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Fijan D, Wilson M. Thermodynamic anomalies, polyamorphism and all that. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2023; 381:20220336. [PMID: 37634531 PMCID: PMC10460645 DOI: 10.1098/rsta.2022.0336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 05/18/2023] [Indexed: 08/29/2023]
Abstract
The appearance and evolution of thermodynamics anomalies, and related properties, are studied for two classes of system, modelling those dominated by covalent and ionic interactions, respectively. Such anomalies are most familiar in the density but are also present in other thermodynamics variables such as the compressibility and heat capacity. By systematically varying key model parameters the emergence and evolution of these anomalies can be tracked across the phase space. The interaction of the anomalies can often be rationalized by thermodynamics 'rules'. The emergence of these anomalies may also be correlated with the appearance of polyamorphism, the existence of multiple amorphous states which differ in density and entropy. This article is part of the theme issue 'Exploring the length scales, timescales and chemistry of challenging materials (Part 1)'.
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Affiliation(s)
- Domagoj Fijan
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, UK
| | - Mark Wilson
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, UK
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Zeidler A, Salmon PS, Usuki T, Kohara S, Fischer HE, Wilson M. Structure of molten NaCl and the decay of the pair-correlations. J Chem Phys 2022; 157:094504. [PMID: 36075708 DOI: 10.1063/5.0107620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The structure of molten NaCl is investigated by combining neutron and x-ray diffraction with molecular dynamics simulations that employed interaction potentials with either rigid or polarizable ions. Special attention is paid to the asymptotic decay of the pair-correlation functions, which is related to the small-k behavior of the partial structure factors, where k denotes the magnitude of the scattering vector. The rigid-ion approach gives access to an effective restricted primitive model in which the anion and cation have equal but opposite charges and are otherwise identical. For this model, the decay of the pair-correlation functions is in qualitative agreement with simple theory. The polarizable ion approach gives a good account of the diffraction results and yields thermodynamic parameters (density, isothermal compressibility, Debye screening length, and heat capacity) in accord with experiment. The longest decay length for the partial pair-distribution functions is a factor of ≃2.5 times greater than the nearest-neighbor distance. The results are commensurate with the decay lengths found for the effective restricted primitive model, which are much shorter than those found in experiments on concentrated electrolytes or ionic liquids using surface force apparatus.
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Affiliation(s)
- Anita Zeidler
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | - Philip S Salmon
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | - Takeshi Usuki
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Koshirakawa, Yamagata 990-8560, Japan
| | - Shinji Kohara
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science (NIMS), Ibaraki 305-0047, Japan
| | - Henry E Fischer
- Institut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Mark Wilson
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
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Porter T, Vaka MM, Steenblik P, Della Corte D. Computational methods to simulate molten salt thermophysical properties. Commun Chem 2022; 5:69. [PMID: 36697757 PMCID: PMC9814384 DOI: 10.1038/s42004-022-00684-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 05/11/2022] [Indexed: 01/28/2023] Open
Abstract
Molten salts are important thermal conductors used in molten salt reactors and solar applications. To use molten salts safely, accurate knowledge of their thermophysical properties is necessary. However, it is experimentally challenging to measure these properties and a comprehensive evaluation of the full chemical space is unfeasible. Computational methods provide an alternative route to access these properties. Here, we summarize the developments in methods over the last 70 years and cluster them into three relevant eras. We review the main advances and limitations of each era and conclude with an optimistic perspective for the next decade, which will likely be dominated by emerging machine learning techniques. This article is aimed to help researchers in peripheral scientific domains understand the current challenges of molten salt simulation and identify opportunities to contribute.
