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Hai Y, Jiang M, Tian H, Zhong G, Li W, Yang C, Chen X, Lin H. Superconductivity Above 100 K Predicted in Carbon-Cage Network. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303639. [PMID: 37807820 PMCID: PMC10667821 DOI: 10.1002/advs.202303639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 08/22/2023] [Indexed: 10/10/2023]
Abstract
To explore carbide superconductors with higher transition temperature, two novel carbon structures of cage-network are designed and their superconductivity is studied by doping metals. MC6 and MC10 are respectively identified as C24 and C32 cage-network structures. This study finds that both carbon structures drive strong electron-phonon interaction and can exhibit superconductivity above liquid nitrogen temperature. Importantly, the superconducting transition temperatures above 100 K are predicted to be achieved in C24 -cage-network systems doped by Na, Mg, Al, In, and Tl at ambient pressure, which is far higher than those in graphite, fullerene, and other carbides. Meanwhile, the superconductivity of cage-network carbides is also found to be sensitive to the electronegativity and concentration of dopant M. The result indicates that the higher transition temperatures can be obtained by optimizing the carbon-cage-network structures and the doping conditions. The study suggests that the carbon-cage-network structure is a direction to explore high-temperature superconducting carbides.
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Affiliation(s)
- Yu‐Long Hai
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- Nano Science and Technology InstituteUniversity of Science and Technology of ChinaSuzhou215123China
| | - Meng‐Jing Jiang
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- Nano Science and Technology InstituteUniversity of Science and Technology of ChinaSuzhou215123China
| | - Hui‐Li Tian
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- Nano Science and Technology InstituteUniversity of Science and Technology of ChinaSuzhou215123China
| | - Guo‐Hua Zhong
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- University of Chinese Academy of SciencesBeijing100049China
| | - Wen‐Jie Li
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- University of Chinese Academy of SciencesBeijing100049China
| | - Chun‐Lei Yang
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- University of Chinese Academy of SciencesBeijing100049China
| | - Xiao‐Jia Chen
- School of ScienceHarbin Institute of TechnologyShenzhen518055China
- Center for High Pressure Science and Technology Advanced ResearchShanghai201203China
| | - Hai‐Qing Lin
- School of PhysicsZhejiang UniversityHangzhou310058China
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Tao YL, Zeng W, Gao J, Liu ZT, Jiao Z, Liu QJ. Composition and structural characteristics of compressed alkaline earth metal hydrides. Phys Chem Chem Phys 2023; 25:26225-26235. [PMID: 37740369 DOI: 10.1039/d3cp03134a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
The metallization of alkaline earth metal hydrides offers a way to achieve near-room temperature superconductivity. In order to explore the metallization mechanism of these hydrides under pressure, a detailed understanding of the property changes of alkaline earth metal hydrides is required. Based on first-principles calculations, we have systematically investigated the dihydrides (XH2, X = Be, Mg, Ca, Sr, Ba) and tetrahydrides (XH4, X = Mg, Ca, Sr, Ba) of alkaline earth metals, respectively. By applying external pressure, we show that the structures of these alkaline earth metal hydrides undergo a series of phase transitions. Moreover, we investigate how the size of the bandgap decreases and eventually closes and reveal the role of electronegativity of metal elements in the critical pressure of hydride metallization. Remarkably, the hydrogen units (H6 or H8) formed in XH4 can accelerate the metallization process. The increase of the energy level difference in hydrogen units promotes the electroacoustic coupling effect, which is conducive to realization of high superconducting transition temperature (Tc). Our theoretical findings identify MgH4-I4/mmm as having potential to be a high-temperature superconductor and provide unusual ideas for the search of unknown high-temperature superconducting materials.
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Affiliation(s)
- Ya-Le Tao
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
| | - Wei Zeng
- Teaching and Research Group of Chemistry, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 610075, People's Republic of China
| | - Juan Gao
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
| | - Zheng-Tang Liu
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Zhen Jiao
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
| | - Qi-Jun Liu
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
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Li WH, Yang WH, Lu WC. Pressure-induced superconductivity of Ac-B-H hydrides. Phys Chem Chem Phys 2023; 25:22032-22039. [PMID: 37555344 DOI: 10.1039/d3cp02099a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
The search for room-temperature superconductors among high-pressure hydrides is a hot research topic. In this study, the structures, stabilities and superconducting properties of ternary Ac-B-H hydrides were studied using a genetic algorithm (GA) combined with density functional theory (DFT) calculations. It was shown that the R3̄m-AcBH8 and I4/mmm-AcB2H8 structures were thermodynamically and dynamically stable above 70 and 125 GPa, respectively. In the R3̄m-AcBH8 structure, the BH6 unit and the dispersed H atoms were bonded to form a corrugated structure. The I4/mmm-AcB2H8 structure contained a cage and the Ac atom located at the cage center. The calculations of the electron-phonon coupling showed that the R3̄m-AcBH8 and I4/mmm-AcB2H8 structures had Tc values of 140 K (70 GPa) and 99 K (125 GPa), respectively. The analyses of the phonon dispersion curves revealed that electron-phonon coupling was closely related to the vibrations of the B-H bonds.
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Affiliation(s)
- Wen-Hua Li
- College of Physics, Qingdao University, Qingdao, Shandong 266071, P. R. China.
| | - Wen-Hua Yang
- College of Physics, Qingdao University, Qingdao, Shandong 266071, P. R. China.
| | - Wen-Cai Lu
- College of Physics, Qingdao University, Qingdao, Shandong 266071, P. R. China.
- Institute of Theoretical Chemistry, Jilin University, Changchun, Jilin 130021, P. R. China
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Havela L, Legut D, Kolorenč J. Hydrogen in actinides: electronic and lattice properties. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2023; 86:056501. [PMID: 36821855 DOI: 10.1088/1361-6633/acbe50] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Hydrides of actinides, their magnetic, electronic, transport, and thermodynamic properties are discussed within a general framework of H impact on bonding, characterized by volume expansion, affecting mainly the 5fstates, and a charge transfer towards H, which influences mostly the 6dand 7sstates. These general mechanisms have diverse impact on individual actinides, depending on the degree of localization of their 5fstates. Hydrogenation of uranium yields UH2and UH3, binary hydrides that are strongly magnetic due to the 5fband narrowing and reduction of the 5f-6dhybridization. Pu hydrides become magnetic as well, mainly as a result of the stabilization of the magnetic 5f5state and elimination of the admixture of the non-magnetic 5f6component.Ab-initiocomputational analyses, which for example suggest that the ferromagnetism ofβ-UH3is rather intricate involving two non-collinear sublattices, are corroborated by spectroscopic studies of sputter-deposited thin films, yielding a clean surface and offering a variability of compositions. It is found that valence-band photoelectron spectra cannot be compared directly with the 5fnground-state density of states. Being affected by electron correlations in the excited final states, they rather reflect the atomic 5fn-1multiplets. Similar tendencies can be identified also in hydrides of binary and ternary intermetallic compounds. H absorption can be used as a tool for fine tuning of electronic structure around a quantum critical point. A new direction is represented by actinide polyhydrides with a potential for high-temperature superconductivity.
