Tatsuya Sakamaki
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View article: Structural Analysis of Silicate Glasses and Melts under High Pressure and High Temperature Conditions Based on Synchrotron X-ray and Neutron Diffraction Experiments
Structural Analysis of Silicate Glasses and Melts under High Pressure and High Temperature Conditions Based on Synchrotron X-ray and Neutron Diffraction Experiments Open
View article: Formation of triclusters in silica melt under high pressure
Formation of triclusters in silica melt under high pressure Open
View article: Hydrogen in the Earth core inferred from neutron imaging and diffraction
Hydrogen in the Earth core inferred from neutron imaging and diffraction Open
The density of the Earth’s core is lower than that of pure iron; this is considered to be caused by the presence of light elements in the core. Hydrogen is one of the most important light elements in the Earth’s core because of its high co…
View article: Pressure-induced elongation of hydrogen-oxygen bond in sodium silicate melts
Pressure-induced elongation of hydrogen-oxygen bond in sodium silicate melts Open
View article: Effects of CO<sub>2</sub> on the structure of silicate melts considering the degree of polymerization under pressure
Effects of CO<sub>2</sub> on the structure of silicate melts considering the degree of polymerization under pressure Open
View article: Density deficit of Earth’s core revealed by a multimegabar primary pressure scale
Density deficit of Earth’s core revealed by a multimegabar primary pressure scale Open
An accurate pressure scale is a fundamental requirement to understand planetary interiors. Here, we establish a primary pressure scale extending to the multimegabar pressures of Earth’s core, by combined measurement of the acoustic velocit…
View article: Mantle Melting Phenomena under Hydrous Conditions and Structural Analysis of Hydrous Sodium Silicate Melts
Mantle Melting Phenomena under Hydrous Conditions and Structural Analysis of Hydrous Sodium Silicate Melts Open
View article: Deuterium Content and Site Occupancy in Iron Sulfide at High Pressure and Temperature Determined Using In Situ Neutron Diffraction Measurements
Deuterium Content and Site Occupancy in Iron Sulfide at High Pressure and Temperature Determined Using In Situ Neutron Diffraction Measurements Open
We have performed in situ time‐of‐flight neutron diffraction experiments to examine the uptake of deuterium in iron monosulfide at pressures up to 11.4 GPa and temperatures to 1300 K. A D 2 fluid was formed in the experiments through the d…
View article: A Molecular‐Scale Origin of Shear Thinning and Brittle Failure of Silicate Melt
A Molecular‐Scale Origin of Shear Thinning and Brittle Failure of Silicate Melt Open
Shear thinning and brittle failure of silicate melt control the dynamics of volcanic eruptions, but their molecular‐scale origin is still unclear. Here, we conducted tension and compression experiments on silicate melts, using time‐resolve…
View article: Dataset for "A molecular-scale origin of shear thinning and brittle failure of silicate melt"
Dataset for "A molecular-scale origin of shear thinning and brittle failure of silicate melt" Open
This file is the dataset used in the article "A molecular-scale origin of shear thinning and brittle failure of silicate melt", Geophysical Research Letters.
View article: Neutron diffraction study of hydrous sodium silicate melt at high pressure and high temperature
Neutron diffraction study of hydrous sodium silicate melt at high pressure and high temperature Open
Since silicate melts are generated and stabilized locally in Earth's mantle through the presence of volatiles.Determining the structure of hydrous silicate melts, which is largely different from anhydrous melts, is therefore important to a…
View article: Deuterium content and site occupancy in iron sulphide at high pressure and temperature determined using in situ neutron diffraction measurements - The final structural model for deuterated FeS V - CIF
Deuterium content and site occupancy in iron sulphide at high pressure and temperature determined using in situ neutron diffraction measurements - The final structural model for deuterated FeS V - CIF Open
The CIF file of the final structural model of deuterated FeS V (P63/mmc, Z=2) at 6.9 GPa and 960 K. Refined occupancies of D are in positions; 6h (0.14) and 4f (0.16).The atomic coordinates for the different ato…
View article: Rheology of nanocrystal-bearing andesite magma and its roles in explosive volcanism
Rheology of nanocrystal-bearing andesite magma and its roles in explosive volcanism Open
Recent petrological and experimental studies have proposed that explosive volcanism may originate from the formation of nanoscale crystals in magma and the resultant ductile–brittle transition. However, the rheology of magma with quantifie…
View article: Dataset for "Rheology of nanocrystal-bearing andesite magma and its roles in explosive volcanism"
Dataset for "Rheology of nanocrystal-bearing andesite magma and its roles in explosive volcanism" Open
This file is the dataset used in the article "Rheology of nanocrystal-bearing andesite magma and its roles in explosive volcanism", Communications Earth & Environment.
View article: Sound Velocity Measurements of B2‐Fe‐Ni‐Si Alloy Under High Pressure by Inelastic X‐Ray Scattering: Implications for the Composition of Earth's Core
Sound Velocity Measurements of B2‐Fe‐Ni‐Si Alloy Under High Pressure by Inelastic X‐Ray Scattering: Implications for the Composition of Earth's Core Open
Elastic properties of B2‐Fe 0.67 Ni 0.06 Si 0.27 (15 wt.% Si) alloy have been investigated by combined high‐resolution inelastic X‐ray scattering and powder X‐ray diffraction in diamond anvil cells up to 100 GPa at room temperature. Densit…
View article: Dominijanni et al., 2022 Tables
Dominijanni et al., 2022 Tables Open
Supplementary tables and extended data.
