Transport properties for liquid silicon-oxygen-iron mixtures at Earth's core conditions

@article{Pozzo2013TransportPF,
  title={Transport properties for liquid silicon-oxygen-iron mixtures at Earth's core conditions},
  author={M. Pozzo and C. Davies and D. Gubbins and D. Alf{\'e}},
  journal={Physical Review B},
  year={2013},
  volume={87},
  pages={014110}
}
We report on the thermal and electrical conductivities of two liquid silicon-oxygen-iron mixtures (Fe0.82Si0.10O0.08 and Fe0.79Si0.08O0.13), representative of the composition of the Earth’s outer core at the relevant pressure-temperature conditions, obtained from density functional theory calculations with the Kubo-Greenwood formulation. We find thermal conductivities k = 100(160) W m −1 K −1 , and electrical conductivities σ = 1.1(1.3) × 10 6 � −1 m −1 at the top (bottom) of the outer core… Expand
Thermal and electrical conductivity of solid iron and iron-silicon mixtures at Earth's core conditions
We report on the thermal and electrical conductivities of solid iron and iron–silicon mixtures (Fe0.92Si0.08 and Fe0.93Si0.07), representative of the composition of the Earth's solid inner core atExpand
Saturation of electrical resistivity of solid iron at Earth’s core conditions
TLDR
The present results support the saturation effect idea, showing that at low temperature the resistivity increases linearly with temperature, and saturates at high temperature. Expand
Liquid iron‐sulfur alloys at outer core conditions by first‐principles calculations
We examined the density, bulk sound (compressional) velocity, and Gruneisen parameter of liquid pure Fe, Fe100H28 (0.50 wt % H), Fe88H40 (0.81 wt % H), and Fe76H52 (1.22 wt % H) at Earth's outer coreExpand
Constraints on the thermal evolution of Earth's core from ab initio calculated transport properties of FeNi liquids
Abstract Earth's magnetic field is generated by the liquid outer core and sensitively depends on the thermal conductivity of the core. The dominant component of the Earth's core is Fe (∼85%) and NiExpand
Experimental determination of the electrical resistivity of iron at Earth's core conditions.
TLDR
The low electrical resistivity of iron indicates the high thermal conductivity of Earth's core, suggesting rapid core cooling and a young inner core less than 0.7 billion years old. Expand
On core convection and the geodynamo: Effects of high electrical and thermal conductivity
Recent theory and experiment suggest the thermal and electrical conductivities of the Earth’s core are 2–4 times higher than previously thought. This has important consequences for the core’s thermalExpand
Resistivity saturation in liquid iron–light-element alloys at conditions of planetary cores from first principles computations
Abstract We present a comprehensive analysis of electrical resistivity for liquid Fe–Si, Fe–S, and Fe–O alloys from first principles computations, covering the pressure/temperature conditions andExpand
The high conductivity of iron and thermal evolution of the Earth’s core
Abstract We measured the electrical resistivity of iron and iron-silicon alloy to 100 GPa. The resistivity of iron was also calculated to core pressures. Combined with the first geophysical modelExpand
Electrical and thermal transport properties of Fe–Ni based ternary alloys in the earth's inner core: An ab initio study
Abstract Besides iron, the Earth's core also contains 5–10% of nickel and several light elements such as H, C, N, O, Si and S. Fe-Ni alloys have been considered as the host material with 10% Ni. TheExpand
Electrical resistivity and thermal conductivity of hcp Fe-Ni alloys under high pressure: Implications for thermal convection in the Earth's core
Abstract We measured the electrical resistivity of Fe–Ni alloys (iron with 5, 10, and 15 wt.% nickel) using four-terminal method in a diamond-anvil cell up to 70 GPa at 300 K. The results demonstrateExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 112 REFERENCES
Oxygen in the Earth's core: a first-principles study
Abstract First-principles electronic structure calculations based on DFT have been used to study the thermodynamic, structural and transport properties of solid solutions and liquid alloys of ironExpand
Thermal and electrical conductivity of iron at Earth’s core conditions
TLDR
New estimates indicate that the adiabatic heat flux is 15 to 16 terawatts at the CMB, higher than present estimates of CMB heat flux based on mantle convection; the top of the coremust be thermally stratified and any convection in the upper core must be driven by chemical convection against the adverse thermal buoyancy or lateral variations in CMBHeat flow. Expand
A revised estimate of the conductivity of iron alloy at high pressure and implications for the core energy balance
Abstract The theory of the electrical and thermal conductivities of iron alloy at high pressure is re-examined, with a downward revision of the estimated thermal conductivity of the core to 28–29 W mExpand
Electrical and thermal conductivities of Fe–Ni–Si alloy under core conditions
Abstract Extrapolation to core conditions of laboratory observations of electrical resistivities of iron and its alloys has been hampered by lack of understanding of interactions between the effectsExpand
Structure and dynamics of liquid iron under Earth’s core conditions
First-principles molecular-dynamics simulations based on density-functional theory and the projector augmented wave (PAW) technique have been used to study the structural and dynamical properties ofExpand
Temperature of the inner-core boundary of the Earth: Melting of iron at high pressure from first-principles coexistence simulations
The Earth's core consists of a solid ball with a radius of 1221 Km, surrounded by a liquid shell which extends up to 3480 km from the center of the planet, roughly half way toward the surface (theExpand
Electrical resistivity and thermal conductivity of liquid Fe alloys at high P and T, and heat flux in Earth’s core
TLDR
First-principles electronic structure computations to determine the thermal conductivity and electrical resistivity for Fe, Fe–Si, and Fe–O liquid alloys agree very well with existing shock compression measurements and shows strong dependence on light element concentration and type. Expand
Thermal conductivity of hcp iron at high pressure and temperature
Results of steady-state heat transfer experiments on iron in laser-heated diamond anvil cell, combined with numerical simulation using finite-element method are reported. Thermal boundary conditions,Expand
Electrical and thermal conductivity of Al liquid at high pressures and temperatures from ab initio computations
using first-principles molecular dynamics. Our results are consistent with measurements at low pressures, and indicate that electronic transport coefficients σ and κ increase under compression; withExpand
Composition and temperature of the Earth's core constrained by combining ab initio calculations and seismic data
It is shown how ab initio techniques based on density functional theory can be used to calculate the chemical potentials of the leading candidate impurity elements (S, O and Si) in the Earth’s solidExpand
...
1
2
3
4
5
...