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Affiliation(s)
- Talmage Porter
- grid.253294.b0000 0004 1936 9115Department of Physics and Astronomy, Brigham Young University, Provo, UT USA
| | - Michael M. Vaka
- grid.253294.b0000 0004 1936 9115Department of Physics and Astronomy, Brigham Young University, Provo, UT USA
| | - Parker Steenblik
- grid.253294.b0000 0004 1936 9115Department of Physics and Astronomy, Brigham Young University, Provo, UT USA
| | - Dennis Della Corte
- grid.253294.b0000 0004 1936 9115Department of Physics and Astronomy, Brigham Young University, Provo, UT USA
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Goloviznina K, Gong Z, Padua AAH. The
CL
&Pol polarizable force field for the simulation of ionic liquids and eutectic solvents. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2021. [DOI: 10.1002/wcms.1572] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
| | - Zheng Gong
- Laboratoire de Chimie École Normale Supérieure de Lyon & CNRS Lyon France
| | - Agilio A. H. Padua
- Laboratoire de Chimie École Normale Supérieure de Lyon & CNRS Lyon France
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Ocádiz-Flores J, Gheribi A, Vlieland J, Dardenne K, Rothe J, Konings R, Smith A. New insights and coupled modelling of the structural and thermodynamic properties of the LiF-UF4 system. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115820] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ocádiz-Flores JA, Gheribi AE, Vlieland J, de Haas D, Dardenne K, Rothe J, Konings RJM, Smith AL. Examination of the short-range structure of molten salts: ThF 4, UF 4, and related alkali actinide fluoride systems. Phys Chem Chem Phys 2021; 23:11091-11103. [PMID: 33949518 DOI: 10.1039/d1cp00566a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The short-range structures of LiF-ThF4, NaF-AnF4, KF-AnF4, and Cs-AnF4 (An = Th, U), were probed using in situ high temperature Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. Signally, the EXAFS spectra of pure molten ThF4 and UF4 were measured for the first time. The data were interpreted with the aid of Molecular Dynamics (MD) and standard fitting of the EXAFS equation. As in related studies, a speciation distribution dominated by [AnFx]4-x (x = 7, 8, 9) coordination complexes was observed. The average coordination number was found to decrease with the increasing size of the alkali cation, and increase with AnF4 content. An average coordination number close to 6, which had not been detected before in melts of alkali actinide fluorides, was seen when CsF was used as solvent.
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Affiliation(s)
- J A Ocádiz-Flores
- Delft University of Technology, Faculty of Applied Sciences, Radiation Science & Technology Department, Mekelweg 15, 2629 JB Delft, The Netherlands
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Goloviznina K, Gong Z, Costa Gomes MF, Pádua AAH. Extension of the CL&Pol Polarizable Force Field to Electrolytes, Protic Ionic Liquids, and Deep Eutectic Solvents. J Chem Theory Comput 2021; 17:1606-1617. [PMID: 33555860 DOI: 10.1021/acs.jctc.0c01002] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The polarizable CL&Pol force field presented in our previous study, Transferable, Polarizable Force Field for Ionic Liquids (J. Chem. Theory Comput. 2019, 15, 5858, DOI: http://doi.org/10.1021/acs.jctc.9b0068910.1021/acs.jctc.9b00689), is extended to electrolytes, protic ionic liquids (PIL), deep eutectic solvents (DES), and glycols. These systems are problematic in polarizable simulations because they contain either small, highly charged ions or strong hydrogen bonds, which cause trajectory instabilities due to the pull exerted on the induced dipoles. We use a Tang-Toennies (TT) function to dampen, or smear, the interactions between charges and induced dipole at a short range involving small, highly charged atoms (such as hydrogen or lithium), thus preventing the "polarization catastrophe". The new force field gives stable trajectories and is validated through comparison with experimental data on density, viscosity, and ion diffusion coefficients of liquid systems of the above-mentioned classes. The results also shed light on the hydrogen-bonding pattern in ethylammonium nitrate, a PIL, for which the literature contains conflicting views. We describe the implementation of the TT damping function, of the temperature-grouped Nosé-Hoover thermostat for polarizable molecular dynamics (MD) and of the periodic perturbation method for viscosity evaluation from non-equilibrium trajectories in the LAMMPS MD code. The main result of this work is the wider applicability of the CL&Pol polarizable force field to new, important classes of fluids, achieving robust trajectories and a good description of equilibrium and transport properties in challenging systems. The fragment-based approach of CL&Pol will allow ready extension to a wide variety of PILs, DES, and electrolytes.