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Affiliation(s)
- Ladislav Havela
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
| | - Dominik Legut
- IT4Innovations, VŠB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech Republic
| | - Jindřich Kolorenč
- Institute of Physics (FZU), Czech Academy of Sciences, Na Slovance 2,182 00 Prague, Czech Republic
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Liu Y, Huang H, Yuan J, Zhang Y, Feng H, Chen N, Li Y, Teng J, Jin K, Xue D, Su Y. Upper limit of the transition temperature of superconducting materials. PATTERNS (NEW YORK, N.Y.) 2022; 3:100609. [PMID: 36419453 PMCID: PMC9676523 DOI: 10.1016/j.patter.2022.100609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 08/05/2022] [Accepted: 09/21/2022] [Indexed: 11/12/2022]
Abstract
Why are the transition temperatures (T c) of superconducting materials so different? The answer to this question is not only of great significance in revealing the mechanism of high-T c superconductivity but also can be used as a guide for the design of new superconductors. However, so far, it is still challenging to identify the governing factors affecting the T c. In this work, with the aid of machine learning and first-principles calculations, we found a close relevance between the upper limit of the T c and the energy-level distribution of valence electrons. It implies that some additional inter-orbital electron-electron interaction should be considered in the interpretation of high-T c superconductivity.
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Affiliation(s)
- Yang Liu
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Haiyou Huang
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Jie Yuan
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yan Zhang
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Hongyuan Feng
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Ning Chen
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Yang Li
- Department of Engineering Science and Materials, University of Puerto Rico, Mayaguez, PR 00681-9000, USA
| | - Jiao Teng
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Kui Jin
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Dezhen Xue
- State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
| | - Yanjing Su
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
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6
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Sun Y, Miao M. Chemical templates that assemble the metal superhydrides. Chem 2022. [DOI: 10.1016/j.chempr.2022.10.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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7
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Sun Y, Sun S, Zhong X, Liu H. Prediction for high superconducting ternary hydrides below megabar pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:505404. [PMID: 36261034 DOI: 10.1088/1361-648x/ac9bba] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
The recent findings of high-temperature hydrides ushered a new era of superconductivity research under high pressure. However, the stable pressure for these remarkable hydrides remains extremely high. In this work, we performed the extensive simulations on a series of hydrides with the prototype structure of UH8and UH7. Our results indicate several compounds possess superconducting critical temperature (Tc) above liquid nitrogen temperature below 100 GPa, such as CeBeH8and ThBeH8that are dynamical stable with aTcof 201 K at 30 GPa and aTcof 98 K at 10 GPa, respectively. Further formation enthalpy calculations suggest that thermodynamical stable pressure of CeBeH8and ThBeH8compounds is above 50 GPa and 88 GPa with respect to binary compounds and solid elements. Moreover, we also found that ThBeH7could be dynamically stable down to 20 GPa with aTcof 70 K. Our further simulations suggested this newly predicted ThBeH7is thermodynamically stable above pressure of 33 GPa with respect to binary compounds and solid elements. The present results shed light on future design and discovery of high-temperature superconductor at moderate pressure.
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Affiliation(s)
- Yao Sun
- International Center for Computational Method & Software and State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Shuai Sun
- Engineering Training Center, Jilin University, Changchun, Jilin, People's Republic of China
| | - Xin Zhong
- International Center for Computational Method & Software and State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Hanyu Liu
- International Center for Computational Method & Software and State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, People's Republic of China
- International Center of Future Science, Jilin University, Changchun 130012, People's Republic of China
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8
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Hilleke KP, Zurek E. Rational Design of Superconducting Metal Hydrides via Chemical Pressure Tuning**. Angew Chem Int Ed Engl 2022; 61:e202207589. [DOI: 10.1002/anie.202207589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Katerina P. Hilleke
- Department of Chemistry State University of New York at Buffalo Buffalo NY 14260-3000 USA
| | - Eva Zurek
- Department of Chemistry State University of New York at Buffalo Buffalo NY 14260-3000 USA
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9
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Hilleke K, Zurek E. Rational Design of Superconducting Metal Hydrides via Chemical Pressure Tuning. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Katerina Hilleke
- State University of New York at Buffalo: University at Buffalo Department of Chemistry 359 Natural Sciences ComplexUniversity at Buffalo, North Campus 14260-3000 Buffalo UNITED STATES
| | - Eva Zurek
- University at Buffalo, State University of New York Department of Chemistry 331 Natural Sciences Complex 14260 Buffalo UNITED STATES
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10
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Superconductivity above 200 K discovered in superhydrides of calcium. Nat Commun 2022; 13:2863. [PMID: 35606357 PMCID: PMC9126910 DOI: 10.1038/s41467-022-30454-w] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 04/27/2022] [Indexed: 11/28/2022] Open
Abstract
Searching for superconductivity with Tc near room temperature is of great interest both for fundamental science & many potential applications. Here we report the experimental discovery of superconductivity with maximum critical temperature (Tc) above 210 K in calcium superhydrides, the new alkali earth hydrides experimentally showing superconductivity above 200 K in addition to sulfur hydride & rare-earth hydride system. The materials are synthesized at the synergetic conditions of 160~190 GPa and ~2000 K using diamond anvil cell combined with in-situ laser heating technique. The superconductivity was studied through in-situ high pressure electric conductance measurements in an applied magnetic field for the sample quenched from high temperature while maintained at high pressures. The upper critical field Hc(0) was estimated to be ~268 T while the GL coherent length is ~11 Å. The in-situ synchrotron X-ray diffraction measurements suggest that the synthesized calcium hydrides are primarily composed of CaH6 while there may also exist other calcium hydrides with different hydrogen contents. The discovery of superconductivity in hydrides at critical temperature (Tc) near room temperature receives intensive attentions. Here the authors report experimental synthesis and discovery of superconductivity with Tc above 210 K in calcium superhydrides at 160–190 GPa.
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11
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Exploring the Effect of the Number of Hydrogen Atoms on the Properties of Lanthanide Hydrides by DMFT. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12073498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Lanthanide hydrogen-rich materials have long been considered as one of the candidates with high-temperature superconducting properties in condensed matter physics, and have been a popular topic of research. Attempts to investigate the effects of different compositions of lanthanide hydrogen-rich materials are ongoing, with predictions and experimental studies in recent years showing that substances such as LaH10, CeH9, and LaH16 exhibit extremely high superconducting temperatures between 150–250 GPa. In particular, researchers have noted that, in those materials, a rise in the f orbit character at the Fermi level combined with the presence of hydrogen vibration modes at the same low energy scale will lead to an increase in the superconducting transition temperature. Here, we further elaborate on the effect of the ratios of lanthanide to hydrogen in these substances with the aim of bringing more clarity to the study of superhydrides in these extreme cases by comparing a variety of lanthanide hydrogen-rich materials with different ratios using the dynamical mean-field theory (DMFT) method, and provide ideas for later structural predictions and material property studies.
