251
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Abstract
We propose modifications to the functional form of the Strongly Constrained and Appropriately Normed (SCAN) density functional to eliminate numerical instabilities. This is necessary to allow reliable, automatic generation of pseudopotentials (including projector augmented-wave potentials). The regularized SCAN is designed to match the original form very closely, and we show that its performance remains comparable.
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Affiliation(s)
- Albert P Bartók
- Rutherford Appleton Laboratory, Scientific Computing Department Science and Technology Facilities Council, Didcot OX11 0QX, United Kingdom
| | - Jonathan R Yates
- Department of Materials University of Oxford, Oxford OX1 3PH, United Kingdom
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252
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Zhu W, Huang Y, Zhu C, Wu HH, Wang L, Bai J, Yang J, Francisco JS, Zhao J, Yuan LF, Zeng XC. Room temperature electrofreezing of water yields a missing dense ice phase in the phase diagram. Nat Commun 2019; 10:1925. [PMID: 31028288 PMCID: PMC6486617 DOI: 10.1038/s41467-019-09950-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 04/05/2019] [Indexed: 11/14/2022] Open
Abstract
Water can freeze into diverse ice polymorphs depending on the external conditions such as temperature (T) and pressure (P). Herein, molecular dynamics simulations show evidence of a high-density orthorhombic phase, termed ice χ, forming spontaneously from liquid water at room temperature under high-pressure and high external electric field. Using free-energy computations based on the Einstein molecule approach, we show that ice χ is an additional phase introduced to the state-of-the-art T–P phase diagram. The χ phase is the most stable structure in the high-pressure/low-temperature region, located between ice II and ice VI, and next to ice V exhibiting two triple points at 6.06 kbar/131.23 K and 9.45 kbar/144.24 K, respectively. A possible explanation for the missing ice phase in the T–P phase diagram is that ice χ is a rare polarized ferroelectric phase, whose nucleation/growth occurs only under very high electric fields. Water can crystallize in different ice polymorphs according to temperature and pressure conditions. Here the authors predict by molecular dynamics simulations a new ice phase spontaneously forming at room temperature under high pressure and high electric field.
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Affiliation(s)
- Weiduo Zhu
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.,Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA
| | - Yingying Huang
- Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA.,Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian, 116024, China.,Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China
| | - Chongqin Zhu
- Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA
| | - Hong-Hui Wu
- Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA
| | - Lu Wang
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Jaeil Bai
- Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA
| | - Jinlong Yang
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Joseph S Francisco
- Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian, 116024, China.
| | - Lan-Feng Yuan
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Xiao Cheng Zeng
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China. .,Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA. .,Department of Chemical & Biomolecular Engineering and Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE, 68588, USA.
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253
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Mahlberg D, Sakong S, Forster-Tonigold K, Groß A. Improved DFT Adsorption Energies with Semiempirical Dispersion Corrections. J Chem Theory Comput 2019; 15:3250-3259. [DOI: 10.1021/acs.jctc.9b00035] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- David Mahlberg
- Institute of Theoretical Chemistry, Ulm University, 89069 Ulm, Germany
| | - Sung Sakong
- Institute of Theoretical Chemistry, Ulm University, 89069 Ulm, Germany
| | - Katrin Forster-Tonigold
- Helmholtz Institute Ulm (HIU) for Electrochemical Energy Storage, 89069 Ulm, Germany
- Karlsruhe Institute of Technology (KIT), P.O. Box
3640, 76021 Karlsruhe, Germany
| | - Axel Groß
- Institute of Theoretical Chemistry, Ulm University, 89069 Ulm, Germany
- Helmholtz Institute Ulm (HIU) for Electrochemical Energy Storage, 89069 Ulm, Germany
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254
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Arcelus O, Carrasco J. Atomistic Insight into Glide-Driven Phase Transformations in Layered Oxides for Sodium-Ion Batteries: A Case Study on Na xVO 2. ACS APPLIED MATERIALS & INTERFACES 2019; 11:12562-12569. [PMID: 30860350 DOI: 10.1021/acsami.9b01484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Among high-capacity, low-cost cathode contenders for Na-ion batteries, layered transition-metal oxides are particularly promising materials. Yet there is a strong need to improve their long-term stability and capacity retention due to unwanted phase transitions occurring during sodium insertion and extraction cycles. Here, using density functional theory calculations and thoroughly examining P ↔ O transitions in Na xVO2 as a case study, we provide atomic-level understanding into the glide-driven processes in these compounds. In particular, we rationalize the commonly observed effect of high Na contents on preventing gliding processes at low states of charge. And we identify the beneficial impact of Na ions at face-shared prismatic sites in P-type phases to specifically hinder P → O transitions. We put forward that the gained new insights can help to focus and guide the current research efforts to design layered transition-metal oxides with enhanced long-term stability for practical applications.
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Affiliation(s)
- Oier Arcelus
- CIC EnergiGUNE, Parque Tecnológico de Álava , Albert Einstein 48 , 01510 Miñano , Álava , Spain
| | - Javier Carrasco
- CIC EnergiGUNE, Parque Tecnológico de Álava , Albert Einstein 48 , 01510 Miñano , Álava , Spain
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255
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Yong W, Lekin K, Bauer RPC, Tse JS, Desgreniers S, Secco RA, Hirao N, Oakley RT. Pancakes under Pressure: A Case Study on Isostructural Dithia- and Diselenadiazolyl Radical Dimers. Inorg Chem 2019; 58:3550-3557. [PMID: 30785745 DOI: 10.1021/acs.inorgchem.9b00142] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The isostructural dimers of the 1,4-phenylene-bridged bis-1,2,3,5-dithia- and bis-1,2,3,5-diselenadiazolyl diradicals 1,4-S/Se are small band gap semiconductors. The response of their molecular and solid state electronic structures to pressure has been explored over the range 0-10 GPa. The crystal structures, which consist of cofacially aligned (pancake) π-dimers packed into herringbone arrays, experience a continuous, near-isotropic compression. While the intramolecular covalent E-E (E = S/Se) bonds remain relatively unchanged with pressurization, the intradimer E···E separations are significantly shortened. Molecular and band electronic structure calculations using density functional theory methods indicate that compression of the π-dimers leads to a widening of the gap Δ E between the highest occupied and lowest unoccupied molecular orbitals of the dimer, an effect that offsets the expected decrease in the valence-to-conduction band gap Eg occasioned by pressure-induced spreading of the valence and conduction bands. Consistent with the predicted consequences of this competition between intra- and interdimer interactions, variable temperature high pressure conductivity measurements reveal at best an order-of-magnitude increase in conductivity with pressure for the two compounds over the pressure range 0-10 GPa. While a small reduction in the thermal activation energy Eact with increasing pressure is observed, extrapolation of the rate of decrease suggests a projected onset of metallization ( Eact ≈ 0) in excess of 20 GPa.
