Melting behavior of Fe‐O‐S at high pressure: A discussion on the melting depression induced by O and S

Huang, Huisheng; Hu, Xiaojun; Jing, Fuqian; Cai, Ling-Cang; Shen, Qiang; Gong, Zizheng; Liu, Hong

doi:10.1029/2009jb006514

Cited by 22 publications

(31 citation statements)

References 66 publications

(92 reference statements)

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“…Recently, Huang et al . [] reported that in total 10 mol % light elements (oxygen and sulfur) can reproduce the PREM data based on their shock experiments [ Huang et al ., ]. If a volume change due to light element incorporation is ignored, considering the mass effect only, our results suggest ~12 mol % oxygen or ~20 mol % sulfur needed to reproduce ρ of the PREM (Figure a).…”

Section: Geophysical Implicationsmentioning

confidence: 87%

“…Density measurements of liquid iron alloys by static experiments have been performed at relatively low pressures (<100 GPa) compared to the Earth's outer core conditions [e.g., Sanloup et al ., , ; Morard et al ., ]. Higher‐pressure behaviors of liquid iron were, on the other hand, investigated by shock wave experiments in the multi‐Mbar regime along the principal Hugoniot [e.g., Brown and McQueen , ; Huang et al ., , , ]. The Hugoniot temperature dramatically increases with increasing pressure and reaches more than 8000 K at the ICB pressure (329 GPa), which is significantly higher than the typically estimated ICB temperature ( T ICB ) of less than 6000 K [e.g., Ma et al ., ; Nguyen and Holmes , ; Alfè , ; Huang et al ., ; Terasaki et al ., ; Kamada et al ., ; Anzellini et al ., ].…”

Section: Introductionmentioning

confidence: 99%

“…Higher‐pressure behaviors of liquid iron were, on the other hand, investigated by shock wave experiments in the multi‐Mbar regime along the principal Hugoniot [e.g., Brown and McQueen , ; Huang et al ., , , ]. The Hugoniot temperature dramatically increases with increasing pressure and reaches more than 8000 K at the ICB pressure (329 GPa), which is significantly higher than the typically estimated ICB temperature ( T ICB ) of less than 6000 K [e.g., Ma et al ., ; Nguyen and Holmes , ; Alfè , ; Huang et al ., ; Terasaki et al ., ; Kamada et al ., ; Anzellini et al ., ]. Thus, the entire P , T conditions of the Earth's outer core are experimentally inaccessible at present, and the P‐V‐T EoS and thermodynamic properties of liquid iron have therefore been considerably extrapolated from limited experimental data sets.…”

Section: Introductionmentioning

confidence: 99%

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The P‐V‐T equation of state and thermodynamic properties of liquid iron

2014

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The equation of state (EoS) and thermodynamic properties of non-magnetic liquid iron were investigated from energy (E)-pressure (P)-volume (V)-temperature (T) relationships calculated by means of ab initio molecular dynamics simulations at 60-420 GPa and 4000-7000 K. Its internally consistent thermodynamic and elastic properties, in particular, density, adiabatic bulk modulus, and P wave velocity, were then analyzed. Compared to the seismological data of the Earth's outer core, pure liquid iron is found to have an 8-10% larger density and 3-10% larger bulk modulus than the Earth's values. Results also show that the P wave velocity of liquid iron has marginal temperature dependence as the bulk sound velocity of solid iron. The new EoS model and thermodynamic properties of liquid iron may serve as fundamental data for the thermochemical modeling of the Earth's core.

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Section: Geophysical Implicationsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The P‐V‐T equation of state and thermodynamic properties of liquid iron

2014

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“…The magnetic-flyer method was used to obtain projectile flyer impacting velocities (w) (Kondo et al, 1977;Shi et al, 1991). The shock wave velocities (D) were obtained by pyrometer system (Huang et al, 2010;Jing, 1999). The particle velocity (u) and the pressure (P)-density (ρ) states were determined by impedance match method (McQueen, 1991).…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

“…Our samples were not heated before shock loading. Based on the following energy relationship of thermodynamics (Huang et al, 2010;Jing, 1999), we determine the temperature of olivine during the shock process: ,…”

Section: Discussionmentioning

confidence: 99%

Hugoniot equation of state of olivine and its geodynamic implications

Huang

Yuan

Chen

et al. 2015

Sci. China Earth Sci.

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Large olivine samples were hot-pressed synthesized for shock wave experiments. The shock wave experiments were carried out at pressure range between 11 and 42 GPa. Shock data on olivine sample yielded a linear relationship between shock wave velocity D and particle velocity u described by D=3.56(0.13)+2.57(0.12)u. The shock temperature is determined by an energy relationship which is approximately 790°C at pressure 28 GPa. Due to low temperature and short experimental duration, we suggest that no phase change occurred in our sample below 30 GPa and olivine persisted well beyond its equilibrium boundary in metastable phase. The densities of metastable olivine are in agreement with the results of static compression. At the depth shallower than 410 km, the densities of metastable olivine are higher than those of the PREM model, facilitating cold slab to sink into the mantle transition zone. However, in entire mantle transition zone, the shock densities are lower than those of the PREM model, hampering cold slab to flow across the "660 km" phase boundary.

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Shock Compression and Melting of an Fe‐Ni‐Si Alloy: Implications for the Temperature Profile of the Earth's Core and the Heat Flux Across the Core‐Mantle Boundary

et al. 2018

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Understanding the melting behavior and the thermal equation of state of Fe‐Ni alloyed with candidate light elements at conditions of the Earth's core is critical for our knowledge of the region's thermal structure and chemical composition and the heat flow across the liquid outer core into the lowermost mantle. Here we studied the shock equation of state and melting curve of an Fe‐8 wt% Ni‐10 wt% Si alloy up to ~250 GPa by hypervelocity impacts with direct velocity and reliable temperature measurements. Our results show that the addition of 10 wt% Si to Fe‐8 wt% Ni alloy slightly depresses the melting temperature of iron by ~200–300 (±200) K at the core‐mantle boundary (~136 GPa) and by ~600–800 (±500) K at the inner core‐outer core boundary (~330 GPa), respectively. Our results indicate that Si has a relatively mild effect on the melting temperature of iron compared with S and O. Our thermodynamic modeling shows that Fe‐5 wt% Ni alloyed with 6 wt% Si and 2 wt% S (which has a density‐velocity profile that matches the outer core's seismic profile well) exhibits an adiabatic profile with temperatures of ~3900 K and ~5300 K at the top and bottom of the outer core, respectively. If Si is a major light element in the core, a geotherm modeled for the outer core indicates a thermal gradient of ~5.8–6.8 (±1.6) K/km in the D″ region and a high heat flow of ~13–19 TW across the core‐mantle boundary.

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Melting behavior of Fe‐O‐S at high pressure: A discussion on the melting depression induced by O and S

Cited by 22 publications

References 66 publications

The P‐V‐T equation of state and thermodynamic properties of liquid iron

The P‐V‐T equation of state and thermodynamic properties of liquid iron

Hugoniot equation of state of olivine and its geodynamic implications

Shock Compression and Melting of an Fe‐Ni‐Si Alloy: Implications for the Temperature Profile of the Earth's Core and the Heat Flux Across the Core‐Mantle Boundary

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