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12
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Li S, Ye X, Feng C, Wang Y, Gao T, Ao B, Li D, Zhang G. Pressure-induced evolution of crystal and electronic structure of neptunium hydrides. Phys Chem Chem Phys 2022; 24:4916-4924. [PMID: 35137738 DOI: 10.1039/d1cp05467h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An extensive exploration of high-pressure phase diagrams of NpHx (x = 1-10) compounds was performed by using swarm-intelligence-based CALYPSO structure searches. We propose five stable hydrogen-rich clathrate phases (P4/nmm-NpH5, Cmcm-NpH7, Fm3̄m-NpH8, P63/mmc-NpH9, and Fm3̄m-NpH10) that are composed of unusual H cages with stoichiometries H20, H24, H29, and H32 in which the H atoms are weakly covalently bonded to one another, with neptunium atoms occupying centers of the cages. The electronic structure analyses show that these predicted hydrogen-rich structures are all metallic phases, and Np-H and H-H bonds are formed by ionic and covalent bond interactions, respectively. The charge transfer from the Np atom plays an important role in the stability of the proposed structures. All hydrogen-rich clathrate structures show superconductivity behavior in their respective stability pressure range. Our work is an important step in understanding the phase stability and bonding behavior of NpHx under extreme conditions and provides a valuable reference for experimental synthesis and identification of cage-like neptunium hydrides.
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Affiliation(s)
- Shichang Li
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.
| | - Xiaoqiu Ye
- Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, 621908, China
| | - Chunbao Feng
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.
| | - Yilin Wang
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.
| | - Tao Gao
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China
| | - Bingyun Ao
- Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, 621908, China
| | - Dengfeng Li
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China. .,Institute for Advanced Sciences, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China
| | - Gang Zhang
- Institute of High Performance Computing, A*STAR, 138632, Singapore.
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Xu M, Li Y, Ma Y. Materials by design at high pressures. Chem Sci 2022; 13:329-344. [PMID: 35126967 PMCID: PMC8729811 DOI: 10.1039/d1sc04239d] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 12/08/2021] [Indexed: 01/29/2023] Open
Abstract
Pressure, a fundamental thermodynamic variable, can generate two essential effects on materials. First, pressure can create new high-pressure phases via modification of the potential energy surface. Second, pressure can produce new compounds with unconventional stoichiometries via modification of the compositional landscape. These new phases or compounds often exhibit exotic physical and chemical properties that are inaccessible at ambient pressure. Recent studies have established a broad scope for developing materials with specific desired properties under high pressure. Crystal structure prediction methods and first-principles calculations can be used to design materials and thus guide subsequent synthesis plans prior to any experimental work. A key example is the recent theory-initiated discovery of the record-breaking high-temperature superhydride superconductors H3S and LaH10 with critical temperatures of 200 K and 260 K, respectively. This work summarizes and discusses recent progress in the theory-oriented discovery of new materials under high pressure, including hydrogen-rich superconductors, high-energy-density materials, inorganic electrides, and noble gas compounds. The discovery of the considered compounds involved substantial theoretical contributions. We address future challenges facing the design of materials at high pressure and provide perspectives on research directions with significant potential for future discoveries.
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Affiliation(s)
- Meiling Xu
- Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University Xuzhou 221116 China
| | - Yinwei Li
- Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University Xuzhou 221116 China
| | - Yanming Ma
- State Key Laboratory of Superhard Materials & International Center for Computational Method and Software, College of Physics, Jilin University Changchun 130012 China
- International Center of Future Science, Jilin University Changchun 130012 China
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14
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Deblonde GJP, Zavarin M, Kersting AB. The coordination properties and ionic radius of actinium: A 120-year-old enigma. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214130] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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15
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Zhang X, Zhao Y, Yang G. Superconducting ternary hydrides under high pressure. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2021. [DOI: 10.1002/wcms.1582] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xiaohua Zhang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science Yanshan University Qinhuangdao China
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light‐Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun China
| | - Yaping Zhao
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science Yanshan University Qinhuangdao China
| | - Guochun Yang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science Yanshan University Qinhuangdao China
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light‐Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun China
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16
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Talantsev EF. Comparison of highly-compressed C2/ m-SnH 12superhydride with conventional superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:285601. [PMID: 33908372 DOI: 10.1088/1361-648x/abfc18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 04/27/2021] [Indexed: 06/12/2023]
Abstract
Satterthwaite and Toepke (1970Phys. Rev. Lett.25741) predicted high-temperature superconductivity in hydrogen-rich metallic alloys, based on an idea that these compounds should exhibit high Debye frequency of the proton lattice, which boosts the superconducting transition temperature,Tc. The idea has got full confirmation more than four decades later when Drozdovet al(2015Nature52573) experimentally discovered near-room-temperature superconductivity in highly-compressed sulphur superhydride, H3S. To date, more than a dozen of high-temperature hydrogen-rich superconducting phases in Ba-H, Pr-H, P-H, Pt-H, Ce-H, Th-H, S-H, Y-H, La-H, and (La, Y)-H systems have been synthesized and, recently, Honget al(2021arXiv:2101.02846) reported on the discovery ofC2/m-SnH12phase with superconducting transition temperature ofTc∼ 70 K. Here we analyse the magnetoresistance data,R(T,B), ofC2/m-SnH12phase and report that this superhydride exhibits the ground state superconducting gap of Δ(0) = 9.2 ± 0.5 meV, the ratio of 2Δ(0)/kBTc= 3.3 ± 0.2, and 0.010 <Tc/TF< 0.014 (whereTFis the Fermi temperature) and, thus,C2/m-SnH12falls into unconventional superconductors band in the Uemura plot.
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Affiliation(s)
- E F Talantsev
- M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18, S. Kovalevskoy St., Ekaterinburg, 620108, Russia
- NANOTECH Centre, Ural Federal University, 19 Mira St., Ekaterinburg, 620002, Russia
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17
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Yang C, Chen J, Wang R, Zhang M, Zhang C, Liu J. Density Prediction Models for Energetic Compounds Merely Using Molecular Topology. J Chem Inf Model 2021; 61:2582-2593. [PMID: 33844526 DOI: 10.1021/acs.jcim.0c01393] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Newly developed high-throughput methods for property predictions make the process of materials design faster and more efficient. Density is an important physical property for energetic compounds to assess detonation velocity and detonation pressure, but the time cost of recent density prediction models is still high owing to the time-consuming processes to calculate molecular descriptors. To improve the screening efficiency of potential energetic compounds, new methods for density prediction with more accuracy and less time cost are urgently needed, and a possible solution is to establish direct mappings between the molecular structure and density. We propose three machine learning (ML) models, support vector machine (SVM), random forest (RF), and Graph neural network (GNN), using molecular topology as the only known input. The widely applied quantitative structure-property relationship based on the density functional theory (DFT-QSPR) is adopted as the benchmark to evaluate the accuracies of the models. All these four models are trained and tested by using the same data set enclosing over 2000 reported nitro compounds searched out from the Cambridge Structural Database. The proportions of compounds with prediction error less than 5% are evaluated by using the independent test set, and the values for the models of SVM, RF, DFT-QSPR, and GNN are 48, 63, 85, and 88%, respectively. The results show that, for the models of SVM and RF, fingerprint bit vectors alone are not facilitated to obtain good QSPRs. Mapping between the molecular structure and density can be well established by using GNN and molecular topology, and its accuracy is slightly better than that of the time-consuming DFT-QSPR method. The GNN-based model has higher accuracy and lower computational resource cost than the widely accepted DFT-QSPR model, so it is more suitable for high-throughput screening of energetic compounds.