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Affiliation(s)
- Wenjun Yong
- Department of Earth Sciences , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Kristina Lekin
- Department of Chemistry , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| | - Robert P C Bauer
- Department of Physics , University of Saskatchewan , Saskatoon , Saskatchewan S7N 5E2 , Canada
| | - John S Tse
- Department of Physics , University of Saskatchewan , Saskatoon , Saskatchewan S7N 5E2 , Canada
| | - Serge Desgreniers
- Department of Physics , University of Ottawa , Ottawa , Ontario K1N 6N5 , Canada
| | - Richard A Secco
- Department of Earth Sciences , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Naohisa Hirao
- Materials Science Division , Japan Synchrotron Radiation Research Institute , SPring-8, Sayo , Hyogo 679-5198 , Japan
| | - Richard T Oakley
- Department of Chemistry , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
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256
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Mucha E, Stuckmann A, Marianski M, Struwe WB, Meijer G, Pagel K. In-depth structural analysis of glycans in the gas phase. Chem Sci 2019; 10:1272-1284. [PMID: 30809341 PMCID: PMC6357860 DOI: 10.1039/c8sc05426f] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 01/04/2019] [Indexed: 12/26/2022] Open
Abstract
Although there have been substantial improvements in glycan analysis over the past decade, the lack of both high-resolution and high-throughput methods hampers progress in glycomics. This perspective article highlights the current developments of liquid chromatography, mass spectrometry, ion-mobility spectrometry and cryogenic IR spectroscopy for glycan analysis and gives a critical insight to their individual strengths and limitations. Moreover, we discuss a novel concept in which ion mobility-mass spectrometry and cryogenic IR spectroscopy is combined in a single instrument such that datasets consisting of m/z, collision cross sections and IR fingerprints can be obtained. This multidimensional data will then be compared to a comprehensive reference library of intact glycans and their fragments to accurately identify unknown glycans on a high-throughput scale with minimal sample requirements. Due to the complementarity of the obtained information, this novel approach is highly diagnostic and also suitable for the identification of larger glycans; however, the workflow and instrumentation is straightforward enough to be implemented into a user-friendly setup.
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Affiliation(s)
- Eike Mucha
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany .
- Institute of Chemistry and Biochemistry , Freie Universität Berlin , Takustraße 3 , 14195 Berlin , Germany
| | - Alexandra Stuckmann
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany .
- Institute of Chemistry and Biochemistry , Freie Universität Berlin , Takustraße 3 , 14195 Berlin , Germany
| | - Mateusz Marianski
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany .
| | - Weston B Struwe
- Oxford Glycobiology Institute , Department of Biochemistry , University of Oxford , OX1 3QU Oxford , UK
| | - Gerard Meijer
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany .
| | - Kevin Pagel
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany .
- Institute of Chemistry and Biochemistry , Freie Universität Berlin , Takustraße 3 , 14195 Berlin , Germany
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257
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Franco Pinheiro Moreira PA, Gomes de Aguiar Veiga R, de Koning M. Elastic constants of ice Ihas described by semi-empirical water models. J Chem Phys 2019; 150:044503. [DOI: 10.1063/1.5082743] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Affiliation(s)
| | - Roberto Gomes de Aguiar Veiga
- Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Santo André, 09210-580 São Paulo, Brazil
| | - Maurice de Koning
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, UNICAMP, Campinas, 13083-859 São Paulo, Brazil
- Center for Computing in Engineering & Sciences, Universidade Estadual de Campinas, UNICAMP, Campinas, 13083-861 São Paulo, Brazil
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258
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Zhang Y, Furness JW, Xiao B, Sun J. Subtlety of TiO2 phase stability: Reliability of the density functional theory predictions and persistence of the self-interaction error. J Chem Phys 2019; 150:014105. [PMID: 30621425 DOI: 10.1063/1.5055623] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yubo Zhang
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - James W. Furness
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - Bing Xiao
- State Key Laboratory of Electric Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
| | - Jianwei Sun
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
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259
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Yang X, Dai Z, Zhao Y, Niu W, Liu J, Meng S. Pressure induced excellent thermoelectric behavior in skutterudites CoSb 3 and IrSb 3. Phys Chem Chem Phys 2019; 21:851-858. [PMID: 30556552 DOI: 10.1039/c8cp04301a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Utilizing the first-principle calculations combined with Boltzmann transport equation (BTE) and semiclassical analysis, we have systematically investigated the electronic structure, lattice thermal conductivity κL, Seebeck coefficient S, and the dimensionless figure of merit zT as a function of hydrostatic pressure P in crystalline skutterudites CoSb3 and IrSb3. Interestingly, as the pressure increases, the band gap and κL show an approximate parabolic trend, which results in extraordinarily high S and excellent thermoelectric properties, and zT even exceeds 1.4(1.09) in IrSb3(CoSb3) at 54(58) GPa. This anomalous behavior arises from the electron distribution and intrinsic scattering processes. Further analyses indicate that (i) nonbonding electron pairs of Sb atoms are gradually transferred to the region between Co(Ir) and Sb atoms as the pressure increases, which leads to the formation of a partial metallic bond and thus the band gap first expands and then shrinks; (ii) the change of the strength of the anharmonic phonon scattering process results in the variation of κL. As a result, these behaviors cause excellent thermoelectric properties. Our results provide insight into the thermal transport properties of skutterudites, meanwhile, forecast potential high pressure applications for thermoelectric materials.
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Affiliation(s)
- Xiuxian Yang
- Department of Physics, Yantai University, Yantai 264005, People's Republic of China.
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260
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Tsatsoulis T, Sakong S, Groß A, Grüneis A. Reaction energetics of hydrogen on Si(100) surface: A periodic many-electron theory study. J Chem Phys 2018; 149:244105. [DOI: 10.1063/1.5055706] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Theodoros Tsatsoulis
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
- Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
| | - Sung Sakong
- Institute of Theoretical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Axel Groß
- Institute of Theoretical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Andreas Grüneis
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
- Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
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261
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Bonati L, Parrinello M. Silicon Liquid Structure and Crystal Nucleation from Ab Initio Deep Metadynamics. PHYSICAL REVIEW LETTERS 2018; 121:265701. [PMID: 30636123 DOI: 10.1103/physrevlett.121.265701] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Indexed: 06/09/2023]
Abstract
Studying the crystallization process of silicon is a challenging task since empirical potentials are not able to reproduce well the properties of both a semiconducting solid and metallic liquid. On the other hand, nucleation is a rare event that occurs in much longer timescales than those achievable by ab initio molecular dynamics. To address this problem, we train a deep neural network potential based on a set of data generated by metadynamics simulations using a classical potential. We show how this is an effective way to collect all the relevant data for the process of interest. In order to efficiently drive the crystallization process, we introduce a new collective variable based on the Debye structure factor. We are able to encode the long-range order information in a local variable which is better suited to describe the nucleation dynamics. The reference energies are then calculated using the strongly constrained and appropriately normed (SCAN) exchange-correlation functional, which is able to get a better description of the bonding complexity of the Si phase diagram. Finally, we recover the free energy surface with a density functional theory accuracy, and we compute the thermodynamics properties near the melting point, obtaining a good agreement with experimental data. In addition, we study the early stages of the crystallization process, unveiling features of the nucleation mechanism.
