Static compression of iron to 78 GPa with rare gas solids as pressure‐transmitting media
抄録
<jats:p>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, <jats:italic>K</jats:italic><jats:sub>0</jats:sub>, and first pressure derivative, <jats:italic>K</jats:italic><jats:sub>0</jats:sub>′, 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) cm<jats:sup>3</jats:sup>/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.</jats:p>
収録刊行物
-
- Journal of Geophysical Research: Solid Earth
-
Journal of Geophysical Research: Solid Earth 91 (B5), 4677-4684, 1986-04-10
American Geophysical Union (AGU)
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1360574093497003904
-
- NII論文ID
- 30034753019
-
- ISSN
- 01480227
-
- データソース種別
-
- Crossref
- CiNii Articles