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Affiliation(s)
- Chunming Yang
- School of Computer Science and Technology, Southwest University of Science & Technology, Mianyang 621010, Sichuan, China
| | - Jie Chen
- School of Computer Science and Technology, Southwest University of Science & Technology, Mianyang 621010, Sichuan, China.,Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang 621999, Sichuan, China
| | - Runwen Wang
- School of Computer Science and Technology, Southwest University of Science & Technology, Mianyang 621010, Sichuan, China.,Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang 621999, Sichuan, China
| | - Miao Zhang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China
| | - Chaoyang Zhang
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang 621999, Sichuan, China
| | - Jian Liu
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang 621999, Sichuan, China
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18
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Troyan IA, Semenok DV, Kvashnin AG, Sadakov AV, Sobolevskiy OA, Pudalov VM, Ivanova AG, Prakapenka VB, Greenberg E, Gavriliuk AG, Lyubutin IS, Struzhkin VV, Bergara A, Errea I, Bianco R, Calandra M, Mauri F, Monacelli L, Akashi R, Oganov AR. Anomalous High-Temperature Superconductivity in YH 6. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2006832. [PMID: 33751670 DOI: 10.1002/adma.202006832] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/25/2020] [Indexed: 06/12/2023]
Abstract
Pressure-stabilized hydrides are a new rapidly growing class of high-temperature superconductors, which is believed to be described within the conventional phonon-mediated mechanism of coupling. Here, the synthesis of one of the best-known high-TC superconductors-yttrium hexahydride I m 3 ¯ m -YH6 is reported, which displays a superconducting transition at ≈224 K at 166 GPa. The extrapolated upper critical magnetic field Bc2 (0) of YH6 is surprisingly high: 116-158 T, which is 2-2.5 times larger than the calculated value. A pronounced shift of TC in yttrium deuteride YD6 with the isotope coefficient 0.4 supports the phonon-assisted superconductivity. Current-voltage measurements show that the critical current IC and its density JC may exceed 1.75 A and 3500 A mm-2 at 4 K, respectively, which is higher than that of the commercial superconductors, such as NbTi and YBCO. The results of superconducting density functional theory (SCDFT) and anharmonic calculations, together with anomalously high critical magnetic field, suggest notable departures of the superconducting properties from the conventional Migdal-Eliashberg and Bardeen-Cooper-Schrieffer theories, and presence of an additional mechanism of superconductivity.
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Affiliation(s)
- Ivan A Troyan
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
| | - Dmitrii V Semenok
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 121025, Russia
| | - Alexander G Kvashnin
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 121025, Russia
| | - Andrey V Sadakov
- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Oleg A Sobolevskiy
- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Vladimir M Pudalov
- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia
- National Research University, Higher School of Economics, Moscow, 101000, Russia
| | - Anna G Ivanova
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL, 60637, USA
| | - Eran Greenberg
- Center for Advanced Radiation Sources, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL, 60637, USA
| | - Alexander G Gavriliuk
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
- Institute for Nuclear Research, Russian Academy of Sciences, Fizicheskaya str. 27, Troitsk, Moscow, 108840, Russia
| | - Igor S Lyubutin
- Shubnikov Institute of Crystallography, Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, 59 Leninskii Prospect, Moscow, 119333, Russia
| | - Viktor V Struzhkin
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
| | - Aitor Bergara
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Basque Country, Donostia, 20018, Spain
- Departamento de Física de la Materia Condensada, University of the Basque Country (UPV/EHU), Basque Country, Bilbao, 48080, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal pasealekua 4, Basque Country, Donostia, 20018, Spain
| | - Ion Errea
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Basque Country, Donostia, 20018, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal pasealekua 4, Basque Country, Donostia, 20018, Spain
- Fisika Aplikatua 1 Saila, University of the Basque Country (UPV/EHU), Europa plaza 1, Donostia, 20018, Spain
| | - Raffaello Bianco
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Basque Country, Donostia, 20018, Spain
| | - Matteo Calandra
- Departimento di Fisica, Università di Trento, Via Sommarive 14, Povo, 38123, Italy
- Sorbonne Université, CNRS, Institut des Nanosciences de Paris, UMR7588, Paris, F-75252, France
- Graphene Labs, Fondazione Istituto Italiano di Tecnologia, Via Morego, Genova, I-16163, Italy
| | - Francesco Mauri
- Sorbonne Université, CNRS, Institut des Nanosciences de Paris, UMR7588, Paris, F-75252, France
- Graphene Labs, Fondazione Istituto Italiano di Tecnologia, Via Morego, Genova, I-16163, Italy
| | - Lorenzo Monacelli
- Graphene Labs, Fondazione Istituto Italiano di Tecnologia, Via Morego, Genova, I-16163, Italy
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, Roma, I-00185, Italy
| | - Ryosuke Akashi
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8654, Japan
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 121025, Russia
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, Roma, I-00185, Italy
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8654, Japan
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19
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Wang XH, Zheng FW, Gu ZW, Tan FL, Zhao JH, Liu CL, Sun CW, Liu J, Zhang P. Hydrogen Clathrate Structures in Uranium Hydrides at High Pressures. ACS OMEGA 2021; 6:3946-3950. [PMID: 33644531 PMCID: PMC7906488 DOI: 10.1021/acsomega.0c05794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 01/13/2021] [Indexed: 06/12/2023]
Abstract
Room-temperature superconductivity has always been an area of intensive research. Recent findings of clathrate metal hydrides structures have opened up the doors for achieving room-temperature superconductivity in these materials. Here, we report first-principles calculations for stable H-rich clathrate structures of uranium hydrides at high pressures. The clathrate uranium hydrides contain H cages with stoichiometries of H24, H29, and H32, in which H atoms are bonded covalently to other H atoms, and U atoms occupy the centers of the cages. Especially, a UH10 clathrate structure containing H32 cages is predicted to have an estimated T c higher than 77 K at high pressures.
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Affiliation(s)
- Xiao-hui Wang
- College
of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Fa-wei Zheng
- Institute
of Applied Physics and Computational Mathematics, Beijing 100088, China
| | - Zhuo-wei Gu
- Institute
of Fluid Physics, China Academy of Engineering
Physics, Mianyang 621900, China
| | - Fu-li Tan
- Institute
of Fluid Physics, China Academy of Engineering
Physics, Mianyang 621900, China
| | - Jian-heng Zhao
- Institute
of Fluid Physics, China Academy of Engineering
Physics, Mianyang 621900, China
| | - Cang-li Liu
- Institute
of Fluid Physics, China Academy of Engineering
Physics, Mianyang 621900, China
| | - Cheng-wei Sun
- Institute
of Fluid Physics, China Academy of Engineering
Physics, Mianyang 621900, China
| | - Jian Liu
- State
Key Laboratory of Heavy Oil, China University
of Petroleum-Beijing, Beijing 102249, China
| | - Ping Zhang
- Institute
of Applied Physics and Computational Mathematics, Beijing 100088, China
- HEDPS,
Center for Applied Physics and Technology, Peking University, Beijing 100871, China
- Beijing
Computational Science Research Center, Beijing 100193, China
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20
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Xie H, Yao Y, Feng X, Duan D, Song H, Zhang Z, Jiang S, Redfern SAT, Kresin VZ, Pickard CJ, Cui T. Hydrogen Pentagraphenelike Structure Stabilized by Hafnium: A High-Temperature Conventional Superconductor. PHYSICAL REVIEW LETTERS 2020; 125:217001. [PMID: 33275012 DOI: 10.1103/physrevlett.125.217001] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 07/07/2020] [Accepted: 09/21/2020] [Indexed: 05/25/2023]
Abstract
The recent discovery of H_{3}S and LaH_{10} superconductors with record high superconducting transition temperatures T_{c} at high pressure has fueled the search for room-temperature superconductivity in the compressed superhydrides. Here we introduce a new class of high T_{c} hydrides with a novel structure and unusual properties. We predict the existence of an unprecedented hexagonal HfH_{10}, with remarkably high value of T_{c} (around 213-234 K) at 250 GPa. As concerns the novel structure, the H ions in HfH_{10} are arranged in clusters to form a planar "pentagraphenelike" sublattice. The layered arrangement of these planar units is entirely different from the covalent sixfold cubic structure in H_{3}S and clathratelike structure in LaH_{10}. The Hf atom acts as a precompressor and electron donor to the hydrogen sublattice. This pentagraphenelike H_{10} structure is also found in ZrH_{10}, ScH_{10}, and LuH_{10} at high pressure, each material showing a high T_{c} ranging from 134 to 220 K. Our study of dense superhydrides with pentagraphenelike layered structures opens the door to the exploration of a new class of high T_{c} superconductors.