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Affiliation(s)
- Luigi Bonati
- Department of Physics, ETH Zurich, c/o Università della Svizzera italiana, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
- Facoltà di Informatica, Instituto di Scienze Computazionali, National Center for Computational Design and Discovery of Novel Materials (MARVEL), Università della Svizzera italiana, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
| | - Michele Parrinello
- Facoltà di Informatica, Instituto di Scienze Computazionali, National Center for Computational Design and Discovery of Novel Materials (MARVEL), Università della Svizzera italiana, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
- Department of Chemistry and Applied Biosciences, ETH Zurich, c/o Università della Svizzera italiana, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
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262
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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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263
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Mazierski P, Sowik J, Miodyńska M, Trykowski G, Mikołajczyk A, Klimczuk T, Lisowski W, Nadolna J, Zaleska-Medynska A. Shape-controllable synthesis of GdVO 4 photocatalysts and their tunable properties in photocatalytic hydrogen generation. Dalton Trans 2018; 48:1662-1671. [PMID: 30564826 DOI: 10.1039/c8dt04225j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Novel visible light responsive materials for water splitting are essential for the efficient conversion of solar energy into hydrogen bond energy. Among other semiconductors, gadolinium orthovanadate has appropriate conduction and valence band edges positioned to split water molecules and a narrow band gap that allows the use of visible light for hydrogen generation. Thus, we present here that hydrogen evolution under visible light (λ > 420 nm) could be accomplished using hierarchical 3D GdVO4 particles, obtained by a simple, one pot hydrothermal synthesis. We found that applying various reaction components, such as EDTA-Na2 and EDTA, and adjusting the pH of the solution allow one to tune the shape of GdVO4 (such as short nanowires, long nanowires, short nanorods, long nanorods, nanoparticles and spheres - all having a tetragonal crystal structure) as well as optical and photocatalytic properties. The highest ability to photocatalytically split methanol solution into hydrogen under UV-Vis irradiation was detected for the long nanowire sample (42 μmol h-1), having almost 11 times higher efficiency in comparison with the weakest sample - short nanowires. In addition, GdVO4 spheres generated H2 more than 2 times (5.75 μmol h-1) in comparison with the short nanorod sample (2.5 μmol h-1) under visible light excitation. Photostable in three-hour work cycles, long nanowires and spheres were even able to generate hydrogen from pure water, reaching values of 17 and 3 μmol under UV-Vis and Vis light, respectively.
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Affiliation(s)
- Paweł Mazierski
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland.
| | - Jakub Sowik
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland.
| | - Magdalena Miodyńska
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland.
| | - Grzegorz Trykowski
- Faculty of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland
| | - Alicja Mikołajczyk
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland.
| | - Tomasz Klimczuk
- Department of Solid State Physics, Gdansk University of Technology, 80-233 Gdansk, Poland
| | - Wojciech Lisowski
- Institute of Physical Chemistry, Polish Academy of Science, 01-224 Warsaw, Poland
| | - Joanna Nadolna
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland.
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264
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Calegari Andrade MF, Ko HY, Car R, Selloni A. Structure, Polarization, and Sum Frequency Generation Spectrum of Interfacial Water on Anatase TiO 2. J Phys Chem Lett 2018; 9:6716-6721. [PMID: 30388372 DOI: 10.1021/acs.jpclett.8b03103] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The photocatalytic activity of TiO2 for water splitting has been known for decades, yet the adsorption structure and hydrogen bonding of water at the interface with TiO2 have remained controversial. We investigate the prototypical aqueous interface with anatase TiO2 (101) using ab initio molecular dynamics (AIMD) with the strongly constrained and appropriately normed (SCAN) density functional, recently shown to provide an excellent description of the properties of bulk liquid water. We find that water forms a stable bilayer of intact molecules with ice-like dynamics and enhanced dipole moment and polarizability on the anatase surface. The orientational order and H-bond environment of interfacial water are reflected in the computed sum frequency generation (SFG) spectrum, which agrees well with recent measurements in the OH stretching frequency range (3000-3600 cm-1). Additional AIMD simulations for a model interface with 66% of dissociated water in the contact layer show that surface hydroxyls disrupt the order in the bilayer and lead to a much faster orientational dynamics of interfacial water. Nonetheless, the computed SFG spectrum for the hydroxylated surface also agrees with experiment, suggesting that SFG measurements in a wider frequency range would be necessary to unambiguously identify the character of interfacial water on anatase.
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Affiliation(s)
| | - Hsin-Yu Ko
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States
| | - Roberto Car
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States
| | - Annabella Selloni
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States
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265
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Xing W, Zhang Y, Meng F, Wang C, Tao Q, Zhu P, Zhu J, Yu R. Structure stabilization effect of configuration entropy in cubic WN. Phys Chem Chem Phys 2018; 20:29243-29248. [PMID: 30427344 DOI: 10.1039/c8cp05320k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The microscopic structure of cubic WN has been studied combining scanning transmission electron microscopy and first-principles calculations. Because of the contribution of configurational entropy, NaCl-type WN with disordered vacancies becomes more stable at high temperatures than NbO-type WN. Moreover, electron beam irradiation can induce an order-disorder transition in cubic WN. It is suggested that the ordered NbO-type WN can be obtained after annealing below the transition temperature. The results shed light on the stability of materials synthesized at high pressures and high temperatures.
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Affiliation(s)
- Wandong Xing
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Key Laboratory of Advanced Materials of Ministry of Education of China, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China.
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266
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Liu L, Lee W, Yuan M, Gutierrez O. Mechanisms of Bisphosphine Iron-Catalyzed C(SP2)-C(SP3) Cross-Coupling Reactions: Inner-Sphere or Outer-Sphere Arylation? COMMENT INORG CHEM 2018. [DOI: 10.1080/02603594.2018.1539392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Lei Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA
| | - Wes Lee
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA
| | - Mingbin Yuan
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA
| | - Osvaldo Gutierrez
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA
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267
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Tuning the balance between dispersion and entropy to design temperature-responsive flexible metal-organic frameworks. Nat Commun 2018; 9:4899. [PMID: 30464249 PMCID: PMC6249296 DOI: 10.1038/s41467-018-07298-4] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 10/25/2018] [Indexed: 11/09/2022] Open
Abstract
Temperature-responsive flexibility in metal-organic frameworks (MOFs) appeals to the imagination. The ability to transform upon thermal stimuli while retaining a given crystalline topology is desired for specialized sensors and actuators. However, rational design of such shape-memory nanopores is hampered by a lack of knowledge on the nanoscopic interactions governing the observed behavior. Using the prototypical MIL-53(Al) as a starting point, we show that the phase transformation between a narrow-pore and large-pore phase is determined by a delicate balance between dispersion stabilization at low temperatures and entropic effects at higher ones. We present an accurate theoretical framework that allows designing breathing thermo-responsive MOFs, based on many-electron data for the dispersion interactions and density-functional theory entropy contributions. Within an isoreticular series of materials, MIL-53(Al), MIL-53(Al)-FA, DUT-4, DUT-5 and MIL-53(Ga), only MIL-53(Al) and MIL-53(Ga) are proven to switch phases within a realistic temperature range. Rational design of metal organic frameworks (MOFs) with shape-memory nanopores is a formidable challenge. Here the authors use an accurate theoretical approach to design thermo-responsive MOFs based on a balance of van der Waals and entropy contributions.
