Article
Geochemistry & Geophysics
T. Matsumura, Y. Kuwayama, K. Ueki, T. Kuwatani, Y. Ando, K. Nagata, S. Ito, H. Nagao
Summary: The study uses Bayesian modeling of the equation of state to estimate the density and P wave velocity of liquid iron in Earth's outer core, providing credible intervals for the deviations from the preliminary reference Earth model. The Bayesian modeling allows integration of small data sets including unobserved data and evaluation of uncertainty ranges of physical properties essential for comparison with seismological properties of the core.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Daniel A. Frost, Marine Lasbleis, Brian Chandler, Barbara Romanowicz
Summary: The progressive crystallization of Earth's inner core drives convection in the outer core and magnetic field generation. Determining the rate and pattern of inner-core growth is crucial to understanding the evolution of the geodynamo. Seismic observations show that the strength of seismic anisotropy within the inner core increases with depth, with the strongest anisotropy offset from Earth's rotation axis.
Article
Chemistry, Physical
Chao Yang, Qian Wang, Mingxing Wang, Yao Wang, Rui Du, Jichuan Dai, Yigang Yan, Yungui Chen, Chaoling Wu
Summary: In this study, Vanadium-based body-centered-cubic (BCC) alloys with three different V contents were prepared and their microstructures and hydrogen ab-/desorption properties were investigated. The results showed that the increment of V content improved the elastic properties of the alloy, resulting in higher hydrogen storage capacity and better cyclic durability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Physics, Multidisciplinary
Zilin Cui, Xin Zhang, Yuhong Xu, Guangjiu Lei, Changjian Tang, Xi Chen, Heng Li, Yangyang Liu, Yiqin Zhu, Ming Li, Shaofei Geng, Qijun Liu, Yuxiang Ni, Haifeng Liu, Xianqu Wang, Jie Huang, Hai Liu, Jun Cheng
Summary: In this study, the lattice structure, mechanical properties, electronic structure, and thermodynamic properties of W1-xVx alloys were calculated and simulated. The addition of vanadium was found to increase the ductility while decreasing the strength of the alloys. These results can serve as a reference for selecting plasma facing materials in fusion reactor design.
Article
Physics, Condensed Matter
Jinyu Qiao, Fangfang Wu, Huanming Chen, Zekun Yang, Ruyang Yan, Hongcun Bai, Fengchun Pan, Xueling Lin
Summary: The electronic, elastic and thermodynamic properties of MNi3 (M = Be, Mg, Ca) were investigated, as well as the influence of pressure and strain on elastic properties. It was found that these compounds exhibit metallic behavior, with the metal attribute index in the order of BeNi3 < MgNi3.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Chao Chang, Hui Zhang
Summary: This study systematically investigated the structural stability, elastic properties, and thermodynamic properties of FeAlNixCrMn high-entropy alloys, showing that the Ni content has a significant influence on the alloy's properties. The research provides theoretical guidance for the design and performance prediction of high-entropy alloy components.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nuclear Science & Technology
Xiaoyong Yang, Pavel A. Korzhavyi, Yang Liu, Qianglin Wei, Temirlan R. Arslanov, John P. A. Waerna, Yu Yang, Ping Zhang
Summary: In this study, the properties of U3Si, U3Si2, and USi compounds were systematically investigated, and the reaction energies between them were calculated. The results showed that under appropriate conditions, the formation of USi is more likely to occur, while high temperature and sufficient uranium environment are more favorable for the formation of U3Si.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Engineering, Multidisciplinary
Dai Rui, Dong Chunying, Xu Chuang, Sun Deyong
Summary: The paper applies the IGABEM to study the mechanical properties of the elastic matrix with liquid inclusions, solving strong and weak singular integrals in 2D problems using SST and Tells transformation method, and carrying out various singular integrals in 3D problems using power series expansion method. The randomly distributed liquid inclusions are generated using OBB, demonstrating the accuracy and effectiveness of the method in studying liquid inclusions.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Chemistry, Physical
Jong Hyun Jung, Prashanth Srinivasan, Axel Forslund, Blazej Grabowski
Summary: Accurate prediction of thermodynamic properties requires a precise representation of the free-energy surface, including finite-temperature mechanisms and dense volume-temperature grid calculations. A new framework involving direct upsampling, thermodynamic integration, and machine-learning potentials is introduced, which greatly improves computational efficiency and reliability. The method has been applied to calculate equilibrium thermodynamic properties for several materials and shows remarkable agreement with experimental data, particularly emphasizing the impact of anharmonicity for Nb. This procedure paves the way for developing ab initio thermodynamic databases.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Bo Gyu Jang, Yu He, Ji Hoon Shim, Ho-kwang Mao, Duck Young Kim
Summary: The Earth's inner core is composed primarily of iron and some light elements, but studying its structure and properties has been challenging due to the extreme pressure and temperature conditions required. In this study, it was found that the presence of oxygen enhances the electron correlation effect and affects important features, such as the stability of iron oxides. Oxygen stabilizes hexagonal-structured iron and induces elastic anisotropy under inner core conditions. The electrical resistivity is significantly increased due to the enhanced electron correlation effect, supporting the conventional thermal convection model. Additionally, the calculated seismic velocity matches well with geologically observed data, suggesting that oxygen is a crucial light element for understanding and modeling Earth's inner core.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Polymer Science
Kyeongmin Hong, Minjae Choe, Seoyeon Kim, Hye-Min Lee, Byung-Joo Kim, Sungjune Park
Summary: The study presents a soft and ultrastretchable fiber with a magnetic liquid metal core for electrical switches used in remote magnetic actuation. By mixing with magnetic iron particles, the magnetic liquid metal core maintains electrical conductivity and magnetic property.
