scholarly journals Insight of the thermal conductivity of ϵ-iron at Earth’s core conditions from the newly developed direct ab initio methodology

2019 ◽  
Vol 125 (4) ◽  
pp. 045102
Author(s):  
Sheng-Ying Yue ◽  
Ming Hu
Keyword(s):  
Thermal Conductivity ◽  
Ab Initio ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Conditions

scholarly journals New high-pressure phases of Fe7N3 and Fe7C3 stable at Earth's core conditions: evidences for carbon–nitrogen isomorphism in Fe-compounds

RSC Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 3577-3581 ◽  
Author(s):  
Nursultan Sagatov ◽  
Pavel N. Gavryushkin ◽  
Talgat M. Inerbaev ◽  
Konstantin D. Litasov
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Ab Initio ◽  
Structure Prediction ◽  
Harmonic Approximation ◽  
Crystal Structure Prediction ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Conditions

We carried out ab initio calculations on the crystal structure prediction and determination of P–T diagrams within the quasi-harmonic approximation for Fe7N3 and Fe7C3.

The Thermal Conductivity of Earth's Core: A Key Geophysical Parameter's Constraints and Uncertainties

2018 ◽  
Vol 46 (1) ◽  
pp. 47-66 ◽  
Author(s):  
Q. Williams
Keyword(s):  
Thermal Conductivity ◽  
High Pressures ◽  
Inner Core ◽  
Thermal Evolution ◽  
Magnetic Moments ◽  
Earth’S Core ◽  
Earth's Core ◽  
Current State ◽  
Core Conditions

The thermal conductivity of iron alloys at high pressures and temperatures is a critical parameter in governing ( a) the present-day heat flow out of Earth's core, ( b) the inferred age of Earth's inner core, and ( c) the thermal evolution of Earth's core and lowermost mantle. It is, however, one of the least well-constrained important geophysical parameters, with current estimates for end-member iron under core-mantle boundary conditions varying by about a factor of 6. Here, the current state of calculations, measurements, and inferences that constrain thermal conductivity at core conditions are reviewed. The applicability of the Wiedemann-Franz law, commonly used to convert electrical resistivity data to thermal conductivity data, is probed: Here, whether the constant of proportionality, the Lorenz number, is constant at extreme conditions is of vital importance. Electron-electron inelastic scattering and increases in Fermi-liquid-like behavior may cause uncertainties in thermal conductivities derived from both first-principles-associated calculations and electrical conductivity measurements. Additional uncertainties include the role of alloying constituents and local magnetic moments of iron in modulating the thermal conductivity. Thus, uncertainties in thermal conductivity remain pervasive, and hence a broad range of core heat flows and inner core ages appear to remain plausible.

scholarly journals Electron–electron scattering and thermal conductivity ofϵ-iron at Earth’s core conditions

2017 ◽  
Vol 19 (7) ◽  
pp. 073022 ◽  
Author(s):  
L V Pourovskii ◽  
J Mravlje ◽  
A Georges ◽  
S I Simak ◽  
I A Abrikosov
Keyword(s):  
Thermal Conductivity ◽  
Electron Scattering ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Conditions

scholarly journals Ab initio simulations of iron–nickel alloys at Earth's core conditions

2012 ◽  
Vol 345-348 ◽  
pp. 126-130 ◽  
Author(s):  
Alexander S. Côté ◽  
Lidunka Vocˇadlo ◽  
John P. Brodholt
Keyword(s):  
Ab Initio ◽  
Nickel Alloys ◽  
Earth’S Core ◽  
Earth's Core ◽  
Ab Initio Simulations ◽  
Iron Nickel ◽  
Core Conditions ◽  
Iron Nickel Alloys

scholarly journals Low thermal conductivity of iron-silicon alloys at Earth’s core conditions with implications for the geodynamo

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Wen-Pin Hsieh ◽  
Alexander F. Goncharov ◽  
Stéphane Labrosse ◽  
Nicholas Holtgrewe ◽  
Sergey S. Lobanov ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Earth’S Core ◽  
Silicon Alloys ◽  
Earth's Core ◽  
Low Thermal Conductivity ◽  
Iron Silicon ◽  
Core Conditions

scholarly journals First-principles calculations of properties of orthorhombic iron carbideFe7C3at the Earth's core conditions

2015 ◽  
Vol 91 (21) ◽  
Author(s):  
Zamaan Raza ◽  
Nina Shulumba ◽  
Nuala M. Caffrey ◽  
Leonid Dubrovinsky ◽  
Igor A. Abrikosov
Keyword(s):  
First Principles ◽  
First Principles Calculations ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Conditions
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