Article
Chemistry, Physical
L. Havela
Summary: This paper provides a brief overview of the impact of hydrogen presence in metallic systems on magnetic properties, emphasizing the differences between different systems and using materials with similar crystal structures for comparison. The analysis is based on general aspects of hydrogen bonding in a metallic environment, hydrogen expanding volume, and polar bonding of hydrogen. Electronegativity is used as a convenient indicator quantifying the polar bonding character.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Condensed Matter
Brandon Blue, Ryuichi Tsuchikawa, Amin Ahmadi, Zhengyi Zhang, Daniel Heligman, Stephanie D. Lough, James Hone, Eduardo R. Mucciolo, Masa Ishigami
Summary: Previous conductivity measurements on metallic carbon nanotubes have observed unexplainable conductance suppressions, which were previously attributed to the gate dependency of contact resistance. However, new research shows that these phenomena are actually manifestations of Wigner cusps.
SOLID STATE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Peter Arendas, Attila G. Csaszar
Summary: An alternative combinatorial expression for the Wigner numbers is presented, leading to a generating function and new identities. The introduction of an extended class of Wigner numbers of the lth order is also mentioned.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Demeng Feng, Raymond A. Wambold, Yuzhe Xiao, Chenghao Wan, Zhaoning Yu, Victor W. Brar, Mikhail A. Kats
Summary: The researchers proposed a method to enhance the optical pressure on a metal film suspended in free space by structuring it with a periodic array of nanoscale slots. However, their result contradicts the law of momentum conservation. Recalculations of the optical forces show that there was no enhancement, but instead matched the standard radiation-pressure relation.
Article
Multidisciplinary Sciences
Wuhao Chen, Dmitrii Semenok, Alexander G. Kvashnin, Xiaoli Huang, Ivan A. Kruglov, Michele Galasso, Hao Song, Defang Duan, Alexander F. Goncharov, Vitali B. Prakapenka, Artem R. Oganov, Tian Cui
Summary: The study found a new superhydride, BaH12, in the barium-hydrogen system with metallic properties and superconductivity below 1.5 Mbar. This compound contains H-2 and H-3(-) molecular units and detached H-12 chains.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Bjorn Salzmann, Elina Hujala, Catherine Witteveen, Baptiste Hildebrand, Helmuth Berger, Fabian O. von Rohr, Christopher W. Nicholson, Claude Monney
Summary: The transition-metal dichalcogenide tantalum disulphide (1T-TaS2) exhibits a commensurate charge density wave (CCDW) phase below 165 K. This CCDW phase can be transformed into a metastable metallic mosaic phase by laser or voltage pulses. In this study, scanning tunneling microscopy and spectroscopy (STM/STS) were used to observe the occurrence of the metallic mosaic phase on the surface of TaS2 without prior pulse excitation. Surface defects are believed to contribute to the formation of a dense domain wall network, which is responsible for the metallic behavior in the mosaic phase.
PHYSICAL REVIEW MATERIALS
(2023)
Review
Physics, Multidisciplinary
Isaac F. Silvera, Ranga Dias
Summary: Hydrogen, the simplest molecule in nature, has been successfully transformed into metallic hydrogen and liquid atomic metallic hydrogen after decades of research and experimental efforts, bringing new breakthroughs to the scientific community.
ADVANCES IN PHYSICS-X
(2021)
Editorial Material
Multidisciplinary Sciences
Ferdi L. Hellweger, Charlotte Schampera, Robbie M. Martin, Falk Eigemann, Derek J. Smith, Gregory J. Dick, Steven W. Wilhelm
Summary: In response to the criticism by Huisman et al., this article demonstrates that their claims are based on incomplete evidence, misinterpretation of data, or do not actually refute our model. While our model, like any ecosystem models, has its simplifications and uncertainties, it outperforms existing approaches that ignore biology and cannot predict toxin concentration.
