EFFECT OF CARBON ON THE SEISMIC PROPERTIES SOLID IRON AT HIGH PRESSURES: HIDDEN CARBON RESERVOIR IN EARTH'S CORE

2017 ◽  
Author(s):  
Bin Chen ◽  
◽  
Xiaojing Lai
Keyword(s):  
High Pressures ◽  
Earth’S Core ◽  
Earth's Core ◽  
Seismic Properties ◽  
Solid Iron ◽  
Carbon Reservoir

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.

Effect of light elements on the sound velocities in solid iron: Implications for the composition of Earth's core

2007 ◽  
Vol 254 (1-2) ◽  
pp. 233-238 ◽  
Author(s):  
James Badro ◽  
Guillaume Fiquet ◽  
François Guyot ◽  
Eugene Gregoryanz ◽  
Florent Occelli ◽  
...  
Keyword(s):  
Light Elements ◽  
Earth’S Core ◽  
Earth's Core ◽  
Solid Iron ◽  
Effect Of Light ◽  
Sound Velocities

scholarly journals Temperature of Earth's core constrained from melting of Fe and Fe0.9Ni0.1 at high pressures

2016 ◽  
Vol 447 ◽  
pp. 72-83 ◽  
Author(s):  
Dongzhou Zhang ◽  
Jennifer M. Jackson ◽  
Jiyong Zhao ◽  
Wolfgang Sturhahn ◽  
E. Ercan Alp ◽  
...  
Keyword(s):  
High Pressures ◽  
Earth’S Core ◽  
Earth's Core

X-ray diffraction and Mössbauer spectroscopy study of fcc iron hydride FeH at high pressures and implications for the composition of the Earth's core

2011 ◽  
Vol 307 (3-4) ◽  
pp. 409-414 ◽  
Author(s):  
Olga Narygina ◽  
Leonid S. Dubrovinsky ◽  
Catherine A. McCammon ◽  
Alexander Kurnosov ◽  
Innokenty Yu. Kantor ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
High Pressures ◽  
Mossbauer Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
Earth’S Core ◽  
Earth's Core ◽  
X Ray ◽  
Mößbauer Spectroscopy ◽  
Iron Hydride
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