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Zhang P, Ding Y, Cui W, Hao J, Shi J, Li Y. Unveiling unconventional CH4-Xe compounds and their thermodynamic properties at extreme conditions. J Chem Phys 2024; 161:014501. [PMID: 38949593 DOI: 10.1063/5.0218769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 06/07/2024] [Indexed: 07/02/2024] Open
Abstract
Inert gases (e.g., He and Xe) can exhibit chemical activity at high pressure, reacting with other substances to form compounds of unexpected chemical stoichiometry. This work combines first-principles calculations and crystal structure predictions to propose four unexpected stable compounds of CH4Xe3, (CH4)2Xe, (CH4)3Xe, and (CH4)3Xe2 at pressure ranges from 2 to 100 GPa. All structures are composed of isolated Xe atoms and CH4 molecules except for (CH4)3Xe2, which comprises a polymerization product, C3H8, and hydrogen molecules. Ab initio molecular dynamics simulations indicate that pressure plays a very important role in the different temperature driving state transitions of CH4-Xe compounds. At lower pressures, the compounds follow the state transition of solid-plastic-fluid phases with increasing temperature, while at higher pressures, the stronger Xe-C interaction induces the emergence of a superionic state for CH4Xe3 and (CH4)3Xe2 as temperature increases. These results not only expand the family of CH4-Xe compounds, they also contribute to models of the structures and evolution of planetary interiors.
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Affiliation(s)
- Pan Zhang
- Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
- School of Sciences, Xinjiang Institute of Technology, Akesu 843100, China
| | - Yuelong Ding
- Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Wenwen Cui
- Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Jian Hao
- Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Jingming Shi
- 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
- Shandong Key Laboratory of Optical Communication Science and Technology, School of Physical Science and Information Technology of Liaocheng University, Liaocheng 252059, China
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2
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Kuntar SP, Ghosh A, Ghanty TK. Theoretical prediction of donor-acceptor type novel complexes with strong noble gas-boron covalent bond. Phys Chem Chem Phys 2024; 26:4975-4988. [PMID: 38258349 DOI: 10.1039/d3cp02667a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
The experimental identification of NgBeO molecules, followed by the recent theoretical exploration of super-strong NgBO+ (Ng = He-Rn) ions motivated us to investigate the stability of iso-electronic NgBNH+ (Ng = He-Rn) ions using various ab initio-based quantum chemical methods. The hydrogen-like chemical behavior of gold in small clusters and molecules also inspired us to study the nature of the bonding interactions in NgBNAu+ ions compared to that in NgBNH+ ions. The calculated Ng-B bond lengths in the predicted ions have been found to be much lower than the corresponding covalent limits, indicating a covalent Ng-B interaction in both the NgBNH+ and NgBNAu+ ions. In addition, the Ng-B bond dissociation energies are found to be in the range of 136.7-422.8 kJ mol-1 for NgBNH+ and 77.4-319.1 kJ mol-1 for NgBNAu+, implying the stable nature of the predicted ions. Interestingly, the Ng-B bond length (except for Ne) is the lowest reported to date together with the highest He-B and Ne-B binding energies considering all the neutral and cationic complexes containing Ng-B bonding motifs. Moreover, the natural bonding orbital (NBO) and electron density-based atoms-in-molecule (AIM) analysis reveal the covalent nature of the Ng-B bond in the predicted ions. Furthermore, the energy decomposition analysis together with the natural bond orbital in the chemical valence (EDA-NOCV) studies indicate that the orbital interaction energy is the main contributor to the total attraction energy in the Ng-B bonds. All the calculated results indicate the hydrogen-like chemical behavior of gold in the predicted NgBNM+ ions, showing further evidence of the concept of "gold-hydrogen analogy". Also, for comparison, the corresponding Cu and Ag analogs are investigated. All the computed results together with the experimental identification of the NgMX (Ng = Ar-Xe; M = Cu, Ag, Au; X = F, Cl), ArOH+, and NgBeO (Ng = Ar-Xe) systems clearly indicate that it may be possible to prepare and characterize the predicted NgBNM+ ions experimentally using suitable technique(s).