Editorial Material
Energy & Fuels
Robert W. Howarth, Mark Z. Jacobson
Summary: This article responds to criticisms of blue hydrogen and strongly disagrees with the view presented by Romano et al. The authors argue that the sources used by Romano et al. are unreliable and that their discussions on methane emissions and carbon dioxide capture lack real-world data. Therefore, the article asserts that blue hydrogen has no place in a decarbonized energy future.
ENERGY SCIENCE & ENGINEERING
(2022)
Article
Energy & Fuels
Chanon Auepattana-aumrung, Supareak Praserthdam, Sippakorn Wannakao, Bunjerd Jongsomjit, Joongjai Panpranot, Piyasan Praserthdam
Summary: Transition metal-loaded catalysts enhance propylene selectivity and improve hydrogen transfer reaction; Lack of strong acid sites on ZSM-5 is a significant factor suppressing the formation of light alkanes; Na-ZSM-5 exhibits the best performance in propylene yield and catalyst stability.
Article
Nanoscience & Nanotechnology
W. Wang, L. Ma, X. Kong, Q. Kang, C. Ding, S. Qin, P. Tang, T. Xu, H. Bi, L. Sun
Summary: This study demonstrates that the stability and electrocatalytic activity of metallic phase two-dimensional MoS2 nanosheets can be significantly improved by decoration with gold nanodots. The findings provide a new approach to stabilize and activate these nanosheets for various applications, such as hydrogen energy production.
MATERIALS TODAY NANO
(2022)
Editorial Material
Chemistry, Physical
Sam Hampton, Tina Fawcett, Jan Rosenow, Charles Michaelis, Ruth Mayne
Summary: Sam Hampton, Tina Fawcett, Jan Rosenow, Charlie Michaelis, and Ruth Mayne are researchers and experts in various aspects of energy policy, sustainability, and climate change. Their focus is on governance of energy transition, energy use in households and organizations, and climate justice research.
Article
Chemistry, Physical
Kari Espegren, Sigrid Damman, Paolo Pisciella, Ingeborg Graabak, Asgeir Tomasgard
Summary: The paper presents a radical decarbonization pathway for Norwegian society towards 2050, focusing on the role of hydrogen in the transition and the potential for establishing an international hydrogen market. The study highlights the importance of access to renewable power and hydrogen in decarbonizing transport and industrial sectors in Norway, while emphasizing that hydrogen is essential for maintaining a high level of economic activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
J. Shen, Y. H. Sun, J. Orava, H. Y. Bai, W. H. Wang
Summary: Liquid-to-liquid transition (LLT) in metallic liquids and its relationship with liquid dynamics were studied through in-situ vitrification, annealing, and heating processes. Isothermal-annealing induced forward and heating initiated reversible LLTs were detected, and the LLT mechanisms were revealed by controlling the annealing temperature. A two-step-like increase in specific heat reflected the coexistence of two distinct liquids. This study not only enhances our understanding of LLTs in metallic and molecular liquids, but also uncovers a unique first-order glass-to-glass transition in multi-component metallic systems.