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268
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Fu Y, Singh DJ. Applicability of the Strongly Constrained and Appropriately Normed Density Functional to Transition-Metal Magnetism. PHYSICAL REVIEW LETTERS 2018; 121:207201. [PMID: 30500246 DOI: 10.1103/physrevlett.121.207201] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Indexed: 06/09/2023]
Abstract
We find that the recently developed self-consistent and appropriately normed meta-generalized gradient approximation, which has been found to provide highly accurate results for many materials, is, however, not able to describe the stability and properties of phases of Fe important for steel. This is due to an overestimated tendency toward magnetism and exaggeration of magnetic energies, which we also find in other transition metals.
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Affiliation(s)
- Yuhao Fu
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211-7010, USA
| | - David J Singh
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211-7010, USA
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269
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Dorner F, Sukurma Z, Dellago C, Kresse G. Melting Si: Beyond Density Functional Theory. PHYSICAL REVIEW LETTERS 2018; 121:195701. [PMID: 30468598 DOI: 10.1103/physrevlett.121.195701] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Indexed: 06/09/2023]
Abstract
The melting point of silicon in the cubic diamond phase is calculated using the random phase approximation (RPA). The RPA includes exact exchange as well as an approximate treatment of local as well as nonlocal many body correlation effects of the electrons. We predict a melting temperature of about 1735 and 1640 K without and with core polarization effects, respectively. Both values are within 3% of the experimental melting temperature of 1687 K. In comparison, the commonly used gradient approximation to density functional theory predicts a melting point that is 200 K too low, and hybrid functionals overestimate the melting point by 150 K. We correlate the predicted melting point with the energy difference between cubic diamond and the beta-tin phase of silicon, establishing that this energy difference is an important benchmark for the development of approximate functionals. The current results demonstrate that the RPA can be used to predict accurate finite temperature properties and underlines the excellent predictive properties of the RPA for condensed matter.
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Affiliation(s)
- Florian Dorner
- University of Vienna, Faculty of Physics and Center for Computational Materials Sciences, Sensengasse 8/12, 1090 Wien, Austria
| | - Zoran Sukurma
- University of Vienna, Faculty of Physics and Center for Computational Materials Sciences, Sensengasse 8/12, 1090 Wien, Austria
| | - Christoph Dellago
- University of Vienna, Faculty of Physics and Center for Computational Materials Sciences, Sensengasse 8/12, 1090 Wien, Austria
| | - Georg Kresse
- University of Vienna, Faculty of Physics and Center for Computational Materials Sciences, Sensengasse 8/12, 1090 Wien, Austria
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270
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Zhang H, Deng B, Wang WC, Shi XQ. Parity-breaking in single-element phases: ferroelectric-like elemental polar metals. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:415504. [PMID: 30178760 DOI: 10.1088/1361-648x/aadeaa] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Polar metals based on binary and ternary compounds have been demonstrated in literature. Here, we propose a design principle for ferroelectric-like elemental polar metals and relate it to real materials. The design principle is that, to be an elemental polar metal, atoms should occupy at least two inequivalent Wyckoff positions in a crystal with a polar space group, where inversion symmetry is spontaneously broken. According to this rule, we propose the first class of potential ferroelectric-like elemental polar metals in a distorted α-La-like structure with a polar space group P63 mc in which two inequivalent Wyckoff positions 2a (0, 0, z) and 2b (1/3, 2/3, z) are occupied by group-V elements (phosphorus, arsenic, antimony, and bismuth). Analyses based on first-principles calculations indicate that the dynamically stable polar phase results from a lone pair driven polar distortion of the nonploar phase in P63/mmc symmetry where two inequivalent Wyckoff positions 2a (0, 0, 0) and 2c (1/3, 2/3, 1/4) are occupied. This ferroelectric-like transition involves a transition from a metallic state to a semimetallic state. These predicted polar phases are metastable with respect to their corresponding ground phases. Moreover, ionic bonding characters are found due to the inequivalence in Wyckoff positions between group-V atoms. Our work opens a route to single-element parity-breaking phases.
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Affiliation(s)
- Hu Zhang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China. Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300071, People's Republic of China
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271
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Small DW, Head-Gordon M. Independent amplitude approximations in coupled cluster valence bond theory: Incorporation of 3-electron-pair correlation and application to spin frustration in the low-lying excited states of a ferredoxin-type tetrametallic iron-sulfur cluster. J Chem Phys 2018; 149:144103. [DOI: 10.1063/1.5046318] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- David W. Small
- Department of Chemistry, University of California, Berkeley, California 94720, USA and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Martin Head-Gordon
- Department of Chemistry, University of California, Berkeley, California 94720, USA and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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272
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Arismendi-Arrieta DJ, Valdés Á, Prosmiti R. A Systematic Protocol for Benchmarking Guest-Host Interactions by First-Principles Computations: Capturing CO 2 in Clathrate Hydrates. Chemistry 2018; 24:9353-9363. [PMID: 29600599 DOI: 10.1002/chem.201800497] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Indexed: 01/19/2023]
Abstract
Clathrate hydrates of CO2 have been proposed as potential molecular materials in tackling important environmental problems related to greenhouse gases capture and storage. Despite the increasing interest in such hydrates and their technological applications, a molecular-level understanding of their formation and properties is still far from complete. Modeling interactions is a challenging and computationally demanding task, essential to reliably determine molecular properties. First-principles calculations for the CO2 guest in all sI, sII, and sH clathrate cages were performed, and the nature of the guest-host interactions, dominated by both hydrogen-bond and van der Waals forces, was systematically investigated. Different families of density functionals, as well as pairwise CO2 @H2 O model potentials versus wavefunction-based quantum approaches were studied for CO2 clathrate-like systems. Benchmark energies for new distance-dependent datasets, consisting of potential energy curves sampling representative configurations of the systems at the repulsive, near-equilibrium, and asymptotic/long-range regions of the full-dimensional surface, were generated, and a general protocol was proposed to assess the accuracy of such conventional and modern approaches at minimum and non-minimum orientations. Our results show that dispersion interactions are important in the guest-host stabilization energies of such clathrate cages, and the encapsulation of the CO2 into guest-free clathrate cages is always energetically favorable. In addition, the orientation of CO2 inside each cage was explored, and the ability of current promising approaches to accurately describe non-covalent CO2 @H2 O guest-host interactions in sI, sII, and sH clathrates was discussed, providing information for their applicability to future multiscale computer simulations.