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Affiliation(s)
- Subrahmanya Prasad Kuntar
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400 094, India
- Bio-Science Group, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - Ayan Ghosh
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400 094, India
- Laser and Plasma Technology Division, Beam Technology Development Group, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Tapan K Ghanty
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400 094, India
- Bio-Science Group, Bhabha Atomic Research Centre, Mumbai 400 085, India.
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3
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Gao X, Wei S, Guo Y, Yin G, Meng Y, Ju X, Chang Q, Sun Y. A newly predicted stable calcium argon compound by ab initiocalculations under high pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 36:095402. [PMID: 37983903 DOI: 10.1088/1361-648x/ad0e2e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 11/20/2023] [Indexed: 11/22/2023]
Abstract
High pressure can change the valence electron arrangement of the elements, and it can be as a new method for the emergence of unexpected new compounds. In this paper, the Ca-Ar compounds at 0-200 GPa are systematically investigated by using CALYPSO structure prediction methods combined with first principles calculations. The study of the Ca-Ar system can provide theoretical guidance for the exploration of new structures of inert elemental Ar compounds under high pressure. A stable structure:P63/mmc-CaAr and six metastable structures:Rm-CaAr2,P4/mmm-CaAr2,Pm1-CaAr3,P4/mmm-CaAr3,P21/m-CaAr4andPm1-CaAr5were obtained. Our calculations show that the only stable phaseP63/mmc-CaAr can be synthesized at high pressure of 90 GPa. All the structures are ionic compounds of metallic nature, and surprisingly all Ar atoms attract electrons and act as an oxidant under high pressure conditions. The calculation results ofab initiomolecular dynamics show thatP63/mmc-CaAr compound maintains significant thermodynamic stability at high temperatures up to 1000 K. The high-pressure structures and electronic behaviors of the Ca-Ar system are expected to expand the understanding of the high-pressure chemical reactivity of compounds containing inert elements, and provide important theoretical support for the search of novel anomalous alkaline-earth metal inert element compounds.
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Affiliation(s)
- Xinlei Gao
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
| | - Shuli Wei
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
| | - Yanhui Guo
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
| | - Guowei Yin
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
| | - Yue Meng
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
| | - Xiaoshi Ju
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
| | - Qiang Chang
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
| | - Yuping Sun
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 250049, People's Republic of China
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4
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Tian Y, Tse JS, Liu G, Liu H. Predicted crystal structures of xenon and alkali metals under high pressures. Phys Chem Chem Phys 2022; 24:18119-18123. [PMID: 35881443 DOI: 10.1039/d2cp02657k] [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
The pressure-induced reaction between xenon (Xe) and other non-inert gas elements and the resultant crystal structures have attracted great interest. In this work, we carried out extensive simulations on the crystal structures of Xe-alkali metal (Xe-AM) systems under high pressures. Among all predicted compounds, KXe and RbXe are found to become stable at a pressure of ∼16 GPa by adopting a cubic symmetry of space group Pm3̄m. The stabilization of KXe and RbXe requires slightly lower pressure compared with that of previously reported CsXe (25 GPa), interestingly, which is in contrast to the electronegativity order of the AMs and unexpected. Our simulations also indicate that all predicted Xe compounds contain negatively charged Xe. Moreover, our in-depth analysis indicates that the occupation of AM d-orbitals plays a critical role in stabilizing these Xe-bearing compounds. These results shed light on the understanding of the reaction between Xe and AMs and the formation mechanism of the resultant crystal structures.
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Affiliation(s)
- Yifan Tian
- State Key Laboratory of Superhard Materials and International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China.
| | - John S Tse
- State Key Laboratory of Superhard Materials and International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China. .,Physics and Engineering Physics Department, University of Saskatchewan, S7N 5E2, Canada
| | - Guangtao Liu
- State Key Laboratory of Superhard Materials and International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China.
| | - Hanyu Liu
- State Key Laboratory of Superhard Materials and International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China.
