Measurements of Sound Velocity of Liquid Fe‐11.8 wt % S up to 211.4 GPa and 6,150 K

Huang, Huisheng; Leng, Chunwei; Wang, Q.; Yang, Gang; Hu, Xiaojun; Wu, Yanmei; Liu, X.; Fei, Yingwei

doi:10.1029/2017jb015269

Cited by 10 publications

(9 citation statements)

References 52 publications

(145 reference statements)

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“…The red dash dot line is the calculated adiabat for Fe-9O. calculated in this way has been proved to correspond to experimental data measured by the front surface impact and optical analyzer techniques (Huang et al, 2018;Mcqueen et al, 1967).…”

Section: Ofsupporting

confidence: 62%

“…

C_{H} = \sqrt{\frac{K_{s}}{ρ}} = {{(\frac{\partial P}{\partial ρ})}_{H} [1 - \frac{γ}{2 ρ_{0}} (ρ - ρ_{0})] + \frac{P_{H} γ}{2 ρ}}^{\frac{true}{1}}

C_{B} = {(C_{H}^{2} + γ V^{2} normalΔ P)}^{\frac{true}{1}}

where

C_{H}

is the bulk sound velocity along the Hugoniot,

{(\partial P / \partial ρ)}_{H}

is the local slope of adiabat, and

Δ P

is the difference in pressure along the Hugoniot and isotherm at the same density. The sound velocity calculated in this way has been proved to correspond to experimental data measured by the front surface impact and optical analyzer techniques (Huang et al., 2018; Mcqueen et al., 1967).…”

Section: Resultsmentioning

confidence: 53%

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Equation of State for Fe‐9.0 wt% O up to 246 GPa: Implications for Oxygen in the Earth's Outer Core

et al. 2021

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Oxygen has been proposed as a potential major light element because it is the most abundant element on Earth. The partition experiments of siderophile elements between silicate melts and liquid metals also indicate that oxygen is a plausible candidate for a light element dissolved in the Earth's outer core (Fischer, 2015; Frost et al., 2010; Ozawa et al., 2009; Takafuji et al., 2005). The impact of oxygen on the density and sound velocity of Fe-rich melts is critical for interpreting the composition, dynamics, and evolution of the Earth's core. However, the amount of oxygen in the core is still a topic of debate. To examine the possibility of oxygen being the main light element in the Earth's outer core, the equation of sate (EoS) and phase relations of FeO were measured by static compression and shock wave loading. Fischer et al. (2011a, 2011b) performed X-ray diffraction measurements using a laser-heated diamond anvil cell to achieve the EoS of FeO, and determined that ∼7.7 wt% oxygen is required in the outer core to match the seismologically determined density. Our previous shockwave data in the Fe-SO system showed negligible oxygen in the outer core since adding oxygen into liquid iron would not simultaneously reproduce the observed density and sound velocity profiles of the outer core (Huang et al., 2011). The liquid phase relation, especially, the Fe-FeO eutectic alloys, provides another clue to constrain the outer core composition. The latest melting data on Fe-O alloys up to 204 GPa in a diamond-anvil cell supported ∼13 wt% oxygen in the liquid outer core (Oka et al., 2019). A thermodynamic model developed by Komabayashi (2014) predicted ∼12 wt% oxygen in the eutectic liquid composition at 330 GPa, which contradicts the experimental results reported by Morard et al. (2017). Therefore, the constraint on the concentration of oxygen in the Earth's

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Section: Ofsupporting

confidence: 62%

“…

C_{H} = \sqrt{\frac{K_{s}}{ρ}} = {{(\frac{\partial P}{\partial ρ})}_{H} [1 - \frac{γ}{2 ρ_{0}} (ρ - ρ_{0})] + \frac{P_{H} γ}{2 ρ}}^{\frac{true}{1}}

C_{B} = {(C_{H}^{2} + γ V^{2} normalΔ P)}^{\frac{true}{1}}

where

C_{H}

is the bulk sound velocity along the Hugoniot,

{(\partial P / \partial ρ)}_{H}

is the local slope of adiabat, and

Δ P

Section: Resultsmentioning

confidence: 53%

Equation of State for Fe‐9.0 wt% O up to 246 GPa: Implications for Oxygen in the Earth's Outer Core

et al. 2021

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“…Mori et al () conducted the melting experiments on Fe‐Fe 3 S system up to 254 GPa, and they found 5.7±0.3 wt% S in the eutectic liquid and 3.9±0.4 wt% S in solid Fe, respectively. Huang et al () suggested that both the density and sound velocity of liquid Fe‐10 wt% S match the PREM data for the liquid outer core. Of course, some scientific achievements opposed S as the main light elements of Earth's core.…”

Section: Results and Geophysical Implicationmentioning

confidence: 84%

“…The reverse-impact technique has been described by Duffy and Ahrens (1995). The diagram of the target was shown in Figure S1 (Huang et al, 2011(Huang et al, , 2018. For this technique, a single crystal lithium fluoride (LiF) was used as window.…”

Section: Reverse-impact Techniquementioning

confidence: 99%

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Equation of State for Shocked Fe‐8.6 wt% Si up to 240 GPa and 4,670 K

et al. 2019

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Using dynamic compression technique, the equation of state for Fe‐8.6 wt% Si was measured up to 240 GPa and 4,670 K. A least squares fit to the experimental data yields the Hugoniot parameters C0 = 4.603±0.101 km/s and λ = 1.505±0.037 with initial density ρ0=7.386±0.021 g/cm3. Based on the Hugoniot data, the calculated isothermal equation of state is consistent with static compression data when the lattice Grüneisen parameter γl =1.65(7.578/ρ) and electronic Grüneisen parameter γe=1.83. The calculated pressure‐density data at 300 K were fitted to a third‐order Birch‐Murnaghan equation of state with zero pressure the parameters K0=192.1±6.3 GPa, K0'=4.71±0.27 with fixed ρ0ε =7.578±0.050 g/cm3. Under the conditions of Earth's core, the densities of Fe‐8.6±2.0 wt% Si and Fe‐3.8±2.9 wt% Si agree with preliminary reference Earth mode (PREM) data of the outer and the inner core, respectively. These are the upper limits for Si in the core assuming Si is the only light element. Simultaneously considering the geophysical and geochemical constraints for a Si‐S‐bearing core, the outer core may contain 3.8±2.9 wt% Si and 5.6±3.0 wt% S.

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Solidification of lunar core from melting experiments on the Fe–Ni–S system

Liu

2020

Earth and Planetary Science Letters

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Measurements of Sound Velocity of Liquid Fe‐11.8 wt % S up to 211.4 GPa and 6,150 K

Cited by 10 publications

References 52 publications

Equation of State for Fe‐9.0 wt% O up to 246 GPa: Implications for Oxygen in the Earth's Outer Core

Equation of State for Fe‐9.0 wt% O up to 246 GPa: Implications for Oxygen in the Earth's Outer Core

Equation of State for Shocked Fe‐8.6 wt% Si up to 240 GPa and 4,670 K

Solidification of lunar core from melting experiments on the Fe–Ni–S system

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