Kei Hirose
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View article: Origin of Earth’s hydrogen and carbon constrained by their core-mantle partitioning and bulk Earth abundance
Origin of Earth’s hydrogen and carbon constrained by their core-mantle partitioning and bulk Earth abundance Open
View article: Electrical Conductivity of Hydrous SiO <sub>2</sub> : Implications for the Superionic State and High Conductivity Anomalies Beneath Subduction Zones
Electrical Conductivity of Hydrous SiO <sub>2</sub> : Implications for the Superionic State and High Conductivity Anomalies Beneath Subduction Zones Open
Electrical conductivity (EC) is a key physical property of minerals and rocks that constrains the composition and structure of Earth's deep interior. Theoretical studies predict that the CaCl 2 ‐type hydrous Al‐bearing SiO 2 phase, present…
View article: Thermal conductivity and evolution of the Earth's and Mars' cores
Thermal conductivity and evolution of the Earth's and Mars' cores Open
View article: Evolution of electronic correlation in highly doped organic two-dimensional hole gas
Evolution of electronic correlation in highly doped organic two-dimensional hole gas Open
Strong electron correlation is the essential mediator that creates various exotic phases in two-dimensional electronic systems which has been continuously intriguing in modern condensed-matter physics. Such electronic states as Mott insula…
View article: Electrical and thermal conductivities of Fe–Ni–Si alloy under core conditions: A reevaluation
Electrical and thermal conductivities of Fe–Ni–Si alloy under core conditions: A reevaluation Open
View article: Strong compositional gradient in the Earth's inner core?
Strong compositional gradient in the Earth's inner core? Open
View article: Melting Experiments on Fe-H and Implications for the Earth’s Core
Melting Experiments on Fe-H and Implications for the Earth’s Core Open
View article: Fe‐FeH Eutectic Melting Curve and the Estimates of Earth's Core Temperature and Composition
Fe‐FeH Eutectic Melting Curve and the Estimates of Earth's Core Temperature and Composition Open
Fe and FeH form a binary eutectic system above ∼40 GPa. Here we performed melting experiments in a laser‐heated diamond‐anvil cell and obtained the Fe‐FeH eutectic melting curve between 52 and 175 GPa. Its extrapolation shows the eutectic …
View article: Inversion of the temperature dependence of thermal conductivity of hcp iron under high pressure
Inversion of the temperature dependence of thermal conductivity of hcp iron under high pressure Open
View article: Trace element partitioning in a deep magma ocean and the origin of the Hf-Nd mantle array
Trace element partitioning in a deep magma ocean and the origin of the Hf-Nd mantle array Open
Crystallization in Earth’s deep magma ocean could have caused trace element fractionation in the lower mantle that might be inherited to the isotopic compositions of the present-day mantle. However, the trace element partitioning has been …
View article: Melting experiments on Fe-S-O-C alloys at Martian core conditions: Possible structures in the O- and C-bearing core of Mars
Melting experiments on Fe-S-O-C alloys at Martian core conditions: Possible structures in the O- and C-bearing core of Mars Open
Recent seismological studies of the Martian core revealed its relatively low density, suggesting the presence of large amounts of light elements including oxygen and carbon in addition to sulfur. In order to reveal crystallizing solids in …
View article: Electrical Conductivity of Dense MgSiO <sub>3</sub> Melt Under Static Compression
Electrical Conductivity of Dense MgSiO <sub>3</sub> Melt Under Static Compression Open
The magnetic fields of terrestrial planets are created by core convection. Molten silicate mantles could also generate magnetic fields through their convective motion, known as a silicate dynamo. Recent computational studies have suggested…
View article: Melting experiments on Fe-S-O-C alloys at Martian core conditions: Possible structures in the O- and C-bearing core of Mars
Melting experiments on Fe-S-O-C alloys at Martian core conditions: Possible structures in the O- and C-bearing core of Mars Open
View article: Formation of Iron-Helium Compounds under High Pressure
Formation of Iron-Helium Compounds under High Pressure Open
We report the formations of fcc and distorted hcp iron-helium compounds with x in FeHex up to 0.13 and 0.48, respectively, based on experiments at 5-54 GPa and ~1000-2820 K. Upon releasing pressure under room temperature, these fcc and dis…
View article: Fe-FeH Eutectic Melting Curve and the Estimates of Earth's Core Temperature and Composition
Fe-FeH Eutectic Melting Curve and the Estimates of Earth's Core Temperature and Composition Open
Fe and FeH form a binary eutectic system above ~40 GPa. Here we performed melting experiments in a laser-heated diamond-anvil cell (DAC) and obtained the Fe-FeH eutectic melting curve between 52 and 175 GPa. Its extrapolation shows the eut…
View article: Order- <i>N</i> calculations for thermoelectric power factor based on linear response theory
Order- <i>N</i> calculations for thermoelectric power factor based on linear response theory Open