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5
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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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6
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Peng F, Song X, Liu C, Li Q, Miao M, Chen C, Ma Y. Xenon iron oxides predicted as potential Xe hosts in Earth's lower mantle. Nat Commun 2020; 11:5227. [PMID: 33067445 PMCID: PMC7568531 DOI: 10.1038/s41467-020-19107-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Accepted: 09/25/2020] [Indexed: 12/03/2022] Open
Abstract
An enduring geological mystery concerns the missing xenon problem, referring to the abnormally low concentration of xenon compared to other noble gases in Earth's atmosphere. Identifying mantle minerals that can capture and stabilize xenon has been a great challenge in materials physics and xenon chemistry. Here, using an advanced crystal structure search algorithm in conjunction with first-principles calculations we find reactions of xenon with recently discovered iron peroxide FeO2, forming robust xenon-iron oxides Xe2FeO2 and XeFe3O6 with significant Xe-O bonding in a wide range of pressure-temperature conditions corresponding to vast regions in Earth's lower mantle. Calculated mass density and sound velocities validate Xe-Fe oxides as viable lower-mantle constituents. Meanwhile, Fe oxides do not react with Kr, Ar and Ne. It means that if Xe exists in the lower mantle at the same pressures as FeO2, xenon-iron oxides are predicted as potential Xe hosts in Earth's lower mantle and could provide the repository for the atmosphere's missing Xe. These findings establish robust materials basis, formation mechanism, and geological viability of these Xe-Fe oxides, which advance fundamental knowledge for understanding xenon chemistry and physics mechanisms for the possible deep-Earth Xe reservoir.
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Affiliation(s)
- Feng Peng
- College of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University, 471022, Luoyang, China
- Department of Chemistry and Biochemistry, California State University Northridge, Northridge, CA, 91330-8262, USA
| | - Xianqi Song
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 130012, Changchun, China
- Innovation Center for Computational Methods & Software, College of Physics, Jilin University, 130012, Changchun, China
| | - Chang Liu
- Innovation Center for Computational Methods & Software, College of Physics, Jilin University, 130012, Changchun, China
- International Center of Future Science, Jilin University, 130012, Changchun, China
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science, College of Materials Science and Engineering, Jilin University, 130012, Changchun, China
| | - Quan Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 130012, Changchun, China.
- Innovation Center for Computational Methods & Software, College of Physics, Jilin University, 130012, Changchun, China.
- International Center of Future Science, Jilin University, 130012, Changchun, China.
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science, College of Materials Science and Engineering, Jilin University, 130012, Changchun, China.
| | - Maosheng Miao
- Department of Chemistry and Biochemistry, California State University Northridge, Northridge, CA, 91330-8262, USA
| | - Changfeng Chen
- Department of Physics and Astronomy, University of Nevada, Las Vegas, NV, 89154, USA.
| | - Yanming Ma
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 130012, Changchun, China.
- Innovation Center for Computational Methods & Software, College of Physics, Jilin University, 130012, Changchun, China.
- International Center of Future Science, Jilin University, 130012, Changchun, China.
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7
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8
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Naden Robinson V, Hermann A. Plastic and superionic phases in ammonia-water mixtures at high pressures and temperatures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:184004. [PMID: 31914434 DOI: 10.1088/1361-648x/ab68f7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The interiors of giant icy planets depend on the properties of hot, dense mixtures of the molecular ices water, ammonia, and methane. Here, we discuss results from first-principles molecular dynamics simulations up to 500 GPa and 7000 K for four different ammonia-water mixtures that correspond to the stable stoichiometries found in solid ammonia hydrates. We show that all mixtures support the formation of plastic and superionic phases at elevated pressures and temperatures, before eventually melting into molecular or ionic liquids. All mixtures' melting lines are found to be close to the isentropes of Uranus and Neptune. Through local structure analyses we trace and compare the evolution of chemical composition and longevity of chemical species across the thermally activated states. Under specific conditions we find that protons can be less mobile in the fluid state than in the (colder, solid) superionic regime.
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Affiliation(s)
- Victor Naden Robinson
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3FD, United Kingdom. The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Strada Costiera 11, 34151, Italy
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9
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Britvin SN. Xenon in oxide frameworks: at the crossroads between inorganic chemistry and planetary science. Dalton Trans 2020; 49:5778-5782. [PMID: 32246760 DOI: 10.1039/d0dt00318b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chemistry of noble gases was for a long time dominated by fluoride-bearing compounds of xenon. However, the last two decades have brought new insights into the chemistry of xenon oxides and oxysalts, including insights involving a novel type of non-covalent interaction (aerogen bonding), discoveries of new xenon oxides, oxide perovskite frameworks and evidence for an abrupt increase of xenon reactivity under extreme pressure-temperature conditions. The complex implementation of these findings could facilitate the development of explanations for long-standing interdisciplinary problems, such as the depletion of heavy noble gases in contemporary planetary atmospheres - the cosmochemical enigma known as the "missing xenon" paradox.