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Affiliation(s)
- Hui Xie
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Yansun Yao
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Xiaolei Feng
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
- Department of Earth Science, University of Cambridge, Downing Site, Cambridge CB2 3EQ, United Kingdom
| | - Defang Duan
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - Hao Song
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Zihan Zhang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Shuqing Jiang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Synergetic Extreme Condition User Facility, College of Physics, Jilin University, Changchun, Jilin 130012, China
| | - Simon A T Redfern
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
- Asian School of the Environment, Nanyang Technological University, Singapore 639798
| | - Vladimir Z Kresin
- Lawrence Berkeley Laboratory, University of California at Berkeley, Berkeley, California 94720, USA
| | - Chris J Pickard
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
- Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
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21
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Chen D, Gao W, Jiang Q. Distinguishing the Structures of High-Pressure Hydrides with Nuclear Magnetic Resonance Spectroscopy. J Phys Chem Lett 2020; 11:9439-9445. [PMID: 33108187 DOI: 10.1021/acs.jpclett.0c02657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The structural characterization of high-pressure hydrides has encountered many difficulties mainly due to the weak X-ray scattering of hydrogen. Herein, we investigate the prospect of detecting the H3S and LaH10 structures with nuclear magnetic resonance (NMR) spectroscopy. Our calculations demonstrate that the different candidate structures of H3S (or LaH10) exhibit significant differences in the electric field gradient (EFG) tensor of the 33S (or 139La) sites, indicating that the NMR spectroscopy can well capture the structural differences, even the small changes in the atomic position, and hence can be used to effectively probe the structures and the phase transitions of H3S and LaH10. Our results clarify the relationship between the structures and the EFG tensor parameters and provide a potential means to detect the structures of high-pressure hydrides.
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Affiliation(s)
- Da Chen
- Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China
| | - Wang Gao
- Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China
| | - Qing Jiang
- Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China
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22
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Chen X, Wang D, Liu X, Li L, Sanyal B. Two-Dimensional Square-A 2B (A = Cu, Ag, Au, and B = S, Se): Auxetic Semiconductors with High Carrier Mobilities and Unusually Low Lattice Thermal Conductivities. J Phys Chem Lett 2020; 11:2925-2933. [PMID: 32223172 DOI: 10.1021/acs.jpclett.0c00613] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Using evolutionary structure search combined with ab initio theory, we investigate the electronic, thermal, and mechanical properties of two-dimensional (2D) A2B (A = Cu, Ag, Au, and B = S, Se) auxetic semiconductors. Two types of structures are found to have low energy, namely, s(I/II)-A2B, which have direct bandgaps in the range 1.09-2.60 eV and high electron mobilities. Among these semiconductors, Cu2B and Ag2B have light holes with 2 orders of magnitude larger mobility than the heavy holes, up to 9.51 × 104 cm2 V-1 s-1, giving the possibility of achieving highly anisotropic hole transport with the application of a uniaxial strain. Due to the ionic bonding nature, s-A2B structures have unusually low lattice thermal conductivities down to 1.5 W m-1 K-1 at 300 K, which are quite promising for new generation thermoelectric devices. Besides, s-A2B structures show extraordinary flexibility with ultralow Young's moduli (down to 20 N/m), which are lower than most previously reported 2D materials. Moreover, under strain along the diagonal direction, five of the structures have in-plane negative Poisson's ratios.
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Affiliation(s)
- Xin Chen
- Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
| | - Duo Wang
- Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
| | - Xiaobiao Liu
- School of Sciences, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Linyang Li
- School of Science, Hebei University of Technology, Tianjin 300401, People's Republic of China
| | - Biplab Sanyal
- Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
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23
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Xie H, Zhang W, Duan D, Huang X, Huang Y, Song H, Feng X, Yao Y, Pickard CJ, Cui T. Superconducting Zirconium Polyhydrides at Moderate Pressures. J Phys Chem Lett 2020; 11:646-651. [PMID: 31903761 DOI: 10.1021/acs.jpclett.9b03632] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Highly compressed hydrides have been at the forefront of the search for high-Tc superconductivity. The recent discovery of record-high Tc's in H3S and LaH10±x under high pressure fuels the enthusiasm for finding good superconductors in similar hydride groups. Guided by first-principles structure prediction, we successfully synthesized ZrH3 and Zr4H15 at modest pressures (30-50 GPa) in diamond anvil cells by two different reaction routes: ZrH2 + H2 at room temperature and Zr + H2 at ∼1500 K by laser heating. From the synchrotron X-ray diffraction patterns, ZrH3 is found to have a Pm3̅n structure corresponding to the familiar A15 structure, and Zr4H15 has an I4̅3d structure isostructural to Th4H15. Electrical resistance measurement and the dependence of Tc on the applied magnetic field of the sample showed the emergence of two superconducting transitions at 6.4 and 4.0 K at 40 GPa, which correspond to the two Tc's for ZrH3 and Zr4H15.
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Affiliation(s)
- Hui Xie
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
| | - Wenting Zhang
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
| | - Defang Duan
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
- Department of Materials Science and Metallurgy , University of Cambridge , 27 Charles Babbage Road , Cambridge CB3 0FS , United Kingdom
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
| | - Yanping Huang
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
| | - Hao Song
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
| | - Xiaolei Feng
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , 10 Xibeiwang East Road , Beijing , 100094 , China
- Department of Earth Science , University of Cambridge , Downing Street , Cambridge CB2 3EQ , United Kingdom
| | - Yansun Yao
- Department of Physics and Engineering Physics , University of Saskatchewan , Saskatoon , Saskatchewan S7N 5E2 , Canada
| | - Chris J Pickard
- Department of Materials Science and Metallurgy , University of Cambridge , 27 Charles Babbage Road , Cambridge CB3 0FS , United Kingdom
- Advanced Institute for Materials Research , Tohoku University , 2-1-1 Katahira , Aoba, Sendai 980-8577 , Japan
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
- School of Physical Science and Technology , Ningbo University , No. 818 Fenghua Road , Jiangbei District, Ningbo , 315211 , China
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24
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Zhou D, Semenok DV, Duan D, Xie H, Chen W, Huang X, Li X, Liu B, Oganov AR, Cui T. Superconducting praseodymium superhydrides. SCIENCE ADVANCES 2020; 6:eaax6849. [PMID: 32158937 PMCID: PMC7048426 DOI: 10.1126/sciadv.aax6849] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Accepted: 11/25/2019] [Indexed: 05/20/2023]
Abstract
Superhydrides have complex hydrogenic sublattices and are important prototypes for studying metallic hydrogen and high-temperature superconductors. Previous results for LaH10 suggest that the Pr-H system may be especially worth studying because of the magnetism and valence-band f-electrons in the element Pr. Here, we successfully synthesized praseodymium superhydrides (PrH9) in laser-heated diamond anvil cells. Synchrotron x-ray diffraction analysis demonstrated the presence of previously predicted F4 ¯ 3m-PrH9 and unexpected P63/mmc-PrH9 phases. Experimental studies of electrical resistance in the PrH9 sample showed the emergence of a possible superconducting transition (T c) below 9 K and T c dependent on the applied magnetic field. Theoretical calculations indicate that magnetic order and likely superconductivity coexist in a narrow range of pressures in the PrH9 sample, which may contribute to its low superconducting temperature. Our results highlight the intimate connections between hydrogenic sublattices, density of states, magnetism, and superconductivity in Pr-based superhydrides.