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Affiliation(s)
- Kateryna Goloviznina
- Laboratoire de Chimie, École Normale Supérieure de Lyon & CNRS, 69364 Lyon, France
| | - Zheng Gong
- Laboratoire de Chimie, École Normale Supérieure de Lyon & CNRS, 69364 Lyon, France
| | | | - Agílio A H Pádua
- Laboratoire de Chimie, École Normale Supérieure de Lyon & CNRS, 69364 Lyon, France
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Serva A, Guerault A, Ishii Y, Gouillart E, Burov E, Salanne M. Structural and dynamic properties of soda–lime–silica in the liquid phase. J Chem Phys 2020; 153:214505. [DOI: 10.1063/5.0029702] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Alessandra Serva
- Sorbonne Université, CNRS, Physico-Chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France
| | - Allan Guerault
- Sorbonne Université, CNRS, Physico-Chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France
- Surface du Verre et Interface (UMR 125), CNRS/Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
| | - Yoshiki Ishii
- Graduate School of Simulation Studies, University of Hyogo, 7-1-28 Minatojima-Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Emmanuelle Gouillart
- Surface du Verre et Interface (UMR 125), CNRS/Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
| | - Ekaterina Burov
- Surface du Verre et Interface (UMR 125), CNRS/Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
| | - Mathieu Salanne
- Sorbonne Université, CNRS, Physico-Chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France
- Institut Universitaire de France (IUF), 75231 Paris Cedex 05, France
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Fijan D, Wilson M. The progression of thermodynamic anomalies in MX 2 networks with local tetrahedral geometries. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:275102. [PMID: 32149726 DOI: 10.1088/1361-648x/ab7d63] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Key thermodynamic anomalies in density and compressibility, as well as the related stability limits, are determined using an ionic model for BeF2 which includes many-body polarization terms. BeF2 is chosen as an example of an archetypal network-forming system whose structure can be rationalised in terms of connected local tetrahedral coordination polyhedra. The anion dipole polarizability (which effectively controls the bond angles linking neighbouring tetrahedra) is used as a single free parameter in order to help rationalise the changes in the anomaly locations in phase space, whilst all other potential parameters remain fixed. The anomalies and stability limits systematically shift to lower temperature and higher pressure as the anion polarizability is increased. At high dipole polarizabilities the temperature of maximum density anomaly locus becomes suppressed into the supercooled regime of the phase space. The movements of the anomaly loci are analysed in terms of the network structure and the correlation with the inter-tetrahedral bond angles is considered. The high sensitivity of the anomalies to the details of the potential models applied is discussed with reference to previous works on related systems. The relationship to analogous studies on Stillinger-Weber liquids is discussed.
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Coy SL, Grimes DD, Zhou Y, Field RW, Wong BM. Electric potential invariants and ions-in-molecules effective potentials for molecular Rydberg states. J Chem Phys 2016; 145:234301. [DOI: 10.1063/1.4968228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Stephen L. Coy
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachussetts 02139, USA
| | - David D. Grimes
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachussetts 02139, USA
| | - Yan Zhou
- JILA, University of Colorado Boulder, 440 University Ave., Boulder, Colorado 80302, USA
| | - Robert W. Field
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachussetts 02139, USA
| | - Bryan M. Wong
- Department of Chemical and Environmental Engineering and Materials Science & Engineering Program, University of California, Riverside, California 92521, USA
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11
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Wilson M. Structure and dynamics in network-forming materials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:503001. [PMID: 27779129 DOI: 10.1088/0953-8984/28/50/503001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The study of the structure and dynamics of network-forming materials is reviewed. Experimental techniques used to extract key structural information are briefly considered. Strategies for building simulation models, based on both targeting key (experimentally-accessible) materials and on systematically controlling key model parameters, are discussed. As an example of the first class of materials, a key target system, SiO2, is used to highlight how the changing structure with applied pressure can be effectively modelled (in three dimensions) and used to link to both experimental results and simple structural models. As an example of the second class the topology of networks of tetrahedra in the MX2 stoichiometry are controlled using a single model parameter linked to the M-X-M bond angles. The evolution of ordering on multiple length-scales is observed as are the links between the static structure and key dynamical properties. The isomorphous relationship between the structures of amorphous Si and SiO2 is discussed as are the similarities and differences in the phase diagrams, the latter linked to potential polyamorphic and 'anomalous' (e.g. density maxima) behaviour. Links to both two-dimensional structures for C, Si and Ge and near-two-dimensional bilayers of SiO2 are discussed. Emerging low-dimensional structures in low temperature molten carbonates are also uncovered.