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Affiliation(s)
| | - Álvaro Valdés
- Departamento de Física, Universidad Nacional de Colombia, Calle 26, Cra 39, Edificio, 404, Bogotá, Colombia
| | - Rita Prosmiti
- Institute of Fundamental Physics (IFF-CSIC), CSIC, Serrano 123, 28006, Madrid, Spain
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273
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Affiliation(s)
- Richard C. Remsing
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, Philadelphia, PA, USA
| | - Jianwei Sun
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA, USA
| | - Umesh V. Waghmare
- Jawaharlal Nehru Center for Advanced Scientific Research, Bangalore, India
| | - Michael L. Klein
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, Philadelphia, PA, USA
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274
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Watanabe Y. Calculation of strained BaTiO3 with different exchange correlation functionals examined with criterion by Ginzburg-Landau theory, uncovering expressions by crystallographic parameters. J Chem Phys 2018; 148:194702. [DOI: 10.1063/1.5022319] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yukio Watanabe
- Department of Physics, Kyushu University, Fukuoka 819-0395, Japan
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275
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Interplay between test sets and statistical procedures in ranking DFT methods: The case of electron density studies. MENDELEEV COMMUNICATIONS 2018. [DOI: 10.1016/j.mencom.2018.05.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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276
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Zheng L, Chen M, Sun Z, Ko HY, Santra B, Dhuvad P, Wu X. Structural, electronic, and dynamical properties of liquid water by ab initio molecular dynamics based on SCAN functional within the canonical ensemble. J Chem Phys 2018; 148:164505. [DOI: 10.1063/1.5023611] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Lixin Zheng
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - Mohan Chen
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - Zhaoru Sun
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - Hsin-Yu Ko
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Biswajit Santra
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Pratikkumar Dhuvad
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - Xifan Wu
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
- Institute for Computational Molecular Science, Temple University, Philadelphia, Pennsylvania 19122, USA
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277
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278
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Mezei PD, Csonka GI, Kállay M. Simple Modifications of the SCAN Meta-Generalized Gradient Approximation Functional. J Chem Theory Comput 2018; 14:2469-2479. [PMID: 29565589 DOI: 10.1021/acs.jctc.8b00072] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We analyzed various possibilities to improve upon the SCAN meta-generalized gradient approximation density functional obeying all known properties of the exact functional that can be satisfied at this level of approximation. We examined the necessity of locally satisfying a strongly tightened lower bound for the exchange energy density in single-orbital regions, the nature of the error cancellation between the exchange and correlation parts in two-electron regions, and the effect of the fourth-order term in the gradient expansion of the correlation energy density. We have concluded that the functional can be modified to separately reproduce the exchange and correlation energies of the helium atom by locally releasing the strongly tightened lower bound for the exchange energy density in single-orbital regions, but this leads to an unbalanced improvement in the single-orbital electron densities. Therefore, we decided to keep the FX ≤ 1.174 exact condition for any single-orbital density, where FX is the exchange enhancement factor. However, we observed a general improvement in the single-orbital electron densities by revising the correlation functional form to follow the second-order gradient expansion in a wider range. Our new revSCAN functional provides more-accurate atomization energies for the systems with multireference character, compared to the SCAN functional. The nonlocal VV10 dispersion-corrected revSCAN functional yields more-accurate noncovalent interaction energies than the VV10-corrected SCAN functional. Furthermore, its global hybrid version with 25% of exact exchange, called revSCAN0, generally performs better than the similar SCAN0 for reaction barrier heights. Here, we also analyzed the possibility of the construction of a local hybrid from the SCAN exchange and a specific locally bounded nonconventional exact exchange energy density. We predict compatibility problems since this nonconventional exact exchange energy density does not really obey the strongly tightened lower bound for the exchange energy density in single-orbital regions.
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Affiliation(s)
- Pál D Mezei
- MTA-BME Lendület Quantum Chemistry Research Group, Department of Physical Chemistry and Materials Science , Budapest University of Technology and Economics , H-1521 Budapest , Hungary
| | - Gábor I Csonka
- Department of Inorganic and Analytical Chemistry , Budapest University of Technology and Economics , H-1521 Budapest , Hungary
| | - Mihály Kállay
- MTA-BME Lendület Quantum Chemistry Research Group, Department of Physical Chemistry and Materials Science , Budapest University of Technology and Economics , H-1521 Budapest , Hungary
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279
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Liu DJ, Thiel PA. Oxygen and sulfur adsorption on vicinal surfaces of copper and silver: Preferred adsorption sites. J Chem Phys 2018; 148:124706. [DOI: 10.1063/1.5021091] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Affiliation(s)
- Da-Jiang Liu
- Ames Laboratory of the USDOE, Ames, Iowa 50011, USA
| | - Patricia A. Thiel
- Ames Laboratory of the USDOE, Ames, Iowa 50011, USA
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA
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280
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Patra A, Jana S, Samal P. A Parameter-Free Semilocal Exchange Energy Functional for Two-Dimensional Quantum Systems. J Phys Chem A 2018; 122:3455-3461. [DOI: 10.1021/acs.jpca.8b00429] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abhilash Patra
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
| | - Subrata Jana
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
| | - Prasanjit Samal
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
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281
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CONTRERAS-GARCÍA J, YANG W. Perspective: Chemical Information Encoded in Electron Density. ACTA PHYS-CHIM SIN 2018; 34:567-580. [PMID: 31080323 PMCID: PMC6510500 DOI: 10.3866/pku.whxb201801261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this perspective, we review the chemical information encoded in electron density and other ingredients used in semilocal functionals. This information is usually looked at from the functional point of view: the exchange density or the enhancement factor are discussed in terms of the reduced density gradient. However, what parts of a molecule do these 3D functions represent? We look at these quantities in real space, aiming to understand the electronic structure information they encode and provide an insight from the quantum chemical topology (QCT). Generalized gradient approximations (GGAs) provide information about the presence of chemical interactions, whereas meta-GGAs can differentiate between the different bonding types. By merging these two techniques, we show new insight into the failures of semilocal functionals owing to three main errors: fractional charges, fractional spins, and non-covalent interactions. We build on simple models. We also analyze the delocalization error in hydrogen chains, showing the ability of QCT to reveal the delocalization error introduced by semilocal functionals. Then, we show how the analysis of localization can help understand the fractional spin error in alkali atoms, and how it can be used to correct it. Finally, we show that the poor description of GGAs of isodesmic reactions in alkanes is due to 1,3-interactions.
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Affiliation(s)
- Julia CONTRERAS-GARCÍA
- UPMC Univ Paris 06, CNRS, UMR 7616, Laboratoire de Chimie Théorique, case courrier 137, 4 place Jussieu, F-75005, Paris, France
| | - Weitao YANG
- Department of Chemistry, Duke University, Durham, NC 27708, USA
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282
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Kim DS, Hellman O, Herriman J, Smith HL, Lin JYY, Shulumba N, Niedziela JL, Li CW, Abernathy DL, Fultz B. Nuclear quantum effect with pure anharmonicity and the anomalous thermal expansion of silicon. Proc Natl Acad Sci U S A 2018; 115:1992-1997. [PMID: 29440490 PMCID: PMC5834665 DOI: 10.1073/pnas.1707745115] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Despite the widespread use of silicon in modern technology, its peculiar thermal expansion is not well understood. Adapting harmonic phonons to the specific volume at temperature, the quasiharmonic approximation, has become accepted for simulating the thermal expansion, but has given ambiguous interpretations for microscopic mechanisms. To test atomistic mechanisms, we performed inelastic neutron scattering experiments from 100 K to 1,500 K on a single crystal of silicon to measure the changes in phonon frequencies. Our state-of-the-art ab initio calculations, which fully account for phonon anharmonicity and nuclear quantum effects, reproduced the measured shifts of individual phonons with temperature, whereas quasiharmonic shifts were mostly of the wrong sign. Surprisingly, the accepted quasiharmonic model was found to predict the thermal expansion owing to a large cancellation of contributions from individual phonons.