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Affiliation(s)
- Di Zhou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Dmitrii V. Semenok
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center 143026, 3 Nobel Street, Moscow, Russia
| | - Defang Duan
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Hui Xie
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Wuhao Chen
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Xin Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Artem R. Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center 143026, 3 Nobel Street, Moscow, Russia
- International Center for Materials Discovery, Northwestern Polytechnical University, Xi’an 710072, China
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
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25
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Zhou D, Semenok DV, Xie H, Huang X, Duan D, Aperis A, Oppeneer PM, Galasso M, Kartsev AI, Kvashnin AG, Oganov AR, Cui T. High-Pressure Synthesis of Magnetic Neodymium Polyhydrides. J Am Chem Soc 2020; 142:2803-2811. [DOI: 10.1021/jacs.9b10439] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Di Zhou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Dmitrii V. Semenok
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
| | - Hui Xie
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Defang Duan
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Alex Aperis
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, Uppsala SE-75120, Sweden
| | - Peter M. Oppeneer
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, Uppsala SE-75120, Sweden
| | - Michele Galasso
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
| | - Alexey I. Kartsev
- Computing Center of Far Eastern Branch of the Russian Academy of Sciences (CC FEB RAS), Khabarovsk 680000, Russian Federation
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, Northern Ireland BT7 1NN, United Kingdom
| | - Alexander G. Kvashnin
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
| | - Artem R. Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
- International Center for Materials Discovery, Northwestern Polytechnical University, Xi’an 710072, China
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
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26
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Wang X, Liu X. High pressure: a feasible tool for the synthesis of unprecedented inorganic compounds. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00477d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
After a simple classification of inorganic materials synthesized at high-temperature and high-pressure, this tutorial reviews the important research results in the field of high-temperature and high-pressure inorganic synthesis in the past 5 years.
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Affiliation(s)
- Xuerong Wang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Xiaoyang Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
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27
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Wang L, Zhang M, Chen J, Su L, Zhao S, Zhang C, Liu J, Chen C. Corrections of Molecular Morphology and Hydrogen Bond for Improved Crystal Density Prediction. Molecules 2019; 25:E161. [PMID: 31906099 PMCID: PMC6983118 DOI: 10.3390/molecules25010161] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 12/22/2019] [Accepted: 12/25/2019] [Indexed: 11/18/2022] Open
Abstract
Density prediction is of great significance for molecular design of energetic materials, since detonation velocity linearly with density and detonation pressure increases with the density squared. However, the accuracy and generalization of former reported prediction models need further improvement, because most of them are derived from small data sets and few molecular descriptors. As shown in this paper, for molecules presenting brick-like shape or containing more hydrogen-bond donors the predicted densities have large negative deviations from experimental values. Thus, a molecular morphology descriptor η and a hydrogen-bond descriptor Hb are introduced as correction items to build 3 new QSPR models. Besides, 3694 nitro compounds are adopted as data set by this work. The accuracies are obviously improved, and the generalizations are verified by an independent test set. At the level of B3PW91/6-31G(d,p), the effective ratios (ERs) of the 3 Equations, for Δρ < 5%, are 92.7%, 91.8%, and 93.3%; for Δρ < 2%, the values are 53.5%, 51.3%, and 54.7%. At the level of B3LYP/6-31G**, for Δρ < 5%, the values are 92.3%, 91.4% and 92.9%; for Δρ < 2%, the values are 53.7%, 51.4% and 53.2%.
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Affiliation(s)
- Linyuan Wang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; (L.W.); (M.Z.); (C.C.)
| | - Miao Zhang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; (L.W.); (M.Z.); (C.C.)
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang 621999, China;
| | - Jie Chen
- College of Computer Science and Technology, Southwest University of Science & Technology, Mianyang 621010, China; (J.C.); (L.S.)
| | - Liang Su
- College of Computer Science and Technology, Southwest University of Science & Technology, Mianyang 621010, China; (J.C.); (L.S.)
| | - Shicao Zhao
- Institute of Computer Applications, China Academy of Engineering Physics (CAEP), P.O. Box 919-1201, Mianyang 621999, China;
| | - Chaoyang Zhang
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang 621999, China;
| | - Jian Liu
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang 621999, China;
| | - Chunyan Chen
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; (L.W.); (M.Z.); (C.C.)
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28
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Salke NP, Davari Esfahani MM, Zhang Y, Kruglov IA, Zhou J, Wang Y, Greenberg E, Prakapenka VB, Liu J, Oganov AR, Lin JF. Synthesis of clathrate cerium superhydride CeH 9 at 80-100 GPa with atomic hydrogen sublattice. Nat Commun 2019; 10:4453. [PMID: 31575861 PMCID: PMC6773858 DOI: 10.1038/s41467-019-12326-y] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 08/28/2019] [Indexed: 11/10/2022] Open
Abstract
Hydrogen-rich superhydrides are believed to be very promising high-Tc superconductors. Recent experiments discovered superhydrides at very high pressures, e.g. FeH5 at 130 GPa and LaH10 at 170 GPa. With the motivation of discovering new hydrogen-rich high-Tc superconductors at lowest possible pressure, here we report the prediction and experimental synthesis of cerium superhydride CeH9 at 80–100 GPa in the laser-heated diamond anvil cell coupled with synchrotron X-ray diffraction. Ab initio calculations were carried out to evaluate the detailed chemistry of the Ce-H system and to understand the structure, stability and superconductivity of CeH9. CeH9 crystallizes in a P63/mmc clathrate structure with a very dense 3-dimensional atomic hydrogen sublattice at 100 GPa. These findings shed a significant light on the search for superhydrides in close similarity with atomic hydrogen within a feasible pressure range. Discovery of superhydride CeH9 provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides. Hydrogen-rich superhydrides are promising high-temperature superconductors which have been observed only at pressures above 170 GPa. Here the authors show that CeH9 can be synthesized at 80-100 GPa with laser heating, and is characterized by a clathrate structure with a dense 3-dimensional atomic hydrogen sublattice.