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Affiliation(s)
- Mark Wilson
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
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Holka F, Urban M, Neogrády P, Paldus J. CCSD(T) calculations of confined systems: in-crystal polarizabilities of F⁻, Cl⁻, O²⁻, and S²⁻. J Chem Phys 2015; 141:214303. [PMID: 25481140 DOI: 10.1063/1.4902353] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We explore dipole polarizabilities of the singly and doubly charged anions F(-), Cl(-), O(2-), and S(2-) in an external, harmonic oscillator (HO) confining potential ∑(i)½ω(2)r(i)(2). We find that in contrast to F(-) and Cl(-) those for O(2-) and S(2-) are unrealistically high due to the instability of the corresponding restricted Hartree-Fock (RHF) solutions. Yet, already a relatively weak HO confining potential stabilizes their RHF solutions and eliminates any possible broken-symmetry solutions. The coupled-cluster theory with single, double and noniterative triple excitations (CCSD(T)) then yields considerably reduced polarizabilities for O(2-) and S(2-) relative to their unconfined values. We showed that polarizabilities of O(2-) and S(2-) are more sensitive to the strength of a confinement potential than are those for F(-) and Cl(-). This enables us to relate the confining parameter ω with the known experimental polarizabilities for selected crystals (our "training set") and to find a specific confining parameter ω for which the CCSD(T) polarizability equals the experimental in-crystal polarizability of an anion in the training set. The latter may then be used as an alternative approach for determining the in-crystal polarizabilities of anions by exploiting the fact that the characteristic ω values depend linearly on the ionic radius of a cation participating in specific crystals containing these anions. Using this method we then calculate the isotropic dipole polarizabilities for F(-), Cl(-), O(2-), and S(2-) embedded in the LiF, LiCl, NaF, NaCl, KF, KCl, ZnO, ZnS, MgO, MgS, CaO, CaS, SrO, SrS, BaO, BaS, and other crystals containing halogen, oxygen, or sulphur anions. We compare our results with those obtained via alternative models of the in-crystal anionic polarizabilities.
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Affiliation(s)
- F Holka
- Faculty of Materials Science and Technology in Trnava, Institute of Materials Science, Slovak University of Technology in Bratislava, Paulínska 16, 917 24 Trnava, Slovakia
| | - M Urban
- Faculty of Materials Science and Technology in Trnava, Institute of Materials Science, Slovak University of Technology in Bratislava, Paulínska 16, 917 24 Trnava, Slovakia
| | - P Neogrády
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina, SK-842 15 Bratislava, Slovakia
| | - J Paldus
- Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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Corradini D, Marrocchelli D, Madden PA, Salanne M. The effect of dispersion interactions on the properties of LiF in condensed phases. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:244103. [PMID: 24862988 DOI: 10.1088/0953-8984/26/24/244103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Classical molecular dynamics simulations are performed on LiF in the framework of the polarizable ion model. The overlap repulsion and polarization terms of the interaction potential are derived on a purely non-empirical, first-principles basis. For the dispersion, three cases are considered: a first one in which the dispersion parameters are set to zero and two others in which they are included, with different parametrizations. Various thermodynamic, structural and dynamic properties are calculated for the solid and liquid phases. The melting temperature is also obtained from direct coexistence simulations of the liquid and solid phases. Dispersion interactions appear to have an important effect on the densities of both phases and on the melting point, although the liquid properties are not affected when simulations are performed in the NVT ensemble at the experimental density.
