2000
DOI: 10.1103/physrevlett.84.1720
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In SituX-Ray Study of Thermal Expansion and Phase Transition of Iron at Multimegabar Pressure

Abstract: The density of varepsilon-iron has been calculated at pressures and temperatures up to 300 GPa and 1300 K, respectively. We observe varepsilon to beta phase transition at pressures between 135 and 300 GPa and temperature above 1350 K; the pattern can be interpreted in terms of double hexagonal close-packed structure. The density calculated at high pressure and temperature (330-360 GPa and 5000-7000 K) closely matches with preliminary reference Earth model density, thereby imposing constraint on the composition… Show more

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Cited by 199 publications
(110 citation statements)
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“…6). The calculations show fair agreements with the shock wave 71 and in situ x-ray 61 measurements at high pressures and temperatures (P ≈ 200 GPa, T ≈ 5200 K). Isaak and…”
Section: Thermal Equation Of Statesupporting
confidence: 59%
See 1 more Smart Citation
“…6). The calculations show fair agreements with the shock wave 71 and in situ x-ray 61 measurements at high pressures and temperatures (P ≈ 200 GPa, T ≈ 5200 K). Isaak and…”
Section: Thermal Equation Of Statesupporting
confidence: 59%
“…Many different techniques have been used to determine the Grüneisen ratio of hcp Fe, including nuclear resonant inelastic x-ray scattering, 51 Raman, 54 x-ray diffraction, 61,74 shock wave, 75 and thermodynamic analysis. 76,77 At a given pressure, our calculated γ first increases with temperature, and then drops rapidly at high temperatures (T >1500 K), as shown in Fig.…”
Section: Thermal Equation Of Statementioning
confidence: 99%
“…With the recent development in high-pressure and high-temperature experimental techniques and concurrent advance in synchrotron radiation facilities, this simplified core composition model has become amenable to investigations under increasingly higher pressures and temperatures. Using diamond-anvil cells and internal heating technique, Dubrovinsky et al (5,6) determined the thermal expansion of Fe to a maximum pressure of 300 GPa and a maximum temperature of 1,500 K. Two multianvil studies covered similar range of temperature at moderate pressures (7,8). An independent estimate of the Debye temperature has been obtained from nuclear resonant inelastic scattering measurements, which determined the phonon density of states of Fe up to 153 GPa and at ambient temperature (9).…”
Section: Thermal Expansion Of Fe-rich Alloys Under Static High Pressumentioning
confidence: 99%
“…The direct measurements of the iron volume at pressures above the pressure of the triple point (about 60 GPa [8]) and elevated temperatures are technically difficult. While the 300 K isotherm for iron is rather reliably determined [3], the highest pressure and temperature achieved until recently in volumetric experiments were limited to about 35 GPa and 1500 K. The comparably high temperature measurements at the highest pressure [15] manifested a major breakthrough in this field, because for the first time iron volumes were measured at pressures up to about 300 GPa and at temperatures up to 1500 K. Even though this temperature is rather modest compared to the temperatures relevant for the Earth core (up to 7000-8000 K), the experiment provides direct measurements of thermal expansion at the pressure of the Earth core.…”
Section: Introductionmentioning
confidence: 99%
“…This subject has attracted considerable attention. Significant efforts, both experimental [3][4][5][6][7][8][9][10][11][12][13][14][15][16] and theoretical [2,[16][17][18][19][20][21][22], have been undertaken to determine the properties of iron under extreme conditions. Several structures have been suggested as relevant for iron at the conditions of the Earth core, namely hcp ( ), bcc, dhcp and orthorombic structures.…”
Section: Introductionmentioning
confidence: 99%