View article: Large density deficit of Earth's core revealed by a multi-megabar primary pressure scale
Large density deficit of Earth's core revealed by a multi-megabar primary pressure scale Open
Precise information about the composition of the Earth's core is critical to understand planetary evolution and for discussing current hot topics in geodynamic behavior, such as core-mantle boundary heat flow. However, samples from deep in…
View article: Deuterium content and site occupancy in iron sulphide at high pressure and high temperature: Implications for the oxidation of early Earth’s mantle
Deuterium content and site occupancy in iron sulphide at high pressure and high temperature: Implications for the oxidation of early Earth’s mantle Open
View article: Elastic properties and structures of pyrope glass under high pressures
Elastic properties and structures of pyrope glass under high pressures Open
X-ray diffraction analysis and ultrasonic measurements of a glass with the pyrope composition were conducted to determine its structural and elastic properties at pressures from 1 atm to 12.9 GPa. Our results indicate that its structural e…
View article: The sound velocity of wüstite at high pressures: implications for low-velocity anomalies at the base of the lower mantle
The sound velocity of wüstite at high pressures: implications for low-velocity anomalies at the base of the lower mantle Open
The longitudinal sound velocity ( V P ) and the density ( ρ ) of wüstite, FeO, were measured at pressures of up to 112.3 GPa and temperatures of up to 1700 K using both inelastic X-ray scattering and X-ray diffraction combined with a laser…
View article: Composition of the Earth&#8217;s inner core from high pressure sound velocity measurements of Fe-Ni-Si alloys
Composition of the Earth’s inner core from high pressure sound velocity measurements of Fe-Ni-Si alloys Open
<p>Earth’s inner core likely consists of Fe-Ni alloy(s) plus a minor fraction of light element(s) to match the density and sound wave velocities of seismological models such as the preliminary reference Earth model (PREM). …
View article: Longitudinal Wave Velocity of Sodium Aluminosilicate Melt at High Pressure
Longitudinal Wave Velocity of Sodium Aluminosilicate Melt at High Pressure Open
View article: Thermal Equation of State of Fe3C to 327 GPa and Carbon in the Core
Thermal Equation of State of Fe3C to 327 GPa and Carbon in the Core Open
The density and sound velocity structure of the Earth’s interior is modeled on seismological observations and is known as the preliminary reference Earth model (PREM). The density of the core is lower than that of pure Fe, which suggests t…
View article: Pressure and Composition Effects on Sound Velocity and Density of Core‐Forming Liquids: Implication to Core Compositions of Terrestrial Planets
Pressure and Composition Effects on Sound Velocity and Density of Core‐Forming Liquids: Implication to Core Compositions of Terrestrial Planets Open
A compositional variety of planetary cores provides insight into their core/mantle evolution and chemistry in the early solar system. To infer core composition from geophysical data, a precise knowledge of elastic properties of core‐formin…
View article: Hydrous magnesium-rich magma genesis at the top of the lower mantle
Hydrous magnesium-rich magma genesis at the top of the lower mantle Open
Several igneous activities occur on the surface of the Earth, including island arcs, mid-ocean ridges and hot spots. Based on geophysical observations, melting phenomena in the interior also occur at the asthenosphere’s top and the upper m…
View article: Sound velocity measurements of ε–FeOOH up to 24 GPa
Sound velocity measurements of ε–FeOOH up to 24 GPa Open
The sound velocity and density of ε–FeOOH have been simultaneously measured up to 24 GPa at room temperature using an ultrasonic pulse–echo–overlap method and a Kawai–type multi–anvil apparatus at BL04B1 in SPring–8. In the experimental pr…
View article: Pressure–induced structural changes of basaltic glass
Pressure–induced structural changes of basaltic glass Open
The structural determinations of basaltic glass under pressure were conducted. The obtained structure factor, S(Q) indicates that the position of the first sharp diffraction peak (FSDP) shifts to higher–Q region with increasing pressure up…
View article: Melting relations in the Fe–S–Si system at high pressure and temperature: implications for the planetary core
Melting relations in the Fe–S–Si system at high pressure and temperature: implications for the planetary core Open
The phase and melting relations in the Fe–S–Si system were determined up to 60 GPa by using a double-sided laser-heated diamond anvil cell combined with X-ray diffraction. On the basis of the X-ray diffraction patterns, we confirmed that h…
View article: Diamond formation in the deep lower mantle: a high-pressure reaction of MgCO3 and SiO2
Diamond formation in the deep lower mantle: a high-pressure reaction of MgCO3 and SiO2 Open
Diamond is an evidence for carbon existing in the deep Earth. Some diamonds are considered to have originated at various depth ranges from the mantle transition zone to the lower mantle. These diamonds are expected to carry significant inf…
View article: Density of jadeite melts under high pressure and high temperature conditions
Density of jadeite melts under high pressure and high temperature conditions Open
The density of the jadeite (NaAlSi2O6) melt has been measured up to 6.5 GPa and 2273 K using the X–ray absorption technique at beamline 13–BM–D of the Advanced Photon Source. A fit of the pressure–density–temperature data to the high tempe…