Article
Chemistry, Physical
Xiaowei Guo, Tong Wu, Siwei Zhao, Yuqiang Fang, Shumao Xu, Miao Xie, Fuqiang Huang
Summary: Metastable two-dimensional transition metal dichalcogenides (TMDs) are ideal electrocatalysts due to their excellent conductivities and high activities. This study developed a unique Re modulation strategy to stabilize ultrathin 2M-WS2 nanosheets and enhance their activity for hydrogen evolution reaction (HER), showcasing a promising electronic modulation method for high-performance HER.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Multidisciplinary Sciences
Wuhao Chen, Dmitrii Semenok, Alexander G. Kvashnin, Xiaoli Huang, Ivan A. Kruglov, Michele Galasso, Hao Song, Defang Duan, Alexander F. Goncharov, Vitali B. Prakapenka, Artem R. Oganov, Tian Cui
Summary: The study found a new superhydride, BaH12, in the barium-hydrogen system with metallic properties and superconductivity below 1.5 Mbar. This compound contains H-2 and H-3(-) molecular units and detached H-12 chains.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Xiao Zhang, Yu Wang, Maxim Bykov, Elena Bykova, Stella Chariton, Vitali B. Prakapenka, Konstantin Glazyrin, Alexander F. Goncharov
Summary: Nitrogen and water react differently at extreme pressure-temperature conditions, forming clathrate compounds below 6 GPa and transforming into a fine grained state above 6 GPa. There is no sign of formation of mixed compounds and no ice doping by nitrogen observed in this study. Size effects in fine grained crystallites result in peculiar Raman spectra in the molecular regime.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Geochemistry & Geophysics
Motohiko Murakami, Alexander F. Goncharov, Nobuyoshi Miyajima, Daisuke Yamazaki, Nicholas Holtgrewe
Summary: The Earth has been releasing vast amounts of heat from its interior to the surface, driving mantle convection and tectonic activities. The radiative thermal conductivity of bridgmanite at the core-mantle boundary has been revealed to be substantially high, leading to a higher heat flow from the core and more vigorous mantle convection than expected. This higher cooling efficiency of the mantle may weaken tectonic activities more rapidly than conventionally believed.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Physics, Applied
Alexander F. Goncharov, Elena Bykova, Maxim Bykov, Xiao Zhang, Yu Wang, Stella Chariton, Vitali B. Prakapenka, Jesse S. Smith
Summary: The study synthesized carbon-rich C-S-H compounds using methane and determined their structure and composition through Raman spectroscopy and single-crystal x-ray diffraction, revealing the presence of methane molecules substituting hydrogen sulfide molecules. The structural behavior of the compounds undergoes transitions at different pressures and demonstrates a distortion into a Pnma structure at 132-159 GPa before transforming into a common H3S phase at higher pressures. However, no structural anomaly is detected near 220 GPa, where a sharp increase in T-c has been reported.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Elissaios Stavrou, Alexander A. Maryewski, Sergey S. Lobanov, Artem R. Oganov, Zuzana Konopkova, Vitali B. Prakapenka, Alexander F. Goncharov
Summary: A combined experimental and theoretical study was conducted on ethane and methane at high pressures, determining their crystal structures, phase transitions, and equation of state. The study resulted in the identification of pressure-induced phase transitions and provided a solid basis for discussing the relative stability of these compounds at high pressures.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Vitali B. Prakapenka, Nicholas Holtgrewe, Sergey S. Lobanov, Alexander F. Goncharov
Summary: Experimental measurements under high pressure and high temperature revealed distinct superionic ice phases with different lattice structures, confirming the theoretical predictions. The results provide insights into the phase diagram of water and the potential presence of superionic ice in water-rich giant planets.
Article
Materials Science, Multidisciplinary
Alexander F. Goncharov, Elena Bykova, Maxim Bykov, Eric Edmund, Jesse S. Smith, Stella Chariton, Vitali B. Prakapenka
Summary: We studied the stability of polymeric CO2 under various pressures, temperatures, and chemical environments. The I (4) over bar 2d polymeric structure, composed of a three-dimensional network of corner sharing CO4 tetrahedra, was found to form at 40-140 GPa and from a CO-N-2 mixture at 39 GPa. This structure exhibits exceptional stability in the range of 0-286 GPa and 100-2500 K, making it a viable candidate for planetary interiors. The stability of the tetrahedral polymeric motif of CO2-V is attributed to the rigid sp(3) hybridized orbitals of carbon in a closed-packed oxygen sublattice.