Article
Geochemistry & Geophysics
S. C. Grant, T. Ao, C. T. Seagle, A. J. Porwitzky, J. -P. Davis, K. R. Cochrane, D. H. Dolan, J. -F. Lin, T. Ditmire, A. C. Bernstein
Summary: The study utilizes dynamic compression to explore the high-pressure liquid equation of state of iron, contributing new information on the conditions similar to the Earth's outer-inner core boundary for planetary modeling. The technique of shock-ramp capability enables measurements off the Hugoniot, providing valuable data for isentropic, off-Hugoniot experiments in planetary studies. The results are in agreement with previous equations of state and provide updated parameters for liquid iron cores in exoplanetary interiors.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Mathematics, Applied
Simon Blatt, Christopher Hopper, Nicole Vorderobermeier
Summary: This article proves the long-time existence of the negative L-2-gradient flow of p-elastic energy, and demonstrates the convergence of solutions through regularization and subconvergence.
ADVANCES IN NONLINEAR ANALYSIS
(2022)
Article
Environmental Sciences
Huiping Zeng, Longxue Zhai, Jie Zhang, Dong Li
Summary: A novel core-shell magnetic nanoparticle synthesized from iron-containing water treatment residuals was successfully utilized for the removal of As(V) from water. Characterization and experimental results showed that the nanoparticle exhibited good adsorption behavior towards As(V) and maintained high adsorption capacity under different conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
M. N. Magomedov
Summary: The lattice properties of the disordered fcc-Au-Fe substitution alloy were calculated using the Mie-Lennard-Jones interatomic potential. It was found that with an isothermal-isobaric decrease in the size of a nanocrystal, some of its properties change accordingly.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Multidisciplinary Sciences
Sebastian Ritterbex, Taku Tsuchiya
SCIENTIFIC REPORTS
(2020)
Article
Physics, Multidisciplinary
Guoyin Shen, Yanbin Wang, Agnes Dewaele, Christine Wu, Dayne E. Fratanduono, Jon Eggert, Stefan Klotz, Kamil F. Dziubek, Paul Loubeyre, Oleg Fat'yanov, Paul D. Asimow, Tsutomu Mashimo, Renata M. M. Wentzcovitch, Jay Bass, Yan Bi, Duanwei He, Konstantin Khishchenko, Kurt Leinenweber, Baosheng Li, Takeshi Sakai, Taku Tsuchiya, Katsuya Shimizu, Daisuke Yamazaki, Mohamed Mezouar
HIGH PRESSURE RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Tingting Gu, Sebastian Ritterbex, Taku Tsuchiya, Wuyi Wang
DIAMOND AND RELATED MATERIALS
(2020)
Article
Geosciences, Multidisciplinary
Zhihua Xiong, Taku Tsuchiya, James A. Van Orman
Summary: The Earth's core may be a reservoir for He-3, but is unlikely to be a significant source for Ar-36. The partitioning behaviors of He and Ar between liquid metal and silicate melt during core formation are influenced by pressure.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Longjian Xie, Akira Yoneda, Tomoo Katsura, Denis Andrault, Yoshinori Tange, Yuji Higo
Summary: Research suggests that the persistence of primitive reservoirs in the Earth's lower mantle indicates heterogeneity. Low viscosity favors fractional solidification and chemical layering in the early mantle, potentially a source of heterogeneity in the modern mantle.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Takuo Okuchi, Yusuke Seto, Naotaka Tomioka, Takeshi Matsuoka, Bruno Albertazzi, Nicholas J. Hartley, Yuichi Inubushi, Kento Katagiri, Ryosuke Kodama, Tatiana A. Pikuz, Narangoo Purevjav, Kohei Miyanishi, Tomoko Sato, Toshimori Sekine, Keiichi Sueda, Kazuo A. Tanaka, Yoshinori Tange, Tadashi Togashi, Yuhei Umeda, Toshinori Yabuuchi, Makina Yabashi, Norimasa Ozaki
Summary: This study reveals a nanosecond transformation mechanism that produces ringwoodite, the most typical high-pressure mineral in meteorites. It suggests that even apparently unshocked meteorites could contain evidence of high-pressure states from past collisions.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Chao Liu, Takashi Yoshino, Daisuke Yamazaki, Noriyoshi Tsujino, Hitoshi Gomi, Moe Sakurai, Youyue Zhang, Ran Wang, Longli Guan, Kayan Lau, Yoshinori Tange, Yuji Higo
Summary: The anelastic measurement method using cyclic loading under high pressure has been developed with in situ X-ray observation at a synchrotron facility. Flexible graphite as a reference material shows better performance compared to dense polycrystalline alumina and alumina single crystal, exhibiting lower attenuation and higher strain ratio, making it more suitable for detecting lower energy dispersion of mantle minerals at high pressure.