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Affiliation(s)
- Sergey N Britvin
- Department of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, Universitetskaya Emb. 7/9, 199034 St. Petersburg, Russia.
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10
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Bai Y, Liu Z, Botana J, Yan D, Lin HQ, Sun J, Pickard CJ, Needs RJ, Miao MS. Electrostatic force driven helium insertion into ammonia and water crystals under pressure. Commun Chem 2019. [DOI: 10.1038/s42004-019-0204-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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11
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Yan XZ, Chen YM, Geng HY. Prediction of the Reactivity of Argon with Xenon under High Pressures. ACS OMEGA 2019; 4:13640-13644. [PMID: 31497681 PMCID: PMC6713989 DOI: 10.1021/acsomega.9b00638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 06/13/2019] [Indexed: 06/10/2023]
Abstract
Pressure significantly modifies the microscopic interactions in the condense phase, leading to new patterns of bonding and unconventional chemistry. Using unbiased structure searching techniques combined with first-principles calculations, we demonstrate the reaction of argon with xenon at a pressure as low as 1.1 GPa, producing a novel van der Waals compound XeAr2. This compound is a wide-gap insulator and crystallizes in a MgCu2-type Laves phase structure. The calculations of phonon spectra and formation enthalpy indicate that XeAr2 would be stable without any phase transition or decomposition at least up to 500 GPa.
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Affiliation(s)
- Xiao Z. Yan
- National
Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O.
Box 919-102, Mianyang 621900, Sichuan, People’s Republic
of China
- School
of Science, Jiangxi University of Science
and Technology, Ganzhou 341000, Jiangxi, People’s
Republic of China
| | - Yang M. Chen
- National
Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O.
Box 919-102, Mianyang 621900, Sichuan, People’s Republic
of China
- School
of Science, Jiangxi University of Science
and Technology, Ganzhou 341000, Jiangxi, People’s
Republic of China
| | - Hua Y. Geng
- National
Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O.
Box 919-102, Mianyang 621900, Sichuan, People’s Republic
of China
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12
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Naden Robinson V, Marqués M, Wang Y, Ma Y, Hermann A. Novel phases in ammonia-water mixtures under pressure. J Chem Phys 2018; 149:234501. [DOI: 10.1063/1.5063569] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- Victor Naden Robinson
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - Miriam Marqués
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - Yanchao Wang
- State Key Laboratory for Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Innovation Center for Computational Physics Methods and Software, College of Physics, Jilin University, Changchun 130012, China
| | - Yanming Ma
- State Key Laboratory for Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Innovation Center for Computational Physics Methods and Software, College of Physics, Jilin University, Changchun 130012, China
- International Center for Future Science, Jilin University, Changchun 130012, China
| | - Andreas Hermann
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
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13
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Liu Z, Botana J, Hermann A, Valdez S, Zurek E, Yan D, Lin HQ, Miao MS. Reactivity of He with ionic compounds under high pressure. Nat Commun 2018; 9:951. [PMID: 29507302 PMCID: PMC5838161 DOI: 10.1038/s41467-018-03284-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 02/02/2018] [Indexed: 11/26/2022] Open
Abstract
Until very recently, helium had remained the last naturally occurring element that was known not to form stable solid compounds. Here we propose and demonstrate that there is a general driving force for helium to react with ionic compounds that contain an unequal number of cations and anions. The corresponding reaction products are stabilized not by local chemical bonds but by long-range Coulomb interactions that are significantly modified by the insertion of helium atoms, especially under high pressure. This mechanism also explains the recently discovered reactivity of He and Na under pressure. Our work reveals that helium has the propensity to react with a broad range of ionic compounds at pressures as low as 30 GPa. Since most of the Earth’s minerals contain unequal numbers of positively and negatively charged atoms, our work suggests that large quantities of He might be stored in the Earth’s lower mantle. Helium was long thought to be unable to form stable solid compounds, until a recent discovery that helium reacts with sodium at high pressure. Here, the authors demonstrate the driving force for helium reactivity, showing that it can form new compounds under pressure without forming any local chemical bonds.
