High-pressure radial X-ray diffraction study of osmium to 58 GPa |
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Authors: | H Chen D He J Liu Y Li F Peng Z Li J Wang and L Bai |
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Institution: | (1) Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, USA;(2) Department of Earth and Planetary Science, University of California, Berkeley CA, 94720, USA;(3) GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany;(4) Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA;(5) Department of Geosciences, Princeton University, Princeton, NJ 08544, USA |
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Abstract: | Nonhydrostatic compression behavior of osmium (Os) was investigated up to
58.2 GPa using radial X-ray diffraction (RXRD) together with lattice strain
theory in a diamond-anvil cell. The apparent bulk modulus of Os derived from
RXRD data varies from 262 GPa to 413 GPa, depending on Ψ, the orientation of
the diffraction planes with respect to the loading axis. Fitting to the
third-order Birch-Murnaghan equation of state, the RXRD data obtained at
Ψ = 54.7° yields a bulk modulus K0 = 390 ± 6 GPa with pressure
derivative K′
0 fixed at 4. The ratio of differential stress to
shear modulus t/G ranges from 0.024 to 0.029 at the pressures of 15.7–58.2 GPa.
The yield strength was observed to increase with compression and reach the
value of 11.7 GPa at the highest pressure. This confirms that Os is the
strongest known pure metallic material compared with the reported stiff
elemental metals such as W, Mo and Re. It was found that the apparent c/a ratio
changed with the nonhydrostatic compression, as well as the
orientation Ψ in our experiments. Moreover, the aggregate moduli of Os at high
pressure were determined from the RXRD measurements. |
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