DOI: 10.1029/jb091ib05p04677. Static compression of iron to 78 GPa with rare gas solids as pressure‐transmitting media

Static compression of iron to 78 GPa with rare gas solids as pressure‐transmitting media

10.1029/jb091ib05p04677

Crossref journal-article

American Geophysical Union (AGU)

Journal of Geophysical Research: Solid Earth (13)

Abstract

New data are presented for the room temperature, static compression of iron to 78 GPa with solid neon and argon as pressure‐transmitting media. X ray diffraction studies have been performed on a geophysically relevant material, for the first time to such pressures under quasihydrostatic conditions, in a diamond anvil cell. The hydrostatic technique leads to increased precision in the measurement of high pressures and has placed closer constraints on the equation of state of ε iron. From a linear least squares fit of a finite strain equation of state to the present data combined with earlier, low‐pressure data for metastable ε iron, the preferred values for the zero‐pressure isothermal bulk modulus, K0, and first pressure derivative, K0′, are 192.7 (±9.0) GPa and 4.29 (±0.36), respectively. The zero‐pressure volume for the ε phase is 6.687 (±0.018) cm3/mol. On the basis of the pressure‐volume curve calculated from fits of the finite strain equation of state, ε iron appears to be less compressible under nonhydrostatic conditions, but the differences are within the error of the nonhydrostatic experiment. The results also confirm that the absence of a soft medium in static compression experiments with the diamond anvil cell results in an overestimate of the unit cell volume (measured with the incident X ray beam parallel to the load axis) for pressures calculated with the nonhydrostatic ruby calibration scale. It is found that for ε iron, substantial compensation for this nonhydrostatic effect is implicit in the nonhydrostatic ruby pressure scale up to intermediate strains. The hydrostatic data and the ε iron isotherm derived from shock wave experiments on iron samples are in very close agreement.

Bibliography

Jephcoat, A. P., Mao, H. K., & Bell, P. M. (1986). Static compression of iron to 78 GPa with rare gas solids as pressureâtransmitting media. Journal of Geophysical Research: Solid Earth, 91(B5), 4677â4684. Portico.

Authors 3

Andrew P. Jephcoat (first)
H. K. Mao (additional)
Peter M. Bell (additional)

References 47 Referenced 247

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Dates

Type	When
Created	17 years, 6 months ago (Feb. 6, 2008, 11:36 a.m.)
Deposited	1 year, 11 months ago (Sept. 23, 2023, 4:47 a.m.)
Indexed	2 weeks, 4 days ago (Aug. 6, 2025, 8:44 a.m.)
Issued	39 years, 4 months ago (April 10, 1986)
Published	39 years, 4 months ago (April 10, 1986)
Published Online	12 years, 11 months ago (Sept. 20, 2012)
Published Print	39 years, 4 months ago (April 10, 1986)

Funders 0

None

BibTeX

@article{Jephcoat_1986, title={Static compression of iron to 78 GPa with rare gas solids as pressure‐transmitting media}, volume={91}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/jb091ib05p04677}, DOI={10.1029/jb091ib05p04677}, number={B5}, journal={Journal of Geophysical Research: Solid Earth}, publisher={American Geophysical Union (AGU)}, author={Jephcoat, Andrew P. and Mao, H. K. and Bell, Peter M.}, year={1986}, month=apr, pages={4677–4684} }

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