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Affiliation(s)
- Zhen Liu
- Beijing Computational Science Research Centre, Beijing, 100193, China.,Department of Physics, Beijing Normal University, Beijing, 100875, China.,Department of Chemistry and Biochemistry, California State University Northridge, Northridge, CA, 91330-8262, USA
| | - Jorge Botana
- Beijing Computational Science Research Centre, Beijing, 100193, China.,Department of Chemistry and Biochemistry, California State University Northridge, Northridge, CA, 91330-8262, USA
| | - Andreas Hermann
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh, EH9 3FD, UK
| | - Steven Valdez
- Department of Chemistry and Biochemistry, California State University Northridge, Northridge, CA, 91330-8262, USA
| | - Eva Zurek
- Department of Chemistry, State University of New York at Buffalo, Buffalo, NY, 14260-3000, USA
| | - Dadong Yan
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Hai-Qing Lin
- Beijing Computational Science Research Centre, Beijing, 100193, China
| | - Mao-Sheng Miao
- Beijing Computational Science Research Centre, Beijing, 100193, China. .,Department of Chemistry and Biochemistry, California State University Northridge, Northridge, CA, 91330-8262, USA.
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14
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High-Pressure Reactivity of Kr and F2—Stabilization of Krypton in the +4 Oxidation State. CRYSTALS 2017. [DOI: 10.3390/cryst7110329] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Abstract
The interior structure of the giant ice planets Uranus and Neptune, but also of newly discovered exoplanets, is loosely constrained, because limited observational data can be satisfied with various interior models. Although it is known that their mantles comprise large amounts of water, ammonia, and methane ices, it is unclear how these organize themselves within the planets-as homogeneous mixtures, with continuous concentration gradients, or as well-separated layers of specific composition. While individual ices have been studied in great detail under pressure, the properties of their mixtures are much less explored. We show here, using first-principles calculations, that the 2:1 ammonia hydrate, (H2O)(NH3)2, is stabilized at icy planet mantle conditions due to a remarkable structural evolution. Above 65 GPa, we predict it will transform from a hydrogen-bonded molecular solid into a fully ionic phase O2-([Formula: see text])2, where all water molecules are completely deprotonated, an unexpected bonding phenomenon not seen before. Ammonia hemihydrate is stable in a sequence of ionic phases up to 500 GPa, pressures found deep within Neptune-like planets, and thus at higher pressures than any other ammonia-water mixture. This suggests it precipitates out of any ammonia-water mixture at sufficiently high pressures and thus forms an important component of icy planets.
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16
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Chen Y, Geng HY, Yan X, Sun Y, Wu Q, Chen X. Prediction of Stable Ground-State Lithium Polyhydrides under High Pressures. Inorg Chem 2017; 56:3867-3874. [DOI: 10.1021/acs.inorgchem.6b02709] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yangmei Chen
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
- Institute
of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan People’s Republic of China, 610065
| | - Hua Y. Geng
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
| | - Xiaozhen Yan
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
- Institute
of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan People’s Republic of China, 610065
- School
of Science, Jiangxi University of Science and Technology, Ganzhou, Jiangxi People’s Republic of China, 341000
| | - Yi Sun
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
| | - Qiang Wu
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
| | - Xiangrong Chen
- Institute
of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan People’s Republic of China, 610065
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17
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A stable compound of helium and sodium at high pressure. Nat Chem 2017; 9:440-445. [DOI: 10.1038/nchem.2716] [Citation(s) in RCA: 217] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 12/06/2016] [Indexed: 12/23/2022]
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18
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Hou C, Wang X, Botana J, Miao M. Noble gas bond and the behaviour of XeO3under pressure. Phys Chem Chem Phys 2017; 19:27463-27467. [DOI: 10.1039/c7cp05385a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The covalent Xe–O bond lengths in XeO3are elongated upon increasing the pressure, which is similar to the change observed with hydrogen bonds under pressure. Moreover, XeO3rearranges in a highly-ordered manner by O hopping at about 2 GPa, which is analogous to the proton hopping observed among hydrogen bonds.