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Affiliation(s)
- D S Kim
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125;
| | - O Hellman
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125
| | - J Herriman
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125
| | - H L Smith
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125
| | - J Y Y Lin
- Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
| | - N Shulumba
- Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA 91125
| | - J L Niedziela
- Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
| | - C W Li
- Department of Mechanical Engineering, University of California, Riverside, CA 92521
| | - D L Abernathy
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
| | - B Fultz
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125;
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283
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Kageyama H, Hayashi K, Maeda K, Attfield JP, Hiroi Z, Rondinelli JM, Poeppelmeier KR. Expanding frontiers in materials chemistry and physics with multiple anions. Nat Commun 2018; 9:772. [PMID: 29472526 PMCID: PMC5823932 DOI: 10.1038/s41467-018-02838-4] [Citation(s) in RCA: 333] [Impact Index Per Article: 55.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 01/02/2018] [Indexed: 11/29/2022] Open
Abstract
During the last century, inorganic oxide compounds laid foundations for materials synthesis, characterization, and technology translation by adding new functions into devices previously dominated by main-group element semiconductor compounds. Today, compounds with multiple anions beyond the single-oxide ion, such as oxyhalides and oxyhydrides, offer a new materials platform from which superior functionality may arise. Here we review the recent progress, status, and future prospects and challenges facing the development and deployment of mixed-anion compounds, focusing mainly on oxide-derived materials. We devote attention to the crucial roles that multiple anions play during synthesis, characterization, and in the physical properties of these materials. We discuss the opportunities enabled by recent advances in synthetic approaches for design of both local and overall structure, state-of-the-art characterization techniques to distinguish unique structural and chemical states, and chemical/physical properties emerging from the synergy of multiple anions for catalysis, energy conversion, and electronic materials.
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Affiliation(s)
- Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8581, Japan.
| | - Katsuro Hayashi
- Department of Applied Chemistry, Kyushu University, Fukuoka, 819-0395, Japan
| | - Kazuhiko Maeda
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - J Paul Attfield
- Centre for Science at Extreme Conditions, University of Edinburgh, EH9 3FD, Edinburgh, UK
| | - Zenji Hiroi
- Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba, 277-8581, Japan
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
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284
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Tao J, Perdew JP, Tang H, Shahi C. Origin of the size-dependence of the equilibrium van der Waals binding between nanostructures. J Chem Phys 2018; 148:074110. [PMID: 29471641 DOI: 10.1063/1.5018572] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Nanostructures can be bound together at equilibrium by the van der Waals (vdW) effect, a small but ubiquitous many-body attraction that presents challenges to density functional theory. How does the binding energy depend upon the size or number of atoms in one of a pair of identical nanostructures? To answer this question, we treat each nanostructure as a whole object, not as a collection of atoms. Our calculations start from an accurate static dipole polarizability for each considered nanostructure, and an accurate equilibrium center-to-center distance for the pair (the latter from experiment or from the vdW-DF-cx functional). We consider the competition in each term -C2k/d2k (k = 3, 4, 5) of the long-range vdW series for the interaction energy, between the size dependence of the vdW coefficient C2k and that of the 2kth power of the center-to-center distance d. The damping of these vdW terms can be negligible, but in any case, it does not affect the size dependence for a given term in the absence of non-vdW binding. To our surprise, the vdW energy can be size-independent for quasi-spherical nanoclusters bound to one another by vdW interaction, even with strong nonadditivity of the vdW coefficient, as demonstrated for fullerenes. We also show that, for low-dimensional systems, the vdW interaction yields the strongest size-dependence, in stark contrast to that of fullerenes. We illustrate this with parallel planar polycyclic aromatic hydrocarbons. The size dependences of other morphologies or bonding types lie between, as shown by sodium clusters.
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Affiliation(s)
- Jianmin Tao
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122-1801, USA
| | - John P Perdew
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122-1801, USA
| | - Hong Tang
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122-1801, USA
| | - Chandra Shahi
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122-1801, USA
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285
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Hermann J, Tkatchenko A. Electronic Exchange and Correlation in van der Waals Systems: Balancing Semilocal and Nonlocal Energy Contributions. J Chem Theory Comput 2018; 14:1361-1369. [DOI: 10.1021/acs.jctc.7b01172] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jan Hermann
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
- Physics and Materials Science Research Unit, University of Luxembourg, 162A Avenue de la Faïencerie, L-1511 Luxembourg
| | - Alexandre Tkatchenko
- Physics and Materials Science Research Unit, University of Luxembourg, 162A Avenue de la Faïencerie, L-1511 Luxembourg
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286
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León-Merino I, Rodríguez-Segundo R, Arismendi-Arrieta DJ, Prosmiti R. Assessing Intermolecular Interactions in Guest-Free Clathrate Hydrate Systems. J Phys Chem A 2018; 122:1479-1487. [PMID: 29328645 DOI: 10.1021/acs.jpca.7b12107] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Recently, empty hydrate structures sI, sII, sH, and others have been proposed as low-density ice structures by both experimental observations and computer simulations. Some of them have been synthesized in the laboratory, which motivates further investigations on the stability of such guest-free clathrate structures. Using semiempirical and ab initio-based water models, as well as dispersion-corrected density functional theory approaches, we predict their stability, including cooperative many-body effects, in comparison with reference data from converged wave function-based DF-MP2 electronic structure calculations. We show that large basis sets and counterpoise corrections are required to improve convergence in the interaction/binding energies for such systems. Therefore, extrapolation schemes based on triple/quadruple and quadruple/quintuple ζ quality basis sets are used to reach high accuracy. Eleven different water structures corresponding to dodecahedron, edge sharing, face sharing, and fused cubes, as a part of the WATER27 database, as well as cavities from the sI, sII, and sH clathrate hydrates formed by 20, 24, 28, and 36 water molecules, are employed, and new benchmark energies are reported. Using these benchmark sets of interaction energies, we assess the performance of both analytical models and direct DFT calculations for such clathrate-like systems. In particular, seven popular water models (TIP4P/ice, TIP4P/2005, q-TIP4P/F, TTM2-F, TTM3-F, TTM4-F, and MB-pol) available in the literature, and nine density functional approximations (3 meta-GGAs, 3 hybrids, and 3 range separated functionals) are used to investigate their accuracy. By including dispersion corrections, our results show that errors in the interaction energies are reduced for most of the DFT functionals. Despite the difficulties faced by current water models and DFT functionals to accurately describe the interactions in such water systems, we found some general trends that could serve to extend their applicability to larger systems.
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Affiliation(s)
- Iván León-Merino
- Institute of Fundamental Physics (IFF-CSIC), CSIC , Serrano 123, 28006 Madrid, Spain
| | | | | | - Rita Prosmiti
- Institute of Fundamental Physics (IFF-CSIC), CSIC , Serrano 123, 28006 Madrid, Spain
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287
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Abstract
Computational approaches based on the fundamental laws of quantum mechanics are now integral to almost all materials design initiatives in academia and industry. If computational materials science is genuinely going to deliver on its promises, then an electronic structure method with consistently high accuracy is urgently needed. We show that, thanks to recent algorithmic advances and the strategy developed in our manuscript, quantum Monte Carlo yields extremely accurate predictions for the lattice energies of materials at a surprisingly modest computational cost. It is thus no longer a technique that requires a world-leading computational facility to obtain meaningful results. While we focus on molecular crystals, the significance of our findings extends to all classes of materials. Computer simulation plays a central role in modern-day materials science. The utility of a given computational approach depends largely on the balance it provides between accuracy and computational cost. Molecular crystals are a class of materials of great technological importance which are challenging for even the most sophisticated ab initio electronic structure theories to accurately describe. This is partly because they are held together by a balance of weak intermolecular forces but also because the primitive cells of molecular crystals are often substantially larger than those of atomic solids. Here, we demonstrate that diffusion quantum Monte Carlo (DMC) delivers subchemical accuracy for a diverse set of molecular crystals at a surprisingly moderate computational cost. As such, we anticipate that DMC can play an important role in understanding and predicting the properties of a large number of molecular crystals, including those built from relatively large molecules which are far beyond reach of other high-accuracy methods.
