scholarly journals Pressure-temperature range of reactions between liquid iron in the outer core and mantle silicates

1994 ◽  
Vol 21 (2) ◽  
pp. 153-156 ◽  
Author(s):  
Xi Song ◽  
Thomas J. Ahrens
Keyword(s):  
Liquid Iron ◽  
Outer Core ◽  
Temperature Range ◽  
Mantle Silicates

scholarly journals Carbon-depleted outer core revealed by sound velocity measurements of liquid iron–carbon alloy

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Yoichi Nakajima ◽  
Saori Imada ◽  
Kei Hirose ◽  
Tetsuya Komabayashi ◽  
Haruka Ozawa ◽  
...  
Keyword(s):  
Sound Velocity ◽  
Liquid Iron ◽  
Outer Core ◽  
Velocity Measurements

scholarly journals Liquid iron-sulfur alloys at outer core conditions by first-principles calculations

2014 ◽  
Vol 41 (19) ◽  
pp. 6712-6717 ◽  
Author(s):  
Koichiro Umemoto ◽  
Kei Hirose ◽  
Saori Imada ◽  
Yoichi Nakajima ◽  
Tetsuya Komabayashi ◽  
...  
Keyword(s):  
Liquid Iron ◽  
First Principles ◽  
Outer Core ◽  
First Principles Calculations ◽  
Iron Sulfur ◽  
Core Conditions

Shock-Induced Chemical Reaction between Iron and Enstatite

2013 ◽  
Vol 703 ◽  
pp. 41-44
Author(s):  
Xiu Fang Chen ◽  
Chao Ping Zhang
Keyword(s):  
Liquid Iron ◽  
Outer Core ◽  
Middle Section ◽  
X Ray Diffraction ◽  
Initial Sample ◽  
X Ray ◽  
Core Mantle Boundary ◽  
The Core ◽  
Gas Gun ◽  
Shock Recovery Experiments

By using a two-stage light gas gun, two experiments of shock recovery experiments with initial sample of Fe+(Mg, Fe)SiO3 (En) were conducted between 78 and 113 GPa shock pressure (the corresponding temperature is estimated as 3000~5000K). The recovered samples were analyzed by X-ray Diffraction (XRD).The XRD observation at the middle section of two recovered samples illustrates the new composition of recovered samples is (Mg, Fe)2SiO4.Comparing with the recovery experiments of MgO+SiO2 ,we can infer that iron and perovskite react to form SiO2 and (Mg, Fe)O. The experiments result indicates that reaction between liquid iron and (Mg, Fe)SiO3 perovskite may occur at the core-mantle boundary in geological history. The reaction creates a very heterogeneous zone at the base of the mantle. Si and O dissolved in liquid iron are rapidly dispersed by the flow of the liquid outer core.

scholarly journals Bayesian modelling of the equation of state for liquid iron in Earth’s outer core

2021 ◽  
Author(s):  
T. Matsumura ◽  
Y. Kuwayama ◽  
K. Ueki ◽  
T. Kuwatani ◽  
Y. Ando ◽  
...  
Keyword(s):  
Equation Of State ◽  
Liquid Iron ◽  
Outer Core ◽  
Bayesian Modelling

scholarly journals High Pressure and High Temperature Equation-of-State of Gamma and Liquid Iron

1997 ◽  
Vol 499 ◽  
Author(s):  
George Q. Chen ◽  
Thomas J. Ahrens
Keyword(s):  
Shock Wave ◽  
Equation Of State ◽  
Sound Velocity ◽  
Liquid Iron ◽  
Inner Core ◽  
Melting Curve ◽  
Outer Core ◽  
Pressure Derivative ◽  
Longitudinal Sound Velocity ◽  
Core Boundary

ABSTRACTShock-wave experiments on pure iron preheated to 1573 K were conducted in the 17–73 GPa range. The shock-wave equation of state of γ-iron at an initial temperature of 1573 K can be fit with us = 4.102 (0.015) km/s + 1.610(0.014) up with ρo = 7.413±0.012 Mg/m3 We obtain for γ-iron's bulk modulus and pressure derivative the values: 124.7±1.1 GPa and 5.44±0.06, respectively.We present new data for sound velocities in the γ- and liquid-phases. In the γ-phase, to a first approximation, the longitudinal sound velocity is linear with respect to density: Vp = −3.13 (0.72) + 1.119(0.084) p(units for Vp and p are km/s and Mg/m3, respectively). Melting was observed in the highest pressure (about 70–73 GPa) experiments at a calculated shock temperature of 2775±160 K. This result is consistent with a previously calculated melting curve (for ε-iron) which is close to those measured by Boehler [1] and Saxena et al. [2]. The liquid iron sound velocity data yields a Grüneisen parameter value of 1.63±0.28 at 9.37±0.02 Mg/m3 at 71.6 GPa. The quantity γρ is 15.2±2.6 Mg/m3, which agrees with the uncertainty bounds of Brown and McQueen [3] (13.3–19.6 Mg/m3). Based on upward pressure and temperature extrapolation of the melting curve of γ-iron, the estimated inner core-outer core boundary temperature is 5500±400 K, the temperature at the core-mantle boundary on the outer core side is 3930±630 K.

scholarly journals Thermodynamic modeling of isotherms of oxygen solubility in liquid metal of Fe – Mg – Al – O system

2019 ◽  
Vol 62 (8) ◽  
pp. 639-645 ◽  
Author(s):  
G. G. Mikhailov ◽  
O. V. Samoilova ◽  
L. A. Makrovets ◽  
L. A. Smirnov
Keyword(s):  
Solid Solution ◽  
Liquid Metal ◽  
Liquid Iron ◽  
Thermodynamic Modeling ◽  
Equilibrium Constants ◽  
Oxygen Solubility ◽  
Ionic Solutions ◽  
Temperature Range ◽  
Oxide Melt ◽  
Oxide Phases

Studying the interaction between oxygen and magnesium and aluminum dissolved in liquid iron is an important task in order to choose optimal parameters for refining and casting of steels. Relevance of this research is caused by determining the possibility and conditions for formation of unfavorable refractory particles of magnesium oxideand magnesian spinel in a metal melt. In the course of this research, thermodynamic modeling of phase equilibria implemented in liquid metal of such systems as Fe – Mg – O, Fe – Al – O and Fe – Mg – Al – O within the temperature range of 1550 – 1650 °С was carried out. Calculation was made using the technique of constructing the solubility surfaces for the metal components which connects quantitative changes in composition of a liquid metal with qualitative changes in composition of products obtained as a result of interaction of a metallic melt’s components. The modeling method was based not only on usin­g equilibrium constants of reactions occurring between components of the systems under research in the selected temperature range, but also on taking into account the values of interaction parameters of the first order (according to Wagner) of elements in liquid iron. In order to simulate activities of the oxide melt conjugated with the metallic one, approximation of the theory of subregular ionic solutions was used. To model activities of oxides solid solution, approximation of the theory of regular ionic solutions was used. And the theory of ideal ionic solutions was used for the solid solution of spinels. In the course of the work, isotherms of oxygen’s solubility in liquid metal of systems Fe – Mg – O, Fe – Al – O and Fe – Mg – Al – O have been constructed, and regions of thermodynamic stability of oxide phases conjugated with the metallic melt have been determined. In particular, compositions area of a liquid metal which is going to be in equilibrium with the solid solution of spinels | FeAl 2 O 4 , MgAl 2 O 4 | solid solution has been determined for Fe – Mg – Al – O system. Results obtained in the course of thermodynamic modeling have been compared to experimental data.

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