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Affiliation(s)
- Chunju Hou
- School of Science
- JiangXi University of Science and Technology
- Ganzhou
- P. R. China
- Beijing Computational Science Research Center
| | - Xianlong Wang
- Key Laboratory of Materials Physics
- Institute of Solid State Physics
- Chinese Academy of Science
- Hefei
- P. R. China
| | - Jorge Botana
- Beijing Computational Science Research Center
- Beijing 100094
- P. R. China
- Department of Chemistry and Biochemistry California State University Northridge
- USA
| | - Maosheng Miao
- Department of Chemistry and Biochemistry California State University Northridge
- USA
- Beijing Computational Science Research Center
- Beijing 100094
- P. R. China
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19
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Dewaele A, Worth N, Pickard CJ, Needs RJ, Pascarelli S, Mathon O, Mezouar M, Irifune T. Synthesis and stability of xenon oxides Xe2O5 and Xe3O2 under pressure. Nat Chem 2016; 8:784-90. [DOI: 10.1038/nchem.2528] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 04/16/2016] [Indexed: 01/22/2023]
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20
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Shamp A, Terpstra T, Bi T, Falls Z, Avery P, Zurek E. Decomposition Products of Phosphine Under Pressure: PH2 Stable and Superconducting? J Am Chem Soc 2016; 138:1884-92. [PMID: 26777416 DOI: 10.1021/jacs.5b10180] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Evolutionary algorithms (EAs) coupled with density functional theory (DFT) calculations have been used to predict the most stable hydrides of phosphorus (PHn, n = 1-6) at 100, 150, and 200 GPa. At these pressures phosphine is unstable with respect to decomposition into the elemental phases, as well as PH2 and H2. Three metallic PH2 phases were found to be dynamically stable and superconducting between 100 and 200 GPa. One of these contains five formula units in the primitive cell and has C2/m symmetry (5FU-C2/m). It comprises 1D periodic PH3-PH-PH2-PH-PH3 oligomers. Two structurally related phases consisting of phosphorus atoms that are octahedrally coordinated by four phosphorus atoms in the equatorial positions and two hydrogen atoms in the axial positions (I4/mmm and 2FU-C2/m) were the most stable phases between ∼160-200 GPa. Their superconducting critical temperatures (Tc) were computed as 70 and 76 K, respectively, via the Allen-Dynes modified McMillan formula and using a value of 0.1 for the Coulomb pseudopotential, μ*. Our results suggest that the superconductivity recently observed by Drozdov, Eremets, and Troyan when phosphine was subject to pressures of 207 GPa in a diamond anvil cell may result from these, and other, decomposition products of phosphine.
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Affiliation(s)
- Andrew Shamp
- Department of Chemistry, State University of New York at Buffalo , Buffalo, New York 14260-3000, United States
| | - Tyson Terpstra
- Department of Chemistry, State University of New York at Buffalo , Buffalo, New York 14260-3000, United States
| | - Tiange Bi
- Department of Chemistry, State University of New York at Buffalo , Buffalo, New York 14260-3000, United States
| | - Zackary Falls
- Department of Chemistry, State University of New York at Buffalo , Buffalo, New York 14260-3000, United States
| | - Patrick Avery
- Department of Chemistry, State University of New York at Buffalo , Buffalo, New York 14260-3000, United States
| | - Eva Zurek
- Department of Chemistry, State University of New York at Buffalo , Buffalo, New York 14260-3000, United States
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21
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Kurzydłowski D, Zaleski-Ejgierd P. High-pressure stabilization of argon fluorides. Phys Chem Chem Phys 2016; 18:2309-13. [PMID: 26742478 DOI: 10.1039/c5cp05725f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
On account of the rapid development of noble gas chemistry in the past half-century both xenon and krypton compounds can now be isolated in macroscopic quantities. The same does not hold true for the next lighter group 18 element, argon, which forms only isolated molecules stable solely in low temperature matrices or supersonic jet streams. Here we present theoretical investigations into a new high-pressure reaction pathway, which enables synthesis of argon fluorides in bulk and at room temperature. Our hybrid DFT calculations (employing the HSE06 functional) indicate that above 60 GPa ArF2-containing molecular crystals can be obtained by a reaction between argon and molecular fluorine.