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288
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Remsing RC, Duignan TT, Baer MD, Schenter GK, Mundy CJ, Weeks JD. Water Lone Pair Delocalization in Classical and Quantum Descriptions of the Hydration of Model Ions. J Phys Chem B 2018; 122:3519-3527. [DOI: 10.1021/acs.jpcb.7b10722] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Richard C. Remsing
- Institute for Computational Molecular Science, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Timothy T. Duignan
- Chemical and Materials Science Division, Pacific Northwest National Laboratory, Richland, Washington, United States
| | - Marcel D. Baer
- Chemical and Materials Science Division, Pacific Northwest National Laboratory, Richland, Washington, United States
| | - Gregory K. Schenter
- Chemical and Materials Science Division, Pacific Northwest National Laboratory, Richland, Washington, United States
| | - Christopher J. Mundy
- Chemical and Materials Science Division, Pacific Northwest National Laboratory, Richland, Washington, United States
- Affiliate Professor, Department of Chemical Engineering, University of Washington, Seattle, Washington, United States
| | - John D. Weeks
- Institute for Physical Science and Technology and Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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289
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Yao Y, Kanai Y. Free Energy Profile of NaCl in Water: First-Principles Molecular Dynamics with SCAN and ωB97X-V Exchange–Correlation Functionals. J Chem Theory Comput 2018; 14:884-893. [DOI: 10.1021/acs.jctc.7b00846] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Yi Yao
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Yosuke Kanai
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, United States
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290
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Tang X, Hicks Z, Wang L, Ganteför G, Bowen KH, Tsyshevsky R, Sun J, Kuklja MM. Adsorption and decomposition of dimethyl methylphosphonate on size-selected (MoO3)3 clusters. Phys Chem Chem Phys 2018; 20:4840-4850. [DOI: 10.1039/c7cp08427g] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The adsorption and decomposition of dimethyl methylphosphonate (DMMP), a chemical warfare agent (CWA) simulant, on size-selected molybdenum oxide trimer clusters, i.e. (MoO3)3, was studied both experimentally and theoretically.
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Affiliation(s)
- Xin Tang
- Department of Chemistry
- Johns Hopkins University
- Baltimore
- USA
| | - Zachary Hicks
- Department of Chemistry
- Johns Hopkins University
- Baltimore
- USA
| | - Linjie Wang
- Department of Chemistry
- Johns Hopkins University
- Baltimore
- USA
| | - Gerd Ganteför
- Department of Physics
- University of Konstanz
- 78464 Konstanz
- Germany
| | - Kit H. Bowen
- Department of Chemistry
- Johns Hopkins University
- Baltimore
- USA
| | - Roman Tsyshevsky
- Department of Materials Science
- University of Maryland
- College Park
- USA
| | - Jianwei Sun
- Department of Physics
- Tulane University
- New Orleans
- USA
| | - Maija M. Kuklja
- Department of Materials Science
- University of Maryland
- College Park
- USA
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291
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Kurzydłowski D, Derzsi M, Barone P, Grzelak A, Struzhkin V, Lorenzana J, Grochala W. Dramatic enhancement of spin–spin coupling and quenching of magnetic dimensionality in compressed silver difluoride. Chem Commun (Camb) 2018; 54:10252-10255. [DOI: 10.1039/c8cc05002c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The high-pressure HP2 form of AgF2 features Ag2F73− units that are theoretically predicted to host extremely strong antiferromagnetic interactions, surpassing those seen in copper(ii) oxides.
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Affiliation(s)
- Dominik Kurzydłowski
- Center of New Technologies
- University of Warsaw
- 02-097 Warsaw
- Poland
- Faculty of Mathematics and Natural Sciences
| | - Mariana Derzsi
- Center of New Technologies
- University of Warsaw
- 02-097 Warsaw
- Poland
- Advanced Technologies Research Institute
| | | | - Adam Grzelak
- Center of New Technologies
- University of Warsaw
- 02-097 Warsaw
- Poland
- Faculty of Chemistry
| | - Viktor Struzhkin
- Geophysical Laboratory
- Carnegie Institution of Washington
- Washington
- USA
| | - José Lorenzana
- ISC-CNR
- Dipartimento di Fisica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
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292
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Fung V, Tao F(F, Jiang DE. Low-temperature activation of methane on doped single atoms: descriptor and prediction. Phys Chem Chem Phys 2018; 20:22909-22914. [DOI: 10.1039/c8cp03191f] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We predict that Pt and several other single atoms on rutile TiO2(110) can chemisorb and activate methane at low temperatures.
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Affiliation(s)
- Victor Fung
- Department of Chemistry
- University of California
- Riverside
- USA
| | - Franklin (Feng) Tao
- Department of Chemical and Petroleum Engineering and Department of Chemistry
- University of Kansas
- Lawrence
- USA
| | - De-en Jiang
- Department of Chemistry
- University of California
- Riverside
- USA
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293
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Liu Y, Ojamäe L. Clathrate ice sL: a new crystalline phase of ice with ultralow density predicted by first-principles phase diagram computations. Phys Chem Chem Phys 2018. [DOI: 10.1039/c8cp00699g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A new crystalline ice phase (clathrate ice sL) with ultralow density under negative pressure predicted by the first-principles phase diagram computations.
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Affiliation(s)
- Yuan Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
- Department of Chemistry
| | - Lars Ojamäe
- Department of Chemistry
- IFM
- Linköping University
- SE-58 183 Linköping
- Sweden
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294
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Rusinov IP, Golub P, Sklyadneva IY, Isaeva A, Menshchikova TV, Echenique PM, Chulkov EV. Chemically driven surface effects in polar intermetallic topological insulators A3Bi. Phys Chem Chem Phys 2018; 20:26372-26385. [PMID: 30303503 DOI: 10.1039/c8cp04016h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Surface electronic spectra, surface and bulk properties as well as the underlying chemical bonding characteristics in topological insulators with complex bonding patterns are considered for the example of cubic, polar intermetallics KNa2Bi, K3Bi and Rb3Bi (with the general formula A3Bi, A – alkali metal).
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Affiliation(s)
- I. P. Rusinov
- Tomsk State University
- Tomsk
- Russia
- St. Petersburg State University
- St. Petersburg
| | - P. Golub
- National University of Singapore
- 117575 Singapore
- Singapore
| | - I. Yu. Sklyadneva
- Tomsk State University
- Tomsk
- Russia
- Karlsruher Institut für Technologie
- Institut für Festkörperphysik
| | - A. Isaeva
- Technische Universität Dresden
- Dresden
- Germany
| | | | - P. M. Echenique
- Donostia International Physics Center (DIPC)
- 20018 San Sebastián/Donostia
- Spain
- Departamento de Física de Materiales
- Facultad de Ciencias Químicas
| | - E. V. Chulkov
- Tomsk State University
- Tomsk
- Russia
- St. Petersburg State University
- St. Petersburg
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295
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Bezerra KS, Lima Neto JX, Oliveira JIN, Albuquerque EL, Caetano EWS, Freire VN, Fulco UL. Computational investigation of the α2β1 integrin–collagen triple helix complex interaction. NEW J CHEM 2018. [DOI: 10.1039/c8nj04175j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, quantum biochemistry methods have been used to describe important protein–protein interactions for the complex integrin–collagen.