PHYSICAL REVIEW MATERIALS
(2023)
Editorial Material
Physics, Multidisciplinary
Alexander F. Goncharov, Vitali B. Prakapenka
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Grace P. Chen, Elena Bykova, Maxim Bykov, Eric Edmund, Zi-Yu Cao, Xiao-Jia Chen, Jesse S. Smith, Stella Chariton, Vitali B. Prakapenka, Alexander F. Goncharov
Summary: The high-pressure properties of layered transition metal dichalcogenide 2H-NbSe2 were investigated, revealing its structural stability up to 35 GPa. The lattice compressibility changes from anisotropic to isotropic with increasing pressure. The compression behavior of interatomic bonds is highly anisotropic, while the intramolecular bonds show a nonmonotonic pressure dependence with a maximum at -12 GPa.
Review
Physics, Applied
Yan Zhou, Zuo-Yuan Dong, Wen-Pin Hsieh, Alexander F. Goncharov, Xiao-Jia Chen
Summary: The measurement of thermal conductivity and understanding of thermal transport mechanisms under high pressure are challenging but important. Breakthroughs in high-pressure experimental techniques have enabled in situ measurements of thermal conductivity and provided insights into thermal transport mechanisms. This Review discusses recent progress in characterization techniques, determination of thermal conductivity, and the applications of high-pressure experiments.
NATURE REVIEWS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Maxim Bykov, Elena Bykova, Chris J. Pickard, Miguel Martinez-Canales, Konstantin Glazyrin, Jesse S. Smith, Alexander F. Goncharov
Summary: The study identified the structure of the high-pressure phase of molecular methane using single-crystal synchrotron x-ray diffraction, Raman spectroscopy, and first principles calculations. It revealed the relationship between the high-pressure phase and the previously documented phase B, and determined the positions of hydrogen atoms through calculations. The study's findings differ from previous proposals of multiple high-pressure phases based solely on Raman spectroscopy results.
Article
Materials Science, Multidisciplinary
Ge Huang, Zi-Yu Cao, Tian-Ran Wei, Alexander F. Goncharov, Konstantin Glazyrin, Hao Yu, Xun Shi, Li-Dong Chen, Xiao-Jia Chen
Summary: In this study, the researchers investigated the phase evolution of a phase-change alloy Ge2Sb2Te5 under pressure, and observed superconductivity in the compressed phases that can be maintained at nearly ambient pressure during decompression. The findings suggest that pressure-induced disorder is crucial for holding superconductivity in the compressed phase-change alloy.
Article
Materials Science, Multidisciplinary
Elena Bykova, Maxim Bykov, Stella Chariton, Vitali B. Prakapenka, Konstantin Glazyrin, Andrey Aslandukov, Alena Aslandukova, Giacomo Criniti, Alexander Kurnosov, Alexander F. Goncharov
Summary: The study synthesized two C-S-H compounds from mixtures of carbon and sulfur in hydrogen or sulfur in mixed methane-hydrogen fluids under high pressure conditions. X-ray synchrotron single-crystal diffraction and Raman spectroscopy were used to analyze the structural changes of these compounds under different pressures. The results showed that the structure and symmetry of the compounds evolved with varying pressure, suggesting differences from the common Im-3m H3S structure.
Article
Chemistry, Inorganic & Nuclear
Maxim Bykov, Elena Bykova, Stella Chariton, Vitali B. Prakapenka, Iskander G. Batyrev, Mohammad F. Mahmood, Alexander F. Goncharov
Summary: The synthesis and characterization of nitrogen-rich materials is crucial for designing novel high energy density materials. The formation of oxygen-free pentazolate salts Na2N5, NaN5 and NaN5 center dot N-2 from NaN3 and N-2 at around 50 GPa demonstrates the potential for great compositional diversity and self-templated synthesis of metal-pentazolate frameworks.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Xiao-Miao Zhao, Kai Zhang, Zi-Yu Cao, Zhi-Wei Zhao, Viktor V. Struzhkin, Alexander F. Goncharov, Hai-Kuo Wang, Alexander G. Gavriliuk, Ho-Kwang Mao, Xiao-Jia Chen