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Affiliation(s)
- Dominik Kurzydłowski
- Centre of New Technologies, University of Warsaw, ul. S. Banacha 2c, 02-097, Warsaw, Poland. and Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszynski University in Warsaw, ul. K. Wóycickiego 1/3, 01-938, Warsaw, Poland
| | - Patryk Zaleski-Ejgierd
- Institute of Physical Chemistry, Polish Academy of Sciences, ul. M. Kasprzaka 44/52 01-224, Warsaw, Poland.
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22
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Hermann A, Derzsi M, Grochala W, Hoffmann R. AuO: Evolving from Dis- to Comproportionation and Back Again. Inorg Chem 2016; 55:1278-86. [DOI: 10.1021/acs.inorgchem.5b02528] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andreas Hermann
- Centre for Science at Extreme Conditions
and School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom
| | - Mariana Derzsi
- Centre
for New Technologies, University of Warsaw, Żwirki i Wigury 93, 02089 Warsaw, Poland
| | - Wojciech Grochala
- Centre
for New Technologies, University of Warsaw, Żwirki i Wigury 93, 02089 Warsaw, Poland
| | - Roald Hoffmann
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14850, United States
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23
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Hermann A. High-pressure phase transitions in rubidium and caesium hydroxides. Phys Chem Chem Phys 2016; 18:16527-34. [PMID: 27271485 DOI: 10.1039/c6cp03203f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First-principles calculations on the phase evolution of RbOH and CsOH under compression suggest new high-pressure phases in both compounds.
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Affiliation(s)
- Andreas Hermann
- Centre for Science at Extreme Conditions and SUPA
- School of Physics and Astronomy
- The University of Edinburgh
- Edinburgh
- UK
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24
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Miao MS, Wang XL, Brgoch J, Spera F, Jackson MG, Kresse G, Lin HQ. Anionic Chemistry of Noble Gases: Formation of Mg–NG (NG = Xe, Kr, Ar) Compounds under Pressure. J Am Chem Soc 2015; 137:14122-8. [DOI: 10.1021/jacs.5b08162] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mao-sheng Miao
- Department
of Chemistry and Biochemistry, California State University, Northridge, California 91330, United States
- Beijing Computational Science Research Center, Beijing 10094, P. R. China
| | - Xiao-li Wang
- Institute
of Condensed Matter Physics, Linyi University, Linyi 276005, P. R. China
- Department
of Earth Science, University of California, Santa Barbara, California 93106, United States
| | - Jakoah Brgoch
- Department
of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Frank Spera
- Department
of Earth Science, University of California, Santa Barbara, California 93106, United States
| | - Matthew G. Jackson
- Department
of Earth Science, University of California, Santa Barbara, California 93106, United States
| | - Georg Kresse
- Faculty
of
Physics, University of Vienna, Sensengasse 8/12 A-1090 Wien, Austria
| | - Hai-qing Lin
- Beijing Computational Science Research Center, Beijing 10094, P. R. China
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25
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Abstract
Evolutionary structure searches predict three new phases of iodine polyhydrides stable under pressure. Insulating P1-H5I, consisting of zigzag chains of (HI)δ+ and H2 δ− molecules, is stable between 30 and 90 GPa. Cmcm-H2I and P6/mmm-H4I are found on the 100, 150, and 200 GPa convex hulls. These two phases are good metals, even at 1 atm, because they consist of monatomic lattices of iodine. At 100 GPa the superconducting transition temperature, Tc, of H2I and H4I is estimated to be 7.8 and 17.5 K, respectively. The increase in Tc relative to elemental iodine results from a larger ωlog from the light mass of hydrogen and an enhanced λ from modes containing H/I and H/H vibrations.
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Affiliation(s)
- Andrew Shamp
- Department of Chemistry, State University of New York at Buffalo , 331 Natural Sciences Complex, Buffalo, New York 14260-3000, United States
| | - Eva Zurek
- Department of Chemistry, State University of New York at Buffalo , 331 Natural Sciences Complex, Buffalo, New York 14260-3000, United States
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