, Carnegie Institution of Washington, Washington, DC, and approved February 28, 2007 (received for review October 13, 2006)

Our ability to interpret seismic observations including the seismic discontinuities and the density and velocity profiles in the earth's interior is critically dependent on the accuracy of pressure measurements up to 364 GPa at high temperature. Pressure scales based on the reduced shock-wave equations of state alone may predict pressure variations up to 7% in the megabar pressure range at room temperature and even higher percentage at high temperature, leading to large uncertainties in understanding the nature of the seismic discontinuities and chemical composition of the earth's interior. Here, we report compression data of gold (Au), platinum (Pt), the NaCl-B2 phase, and solid neon (Ne) at 300 K and high temperatures up to megabar pressures. Combined with existing experimental data, the compression data were used to establish internally consistent thermal equations of state of Au, Pt, NaCl-B2, and solid Ne. The internally consistent pressure scales provide a tractable, accurate baseline for comparing high pressure–temperature experimental data with theoretical calculations and the seismic observations, thereby advancing our understanding fundamental high-pressure phenomena and the chemistry and physics of the earth's interior.

diamond–anvil cell | high–pressure research | pressure calibration | thermodynamics | x–ray diffraction

The authors declare no conflict of interest.

This article is a PNAS Direct Submission.

To whom correspondence should be addressed. E-mail: fei{at}gl.ciw.edu

© 2007 by The National Academy of Sciences of the USA

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