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Affiliation(s)
- Dario Corradini
- Sorbonne Universités, UPMC Paris 06, UMR 8234, PHENIX, F-75005, Paris, France. CNRS, UMR 8234, PHENIX, F-75005, Paris, France
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Wilding MC, Wilson M, Benmore CJ, Weber JKR, McMillan PF. Structural changes in supercooled Al2O3–Y2O3 liquids. Phys Chem Chem Phys 2013; 15:8589-605. [DOI: 10.1039/c3cp51209f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Wilson M. The effects of topology on the structural, dynamic and mechanical properties of network-forming materials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:284114. [PMID: 22738992 DOI: 10.1088/0953-8984/24/28/284114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The effects of network topology on the static structural, mechanical and dynamic properties of MX(2) network-forming liquids (with tetrahedral short-range order) are discussed. The network topology is controlled via a single model parameter (the anion polarizability) which effectively constrains the inter-tetrahedral linkages in a physically transparent manner. Critically, it is found to control the balance between the stability of corner- and edge-sharing tetrahedra. A potential rigidity transformation is investigated. The vibrational density of states is investigated, using an instantaneous normal model analysis, as a function of both anion polarizability and temperature. A low frequency peak is seen to appear and is shown to be correlated with the fraction of cations which are linked through solely edge-sharing structural motifs. A modified effective mean atom coordination number is proposed which allows the appearance of the low frequency feature to be understood in terms of a mean field rigidity percolation threshold.
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Affiliation(s)
- Mark Wilson
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK.
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Spagnoli D, Gale JD. Atomistic theory and simulation of the morphology and structure of ionic nanoparticles. NANOSCALE 2012; 4:1051-1067. [PMID: 22139365 DOI: 10.1039/c1nr11106j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Computational techniques are widely used to explore the structure and properties of nanomaterials. This review surveys the application of both quantum mechanical and force field based atomistic simulation methods to nanoparticles, with a particular focus on the methodologies available and the ways in which they can be utilised to study structure, phase stability and morphology. The main focus of this article is on partially ionic materials, from binary semiconductors through to mineral nanoparticles, with more detailed considered of three examples, namely titania, zinc sulphide and calcium carbonate.
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Affiliation(s)
- Dino Spagnoli
- Nanochemistry Research Institute, Department of Chemistry, Curtin University, PO Box U1987, Perth, WA 6845, Australia
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GUBSKAYA AV, KUSALIK PG. The multipole polarizabilities and hyperpolarizabilities of the water molecule in liquid state: an ab initio study. Mol Phys 2009. [DOI: 10.1080/00268970110041218] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- A. V. GUBSKAYA
- a Department of Chemistry , Dalhousie University , Halifax Nova Scotia , B3H 4J3 , Canada
| | - P. G. KUSALIK
- a Department of Chemistry , Dalhousie University , Halifax Nova Scotia , B3H 4J3 , Canada
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Salanne M, Simon C, Turq P, Madden PA. Heat-transport properties of molten fluorides: Determination from first-principles. J Fluor Chem 2009. [DOI: 10.1016/j.jfluchem.2008.07.013] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wilson M. Formation of, and ion-transport in, low-dimensional crystallites in carbon nanotubes. Faraday Discuss 2007; 134:283-95; discussion 315-29, 415-9. [PMID: 17326574 DOI: 10.1039/b602488b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of low-dimensional crystal structures, obtained by filling carbon nanotubes from the molten salts, is considered for three stoichiometries (the MX, MX2 and MX3). For the MX stoichiometry, general classes of inorganic nanotube (INT) are predicted to exist whose morphology depends both on the low-energy (bulk) crystal structure and the encasing carbon nanotube diameter. These INTs are generally found to have no direct bulk analogues. For both the MX2 and MX3 stoichiometries crystal structures are predicted which either have a direct bulk analogue, or whose structure can be considered as a distortion of a bulk fragment. In both of these stoichiometries unusual (high anion coordination) crystallites are predicted. For the MX stoichiometry the ion transport mechanism is investigated and discussed, whilst for the MX3 the vibrational densities of states are analysed with respect to both the pure liquid and idealized crystallites.