HIGH PRESSURE RESEARCH
(2022)
Article
Instruments & Instrumentation
Longjian Xie, Artem Chanyshev, Takayuki Ishii, Dmitry Bondar, Keisuke Nishida, Zhen Chen, Shrikant Bhat, Robert Farla, Yuji Higo, Yoshinori Tange, Xiaowan Su, BingMin Yan, Shuailin Ma, Tomoo Katsura
Summary: The study successfully generated ultrahigh pressure and temperature simultaneously using a multi-anvil apparatus with sintered diamond (SD) and boron-doped diamond (BDD) technology. The combination of SD anvils and a BDD heater with advanced multi-anvil technology is expected to lead to even higher pressure generation in the future.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Geosciences, Multidisciplinary
Longli Guan, Daisuke Yamazaki, Noriyoshi Tsujino, Yoshinori Tange, Yuji Higo
Summary: Through experiments, the study observed the lattice preferred orientation contributing to seismic anisotropy, indicating akimotoite is one of the dominant minerals near the subducting slabs in the lower mantle transition zone, suggesting its lattice preferred orientation may explain the observed seismic anisotropy.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Physics, Condensed Matter
Taku Tsuchiya, Saito Nakagawa
Summary: The high-pressure behavior of SiO2 is a key subject in various research areas. Researchers have shown a new structure directly converted from alpha-quartz under uniaxial compression and elucidated a simple transition pathway to the Fe2P-type phase. An intermediate state with the Li2ZrF6-type structure has been discovered, with some interesting properties. The Li2ZrF6-type phase is found to be metastable at lower pressures but becomes energetically stable than alpha-quartz at around 12 GPa, suggesting potential applications in ambient conditions.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Multidisciplinary Sciences
Noriyoshi Tsujino, Daisuke Yamazaki, Yu Nishihara, Takashi Yoshino, Yuji Higo, Yoshinori Tange
Summary: To understand mantle dynamics, it is important to determine the rheological properties of bridgmanite, the dominant mineral in Earth's mantle. Experimental data on the viscosity of bridgmanite are limited, but our in situ stress-strain measurements and deformation apparatuses provide viscosity and deformation mechanism maps of bridgmanite at the uppermost lower mantle conditions. The results show that bridgmanite is the hardest mineral even under dry conditions, and the lower mantle is isolated from the convecting mantle.
Article
Geosciences, Multidisciplinary
Tomoaki Kubo, Ko Kamura, Masahiro Imamura, Yoshinori Tange, Yuji Higo, Masaaki Miyahara
Summary: In this study, back-transformation experiments were conducted on ringwoodite, bridgmanite, and lingunite, revealing different kinetics of the back-transformation process. The findings are significant for understanding back-transformation in shocked meteorites and the formation of hydrous ringwoodite in diamond inclusions.
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Satoshi Ohmura, Fuyuki Shimojo, Taku Tsuchiya
Summary: The structural and bonding properties of liquid iron-light-element-oxygen ternary systems are studied using ab initio molecular dynamics simulations. H, C, O, Si, and S are investigated as light elements in the Earth's outer core. The simulations reveal that H, C, and O exhibit interstitial behavior while Si and S show substitutional behavior. Covalent-like interactions are observed between C-C, Si-Si, and Si-O, even under high-pressure conditions. The covalent bond between Si and O leads to a positive shift in Si's ionic charge, which may relate to the immiscibility of liquid Fe-Si-O.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Physics, Condensed Matter
Haruhiko Dekura, Taku Tsuchiya
Summary: The effects of iron incorporation on the lattice thermal conductivity of MgO under high pressure and temperature conditions were investigated using density-functional theory and anharmonic lattice dynamics theory. The lattice thermal conductivity of ferropericlase was determined using the LDA + U method and phonon Boltzmann transport equation. The results showed that the incorporation of iron significantly decreased the lattice thermal conductivity of MgO.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Masamichi Noda, Toru Inoue, Taku Tsuchiya, Yuji Higo
Summary: A new method for precisely measuring elastic wave velocity is developed by combining in situ synchrotron X-ray technique and ultrasonic interferometry with a Kawai type multi-anvil apparatus. The validation using literature data and new elastic constant data of gold shows that the corrected elastic wave velocities are in good agreement with experimental measurements and calculations. The correction for the bond effect is highly important, particularly when the sample length is less than 1 mm.
HIGH PRESSURE RESEARCH
(2022)
