The stability of the earth's core and the geodynamo

Nature ◽  
1976 ◽  
Vol 261 (5560) ◽  
pp. 483-484 ◽  
Author(s):  
J. A. JACOBS ◽  
G. MASTERS
Keyword(s):  
Earth’S Core ◽  
Earth's Core ◽  
The Stability

scholarly journals Phase relations of Fe3 C and Fe7 C3 up to 185 GPa and 5200 K: Implication for the stability of iron carbide in the Earth's core

2016 ◽  
Vol 43 (24) ◽  
pp. 12,415-12,422 ◽  
Author(s):  
Jin Liu ◽  
Jung-Fu Lin ◽  
Vitali B. Prakapenka ◽  
Clemens Prescher ◽  
Takashi Yoshino
Keyword(s):  
Iron Carbide ◽  
Phase Relations ◽  
Earth’S Core ◽  
Earth's Core ◽  
The Stability

scholarly journals Fe5S2 identified as a host for sulfur in Earth’s core

2021 ◽  
Author(s):  
Claire Zurkowski ◽  
Barbara Lavina ◽  
Abigail Case ◽  
Kellie Swadba ◽  
Stella Chariton ◽  
...  
Keyword(s):  
Iron Sulfide ◽  
Inner Core ◽  
Outer Core ◽  
Iron Sulfides ◽  
Earth’S Core ◽  
Earth's Core ◽  
Planetary Cores ◽  
Wide Range ◽  
Metal Metal ◽  
The Stability

Planetary habitability, as we experience on Earth, is linked to a functioning geodynamo which is in part driven by the crystallization of the liquid iron-nickel-alloy core as a planet cools over time. Cosmochemical considerations suggest that sulfur is a candidate light alloying element in rocky planetary cores of varying sizes and oxidation states; such that, iron sulfide phase relations at extreme conditions contribute to outer core thermochemical convection and inner core crystallization in a wide range of planetary bodies. Here we experimentally investigate the structural properties of the Fe-S system and report the discovery of the sulfide, Fe5S2, crystallizing in equilibrium with iron at Earth’s outer core pressures and high temperatures. Using single-crystal X-ray diffraction techniques, Fe5S2 was determined to adopt the complex Ni5As2-type structure (P63cm, Z = 6). These results conclude that Fe5S2 is likely to crystallize at the interface of Earth’s core and mantle and will begin to crystallize during the freezing out of Earth and Venus’ core overtime. The increased metal-metal bonding measured in Fe5S2 compared to the other high P-T iron sulfides may contribute to signatures of higher conductivity from regions of Fe5S2 is crystallization. Fe5S2 could serve as a host for Ni and Si as has been observed in the related meteoritic phase, perryite, (Fe, Ni)8(P, Si)3, adding intricacies to elemental partitioning during inner core crystallization. The stability of Fe5S2 presented here is key to understanding the role of sulfur in the multicomponent crystallization sequences that drive the geodynamics and dictate the structures of Earth and rocky planetary cores.

Earth's core lightens up

Nature ◽  
2010 ◽  
Author(s):  
Geoff Brumfiel
Keyword(s):  
Earth’S Core ◽  
Earth's Core

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.

scholarly journals Leading modes of torsional oscillations within the Earth's core

2009 ◽  
Vol 36 (15) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jean O. Dickey ◽  
Olivier de Viron
Keyword(s):  
Earth’S Core ◽  
Torsional Oscillations ◽  
Earth's Core

Magnetic torque and convection in the earth's core

1977 ◽  
Vol 21 (3-4) ◽  
pp. 320-325
Author(s):  
Gustáv Siráň ◽  
I. Cupal
Keyword(s):  
Magnetic Torque ◽  
Earth’S Core ◽  
Earth's Core
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