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Affiliation(s)
- K. S. Bezerra
- Departamento de Biofísica e Farmacologia
- Universidade Federal do Rio Grande do Norte
- Natal-RN
- Brazil
| | - J. X. Lima Neto
- Departamento de Biofísica e Farmacologia
- Universidade Federal do Rio Grande do Norte
- Natal-RN
- Brazil
| | - J. I. N. Oliveira
- Departamento de Biofísica e Farmacologia
- Universidade Federal do Rio Grande do Norte
- Natal-RN
- Brazil
| | - E. L. Albuquerque
- Departamento de Biofísica e Farmacologia
- Universidade Federal do Rio Grande do Norte
- Natal-RN
- Brazil
| | - E. W. S. Caetano
- Instituto Federal de Educação
- Ciência e Tecnologia do Ceará
- Fortaleza-CE
- Brazil
| | - V. N. Freire
- Departamento de Física
- Universidade Federal do Ceará
- Fortaleza-CE
- Brazil
| | - U. L. Fulco
- Departamento de Biofísica e Farmacologia
- Universidade Federal do Rio Grande do Norte
- Natal-RN
- Brazil
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296
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Vega L, Ruvireta J, Viñes F, Illas F. Jacob’s Ladder as Sketched by Escher: Assessing the Performance of Broadly Used Density Functionals on Transition Metal Surface Properties. J Chem Theory Comput 2017; 14:395-403. [DOI: 10.1021/acs.jctc.7b01047] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lorena Vega
- Departament de Ciència de Materials
i Química Física and Institut de Química Teòrica
i Computacional (IQTCUB), Universitat de Barcelona, c/Martí
i Franquès 1, Barcelona 08028, Spain
| | - Judit Ruvireta
- Departament de Ciència de Materials
i Química Física and Institut de Química Teòrica
i Computacional (IQTCUB), Universitat de Barcelona, c/Martí
i Franquès 1, Barcelona 08028, Spain
| | - Francesc Viñes
- Departament de Ciència de Materials
i Química Física and Institut de Química Teòrica
i Computacional (IQTCUB), Universitat de Barcelona, c/Martí
i Franquès 1, Barcelona 08028, Spain
| | - Francesc Illas
- Departament de Ciència de Materials
i Química Física and Institut de Química Teòrica
i Computacional (IQTCUB), Universitat de Barcelona, c/Martí
i Franquès 1, Barcelona 08028, Spain
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297
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Vuckovic S, Levy M, Gori-Giorgi P. Augmented potential, energy densities, and virial relations in the weak- and strong-interaction limits of DFT. J Chem Phys 2017; 147:214107. [DOI: 10.1063/1.4997311] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Stefan Vuckovic
- Department of Theoretical Chemistry and Amsterdam Center for Multiscale Modeling, FEW, Vrije Universiteit, De Boelelaan 1083, 1081HV Amsterdam, The Netherlands
| | - Mel Levy
- Department of Chemistry and Quantum Theory Group, Tulane University, New Orleans, Louisiana 70118, USA
| | - Paola Gori-Giorgi
- Department of Theoretical Chemistry and Amsterdam Center for Multiscale Modeling, FEW, Vrije Universiteit, De Boelelaan 1083, 1081HV Amsterdam, The Netherlands
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298
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Huang LF, Rondinelli JM. Electrochemical phase diagrams of Ni from ab initio simulations: role of exchange interactions on accuracy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:475501. [PMID: 28980526 DOI: 10.1088/1361-648x/aa9140] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The stabilities of Ni metal and its derived compounds, including oxides, hydroxides, and oxyhydroxides under electrochemical conditions, can be readily predicted from the Ni Pourbaix diagram, where the formation free energies of the involved species are utilized to construct the phase stability map with respect to electrode potential and pH. We calculate and analyze the crystal structures, electronic structures, and thermodynamic energies of Ni metal and its compounds using different exchange-correlation functionals to density-functional-theory (DFT), including the semilocal LDA and GGA density functionals, the nonlocal metaGGA, and the hybrid density functionals. Next, we simulate the corresponding Ni Pourbaix diagrams to compare systematically the performance of the functional to each other and to experimental observations. We show that the structures and energies obtained from experimental databases may not be sufficiently accurate to describe direct electrochemical observations, and we explain how the electronic exchange within the density functionals plays a key role in determining the accuracy of the DFT calculated electronic, thermodynamic, and electrochemical properties. We find that only the hybrid density functional produces reliable results owing to the fractional contribution of exact Fock exchange included therein. Last, based on our accurate Ni Pourbaix diagram, we construct band-gap and magnetic electrochemical maps which can facilitate more experimental measurements and property assessments under variable potential and pH in the future.
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Affiliation(s)
- Liang-Feng Huang
- Department of Materials Science & Engineering, Northwestern University, Evanston, IL 60208, United States of America
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299
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Affiliation(s)
- Rundong Zhao
- Materials and Energy Division, Beijing Computational Science Research Center, Beijing, China
| | - Rui-Qin Zhang
- Materials and Energy Division, Beijing Computational Science Research Center, Beijing, China
- Department of Physics, City University of Hong Kong, Hong Kong SAR, China
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300
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Properties of real metallic surfaces: Effects of density functional semilocality and van der Waals nonlocality. Proc Natl Acad Sci U S A 2017; 114:E9188-E9196. [PMID: 29042509 DOI: 10.1073/pnas.1713320114] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We have computed the surface energies, work functions, and interlayer surface relaxations of clean (111), (100), and (110) surfaces of Al, Cu, Ru, Rh, Pd, Ag, Pt, and Au. We interpret the surface energy from liquid metal measurements as the mean of the solid-state surface energies over these three lowest-index crystal faces. We compare experimental (and random phase approximation) reference values to those of a family of nonempirical semilocal density functionals, from the basic local density approximation (LDA) to our most advanced general purpose meta-generalized gradient approximation, strongly constrained and appropriately normed (SCAN). The closest agreement is achieved by the simplest density functional LDA, and by the most sophisticated one, SCAN+rVV10 (Vydrov-Van Voorhis 2010). The long-range van der Waals interaction, incorporated through rVV10, increases the surface energies by about 10%, and increases the work functions by about 3%. LDA works for metal surfaces through two known error cancellations. The Perdew-Burke-Ernzerhof generalized gradient approximation tends to underestimate both surface energies (by about 24%) and work functions (by about 4%), yielding the least-accurate results. The amount by which a functional underestimates these surface properties correlates with the extent to which it neglects van der Waals attraction at intermediate and long range. Qualitative arguments are given for the signs of the van der Waals contributions to the surface energy and work function. A standard expression for the work function in Kohn-Sham (KS) theory is shown to be valid in generalized KS theory. Interlayer relaxations from different functionals are in reasonable agreement with one another, and usually with experiment.
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