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Affiliation(s)
- Nilesh P Salke
- Center for High Pressure Science & Technology Advanced Research (HPSTAR), 100094, Beijing, China
| | - M Mahdi Davari Esfahani
- Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, State University of New York, Stony Brook, New York, NY, 11794-2100, USA
| | - Youjun Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, China
| | - Ivan A Kruglov
- Department of Problems of Physics and Energetics, Moscow Institute of Physics and Technology, 9 Institutskiy Lane, Dolgoprudny City, Moscow Region, 141700, Russia.,Dukhov Research Institute of Automatics (VNIIA), Moscow, 127055, Russia
| | - Jianshi Zhou
- Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Yaguo Wang
- Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Eran Greenberg
- Center for Advanced Radiation Sources, University of Chicago, Chicago, 60637, IL, USA
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, 60637, IL, USA
| | - Jin Liu
- Center for High Pressure Science & Technology Advanced Research (HPSTAR), 100094, Beijing, China
| | - Artem R Oganov
- Department of Problems of Physics and Energetics, Moscow Institute of Physics and Technology, 9 Institutskiy Lane, Dolgoprudny City, Moscow Region, 141700, Russia. .,Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel Street, Moscow, 143026, Russia. .,International Center for Materials Design, Northwestern Polytechnical University, 710072, Xi'an, China.
| | - Jung-Fu Lin
- Department of Geological Sciences, The University of Texas at Austin, Austin, TX, 78712, USA.
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29
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Xiao X, Duan D, Xie H, Shao Z, Li D, Tian F, Song H, Yu H, Bao K, Cui T. Structure and superconductivity of protactinium hydrides under high pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:315403. [PMID: 31026850 DOI: 10.1088/1361-648x/ab1d03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We systematically study the stability, crystal structure, electronic property, and superconductivity of protactinium hydride (PaH n ) (n = 1-9) at a pressure range of 1 atm to 300 GPa by using the first principle of density functional theory. PaH n compounds are very rich, featuring six stoichiometries, such as PaH, PaH3, PaH4, PaH5, PaH8 and PaH9. PaH8 possesses the highly symmetrical crystal structure Fm-3m with cubic H8 units, which is predicted to be thermodynamically stable above 32 GPa. This phase maintains a dynamically stable decompression at 10 GPa. Electron-phonon coupling (EPC) calculations show that Fm-3m-PaH8 exhibits high superconducting critical transition temperature (T c) value of 79 K at 10 GPa due to a strong EPC and large logarithmic average frequency. The T c values of Fm-3m-PaH8 decrease with increasing pressure. Interestingly, superconducting PaH8 appears at low pressure, prompting experimental research.
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Affiliation(s)
- Xuehui Xiao
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
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30
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Yu H, Lin X, Li K, Chen Y. Unveiling a Novel, Cation-Rich Compound in a High-Pressure Pb-Te Binary System. ACS CENTRAL SCIENCE 2019; 5:683-687. [PMID: 31041388 PMCID: PMC6487446 DOI: 10.1021/acscentsci.9b00083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Indexed: 06/09/2023]
Abstract
Because of the common oxidation states of group IV elements (+2 or +4) and group VI elements (-2), 1:1 and 1:2 are two typical stoichiometries found in the IV-VI compounds. Particularly, in the Pb-Te binary system, the 1:1 stoichiometric PbTe is believed to be the only stable compound. Herein, using evolutionary algorithms, density functional theory, a laser-heated diamond anvil cell, and synchrotron X-ray diffraction experiments, we discovered a novel Pb-Te compound with an unexpected stoichiometry of 3:2 above 20 GPa. This tetragonal Pb3Te2 is the one of the very few cation-rich compounds that has ever been discovered in the entire IV-VI binary system. Further analyses based on electron density distribution, electron localization function, and Bader charge have shown that this newly discovered compound has a mixed character of chemical bonding with a decreased ionicity. By further calculating the electron-phonon interaction, Pb3Te2 is predicted to exhibit a superconducting transition at low temperatures. The discovery of Pb3Te2 paves the way for further explorations of other novel cation-rich IV-VI group compounds.
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Affiliation(s)
- Hulei Yu
- Department
of Mechanical Engineering, The University
of Hong Kong, Pokfulam Road, Hong Kong SAR, China
- HKU
Zhejiang Institute of Research and Innovation, 1623 Dayuan Road, Lin An 311305, China
| | - Xiaohuan Lin
- Center
for High Pressure Science and Technology Advanced Research, 10 Dongbeiwang West Road, Haidian, Beijing, China
| | - Kuo Li
- Center
for High Pressure Science and Technology Advanced Research, 10 Dongbeiwang West Road, Haidian, Beijing, China
| | - Yue Chen
- Department
of Mechanical Engineering, The University
of Hong Kong, Pokfulam Road, Hong Kong SAR, China
- HKU
Zhejiang Institute of Research and Innovation, 1623 Dayuan Road, Lin An 311305, China
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31
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Xia Y, Yang B, Jin F, Ma Y, Liu X, Zhao M. Hydrogen Confined in a Single Wall Carbon Nanotube Becomes a Metallic and Superconductive Nanowire under High Pressure. NANO LETTERS 2019; 19:2537-2542. [PMID: 30884943 DOI: 10.1021/acs.nanolett.9b00258] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metallic hydrogen is a long-desired material. However, the pressure needed to metallize hydrogen is difficult to access experimentally. We demonstrated that the high-density of hydrogen confined in a (8,0) single-wall carbon nanotube (SWNT) can be metallized at a relative low pressure of 163.5 GPa, due to the " physical compression" effect of SWNT. Through mimicking experimental measurements of the specific heat of confined hydrogen nanowire, we showed that the electronic specific heat of the hydrogen has a clear jump around 225 K, verifying a superconducting transition at this critical temperature. The superconducting hydrogen can be very well explained by the Eliashberg superconductivity theory for an electron-phonon strong-coupling system. Our simulation results open an avenue for the study of nanohydrogen materials at high pressure.
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Affiliation(s)
- Yueyuan Xia
- School of Physics & State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Bo Yang
- School of Physics & State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Fan Jin
- School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China
| | - Yuchen Ma
- School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China
| | - Xiangdong Liu
- School of Physics & State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Mingwen Zhao
- School of Physics & State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
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32
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Zurek E, Bi T. High-temperature superconductivity in alkaline and rare earth polyhydrides at high pressure: A theoretical perspective. J Chem Phys 2019; 150:050901. [DOI: 10.1063/1.5079225] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- Eva Zurek
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA
| | - Tiange Bi
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA
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33
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Lepeshkin SV, Baturin VS, Uspenskii YA, Oganov AR. Method for Simultaneous Prediction of Atomic Structure and Stability of Nanoclusters in a Wide Area of Compositions. J Phys Chem Lett 2019; 10:102-106. [PMID: 30560675 DOI: 10.1021/acs.jpclett.8b03510] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We present a universal method for the large-scale prediction of the atomic structure of clusters. Our algorithm performs the joint evolutionary search for all clusters in a given area of the compositional space and takes advantage of structural similarities frequently observed in clusters of close compositions. The resulting speedup is up to 50 times compared to current methods. This enables first-principles studies of multicomponent clusters with full coverage of a wide range of compositions. As an example, we report an unprecedented first-principles global optimization of 315 Si nO m clusters with n ≤ 15 and m ≤ 20. The obtained map of Si-O cluster stability shows the existence of both expected (SiO2) n and unexpected (e.g., Si4O18) stable (magic) clusters, which can be important for a variety of applications.