We present an order- N quantum transport calculation methodology to evaluate thermoelectric transport coefficients, such as electric conductivity and Seebeck coefficient. Different from a conventional method using the electric conductivity…
View article: Picosecond acoustics on iron and nickel in an internal-resistive- heated diamond anvil cell to 50 GPa and 2000 K
Picosecond acoustics on iron and nickel in an internal-resistive- heated diamond anvil cell to 50 GPa and 2000 K Open
We have determined the longitudinal wave velocity (VP) of iron (Fe) and nickel (Ni) up to 50 GPa and 2040 K by combining picosecond acoustics and internal-resistive-heated diamond anvil cell (DAC) techniques. The high pressure–t…
View article: Melting Behavior of B1 FeO Up To 186 GPa: Existence of FeO‐Rich Melts in the Lowermost Mantle
Melting Behavior of B1 FeO Up To 186 GPa: Existence of FeO‐Rich Melts in the Lowermost Mantle Open
FeO is an important component in both mantle silicates and core iron alloys. Understanding its melting behavior and physical properties is crucial for exploring the chemistry and physics of our planet. Here we report the melting curve of F…
View article: Exploring the deep Earth and planetary interiors by high-pressure experiments
Exploring the deep Earth and planetary interiors by high-pressure experiments Open
While the deep Earth is not directly accessible, it can be explored by laboratory experiments under high-pressure and -temperature (P-T) combined with geophysical observations and geodynamical modeling. We conduct experiments using a laser…
View article: Equation of State of Liquid Fe<sub>7</sub>C<sub>3</sub> and Thermodynamic Modeling of the Liquidus Phase Relations in the Fe‐C System
Equation of State of Liquid Fe<sub>7</sub>C<sub>3</sub> and Thermodynamic Modeling of the Liquidus Phase Relations in the Fe‐C System Open
We calculated the pressure‐volume relations of liquids Fe and Fe 7 C 3 up to ∼360 GPa and 3000–8000 K based on the first‐principles molecular dynamics simulations. The results demonstrate that liquid Fe 7 C 3 is similar in compressibility …
View article: Equation of State of Liquid Fe7C3 and Thermodynamic Modeling of the Liquidus Phase Relations in the Fe-C System
Equation of State of Liquid Fe7C3 and Thermodynamic Modeling of the Liquidus Phase Relations in the Fe-C System Open
View article: Hot interiors of ice giant planets inferred from electrical conductivity of dense H2O fluid
Hot interiors of ice giant planets inferred from electrical conductivity of dense H2O fluid Open
Uranus and Neptune have intrinsic magnetic fields generated via convection in a molten H2O layer, where the field strength is determined by its electrical conductivity (EC) along with convection size and velocity. Previous shock experiment…
View article: Pressure dependence of metal–silicate partitioning explains the mantle phosphorus abundance
Pressure dependence of metal–silicate partitioning explains the mantle phosphorus abundance Open
Previous experiments performed below 20 GPa suggested that the metal/silicate partition coefficient of phosphorus (P), D P , extrapolated to typical high-pressure and -temperature conditions of the Earth’s core formation gives too high P c…
View article: Melting experiments on Fe-S-O-C alloys at Martian core conditions: Possible structures in the O- and C-bearing core of Mars
Melting experiments on Fe-S-O-C alloys at Martian core conditions: Possible structures in the O- and C-bearing core of Mars Open
View article: Formation of Iron-Helium Alloys under High Pressure
Formation of Iron-Helium Alloys under High Pressure Open
Table 1. Experimental Results Table S1. EPMA data Table S2. EoS parameters
View article: Impurity Resistivity of the Earth's Inner Core
Impurity Resistivity of the Earth's Inner Core Open
Seismic observations suggest that the Earth's inner core has a complex structure (e.g., the isotropic layer at the top, innermost inner core, and hemispherical dichotomy). These characteristics are believed to reflect the history of dynami…
View article: Equation of State of Liquid Fe7C3 and Thermodynamic Modeling of the Liquidus Phase Relations in the Fe-C System
Equation of State of Liquid Fe7C3 and Thermodynamic Modeling of the Liquidus Phase Relations in the Fe-C System Open
View article: Melting Behaviour of B1 FeO up to 186 GPa: Existence of FeO-rich Silicate Melt in the Lowermost Mantle
Melting Behaviour of B1 FeO up to 186 GPa: Existence of FeO-rich Silicate Melt in the Lowermost Mantle Open
The tables here contains experimental raw datasets supporing the findings in the article of "Melting Behaviour of B1 FeO up to 186 GPa: Existence of FeO-rich Silicate Melt in the Lowermost Mantle".
View article: Impurity resistivity of the Earth's inner core
Impurity resistivity of the Earth's inner core Open
Seismic observations suggest that the Earth’s inner core has a complex structure (e.g., the isotropic layer at the top, innermost inner core, and hemispherical dichotomy). These characteristics are believed to reflect the history of dynami…
View article: Supplementary tables for "Impurity resistivity of the Earth's inner core"
Supplementary tables for "Impurity resistivity of the Earth's inner core" Open
Supplementary tables for "Impurity resistivity of the Earth's inner core" contain the results of first-principles calculations on the electrical resistivity of 4- and 6-component hcp Fe alloys at the Earth's inner core pressure.