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Affiliation(s)
- S V Lepeshkin
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center , Nobel St. 3 , Moscow 143026 , Russia
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences , Leninskii prosp. 53 , 119991 Moscow , Russia
| | - V S Baturin
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center , Nobel St. 3 , Moscow 143026 , Russia
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences , Leninskii prosp. 53 , 119991 Moscow , Russia
| | - Yu A Uspenskii
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences , Leninskii prosp. 53 , 119991 Moscow , Russia
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center , Nobel St. 3 , Moscow 143026 , Russia
- Moscow Institute of Physics and Technology , Dolgoprudny , Moscow Region 141700 , Russia
- Northwestern Polytechnical University , Xi'an , Shaanxi 710072 , People's Republic of China
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34
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Joshi M, Ghanty TK. Predicted M(H 2) 12n+ (M = Ac, Th, Pa, U, La and n = 3, 4) complexes with twenty-four hydrogen atoms bound to the metal ion. Chem Commun (Camb) 2019; 55:7788-7791. [PMID: 31210209 DOI: 10.1039/c9cc02458a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we have shown that La(iii), Ac(iii), Th(iii), Th(iv), Pa(iv) and U(iv) can directly bind with a maximum of 24 hydrogen atoms in M(H2)12 in the first sphere of coordination, which would be a new record in any metal-hydrogen complex investigated at the molecular level, where all the hydrogen atoms are directly connected to the central metal ion through M-η2(H2) bonds. Moreover, Ac(H2)n3+ (n = 9-12) systems satisfy the 18-electron rule.
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Affiliation(s)
- Meenakshi Joshi
- Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Mumbai-400085, India.
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35
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Kvashnin AG, Semenok DV, Kruglov IA, Wrona IA, Oganov AR. High-Temperature Superconductivity in a Th-H System under Pressure Conditions. ACS APPLIED MATERIALS & INTERFACES 2018; 10:43809-43816. [PMID: 30512924 DOI: 10.1021/acsami.8b17100] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
New stable phase thorium decahydride Fm3̅ m-ThH10, a high-temperature superconductor with TC up to 241 K (-32 °C), critical field HC up to 71 T, and superconducting gap Δ0 of 52 meV at 80-100 GPa, is predicted by evolutionary algorithm USPEX. Another phase, P21/ c-ThH7, is found to be a superconductor with TC of 62 K. Analysis of the superconducting state was performed within Eliashberg formalism, and HC( T), Δ( T), and TC( P) functions with a jump in the specific heat at critical temperature were calculated. Several other new thorium hydrides were predicted to be stable under pressure, including ThH3, Th3H10, ThH4, and ThH6. Thorium (which has s2 d2 electronic configuration) forms high- TC polyhydrides similar to those formed by s2 d1 metals (Y-La-Ac). Thorium belongs to the Mg-Ca-Sc-Y-La-Ac family of elements forming high- TC superconducting hydrides.
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Affiliation(s)
- Alexander G Kvashnin
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center , 3 Nobel Street , Moscow 143026 , Russia
- Moscow Institute of Physics and Technology , 9 Institutskiy Lane , Dolgoprudny 141700 , Russia
| | - Dmitrii V Semenok
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center , 3 Nobel Street , Moscow 143026 , Russia
- Moscow Institute of Physics and Technology , 9 Institutskiy Lane , Dolgoprudny 141700 , Russia
| | - Ivan A Kruglov
- Moscow Institute of Physics and Technology , 9 Institutskiy Lane , Dolgoprudny 141700 , Russia
- Dukhov Research Institute of Automatics (VNIIA) , Moscow 127055 , Russia
| | - Izabela A Wrona
- Institute of Physics , Jan Dlugosz University in Czestochowa , Armii Krajowej 13/15 Avenue , 42-200 Czestochowa , Poland
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center , 3 Nobel Street , Moscow 143026 , Russia
- Dukhov Research Institute of Automatics (VNIIA) , Moscow 127055 , Russia
- International Center for Materials Discovery , Northwestern Polytechnical University , Xi'an 710072 , China
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36
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Kruglov IA, Kvashnin AG, Goncharov AF, Oganov AR, Lobanov SS, Holtgrewe N, Jiang S, Prakapenka VB, Greenberg E, Yanilkin AV. Uranium polyhydrides at moderate pressures: Prediction, synthesis, and expected superconductivity. SCIENCE ADVANCES 2018; 4:eaat9776. [PMID: 30333994 PMCID: PMC6184697 DOI: 10.1126/sciadv.aat9776] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 09/04/2018] [Indexed: 05/31/2023]
Abstract
Hydrogen-rich hydrides attract great attention due to recent theoretical (1) and then experimental discovery of record high-temperature superconductivity in H3S [T c = 203 K at 155 GPa (2)]. Here we search for stable uranium hydrides at pressures up to 500 GPa using ab initio evolutionary crystal structure prediction. Chemistry of the U-H system turned out to be extremely rich, with 14 new compounds, including hydrogen-rich UH5, UH6, U2H13, UH7, UH8, U2H17, and UH9. Their crystal structures are based on either common face-centered cubic or hexagonal close-packed uranium sublattice and unusual H8 cubic clusters. Our high-pressure experiments at 1 to 103 GPa confirm the predicted UH7, UH8, and three different phases of UH5, raising confidence about predictions of the other phases. Many of the newly predicted phases are expected to be high-temperature superconductors. The highest-T c superconductor is UH7, predicted to be thermodynamically stable at pressures above 22 GPa (with T c = 44 to 54 K), and this phase remains dynamically stable upon decompression to zero pressure (where it has T c = 57 to 66 K).
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Affiliation(s)
- Ivan A. Kruglov
- Dukhov Research Institute of Automatics (VNIIA), Moscow 127055, Russian Federation
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russian Federation
| | - Alexander G. Kvashnin
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russian Federation
- Skolkovo Institute of Science and Technology, 3 Nobel St., Moscow 143026, Russian Federation
| | - Alexander F. Goncharov
- Key Laboratory of Materials Physics, Institute of Solid State Physics CAS, Hefei 230031, China
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
| | - Artem R. Oganov
- Dukhov Research Institute of Automatics (VNIIA), Moscow 127055, Russian Federation
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russian Federation
- Skolkovo Institute of Science and Technology, 3 Nobel St., Moscow 143026, Russian Federation
| | - Sergey S. Lobanov
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
- GFZ German Research Center for Geosciences, Section 4.3, Telegrafenberg, 14473 Potsdam, Germany
| | - Nicholas Holtgrewe
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
- Center for Advanced Radiations Sources, University of Chicago, Chicago, IL 60637, USA
| | - Shuqing Jiang
- Key Laboratory of Materials Physics, Institute of Solid State Physics CAS, Hefei 230031, China
| | - Vitali B. Prakapenka
- Center for Advanced Radiations Sources, University of Chicago, Chicago, IL 60637, USA
| | - Eran Greenberg
- Center for Advanced Radiations Sources, University of Chicago, Chicago, IL 60637, USA
| | - Alexey V. Yanilkin
- Dukhov Research Institute of Automatics (VNIIA), Moscow 127055, Russian Federation
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russian Federation
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