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Affiliation(s)
- Mark Wilson
- Department of Chemistry, University College London, 20 Gordon Street, London, UK
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24
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Lanning OJ, Shellswell S, Madden * PA. Solid–liquid coexistence in ionic systems and the properties of the interface. Mol Phys 2004. [DOI: 10.1080/00268970410001689621] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Chaudhuri S, Chupas PJ, Wilson M, Madden P, Grey CP. Study of the Nature and Mechanism of the Rhombohedral-to-Cubic Phase Transition in α-AlF3 with Molecular Dynamics Simulations. J Phys Chem B 2004. [DOI: 10.1021/jp034533g] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Santanu Chaudhuri
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom, and Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Peter J. Chupas
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom, and Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Mark Wilson
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom, and Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Paul Madden
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom, and Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Clare P. Grey
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom, and Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom
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26
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Morgan B, Madden PA. Ion mobilities and microscopic dynamics in liquid (Li,K)Cl. J Chem Phys 2004; 120:1402-13. [PMID: 15268266 DOI: 10.1063/1.1629076] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dynamical properties of ionic melts formed from mixtures of LiCl and KCl have been studied across the full composition range in computer simulations of sufficient length to enable reliable values for such collective transport coefficients as the viscosity, conductivity, and internal mobilities to be determined reliably. Interest centers on the nontrivial concentration dependence exhibited by these transport coefficients, which agrees well with that observed experimentally, and in relating this to the strength of the association between an ion and its first coordination shell. The relationships between the various transport coefficients, such as those between the diffusion coefficient and the viscosity (Stokes-Einstein) and the conductivity (Nernst-Einstein) also exhibit composition dependences that reflect this association. The connection between the internal mobility and two measures of the coordination shell dynamics (the cage relaxation time and the self-exchange velocity) is explored; it is shown that the self-exchange velocity follows the composition and temperature dependence of the internal mobility very well. Finally, it is shown that allowing for anion polarization in the interaction model increases the mobility of all species without changing the structure of the melt discernibly, with the largest effect being found for the Li(+) ion.
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Affiliation(s)
- Ben Morgan
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom
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27
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Aguado A, Madden PA. Ewald summation of electrostatic multipole interactions up to the quadrupolar level. J Chem Phys 2003. [DOI: 10.1063/1.1605941] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Wilson M. Nucleation and growth of polytypic-layered crystals from the network liquid zinc chloride. J Chem Phys 2003. [DOI: 10.1063/1.1570391] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Aguado A, Madden PA. Oxide potentials from ab initio molecular dynamics: An assessment of their transferability. J Chem Phys 2003. [DOI: 10.1063/1.1556073] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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30
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Aguado A, Bernasconi L, Madden PA. Interionic potentials from ab initio molecular dynamics: The alkaline earth oxides CaO, SrO, and BaO. J Chem Phys 2003. [DOI: 10.1063/1.1556074] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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31
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DOMENE CARMEN, FOWLER PATRICKW, WILSON MARK, MADDEN PAULA. A transferable representation of the induced multipoles in ionic crystals. Mol Phys 2002. [DOI: 10.1080/0026897021000028401] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Aguado A, Madden PA. Molecular dynamics simulations of the liquid–vapor interface of a molten salt. III. Size asymmetry effects and binary mixtures. J Chem Phys 2002. [DOI: 10.1063/1.1508773] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
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33
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34
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Calandra P, Domene C, Fowler PW, Madden PA. Nuclear Quadrupole Coupling of 17O and 33S in Ionic Solids: Invalidation of the Sternheimer Model by Short-Range Corrections. J Phys Chem B 2002. [DOI: 10.1021/jp020714r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pietro Calandra
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K., and Department of Biochemistry, Oxford University, South Parks Road, Oxford OX1 3QU U.K
| | - Carmen Domene
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K., and Department of Biochemistry, Oxford University, South Parks Road, Oxford OX1 3QU U.K
| | - Patrick W. Fowler
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K., and Department of Biochemistry, Oxford University, South Parks Road, Oxford OX1 3QU U.K
| | - Paul A. Madden
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K., and Department of Biochemistry, Oxford University, South Parks Road, Oxford OX1 3QU U.K
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35
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Tabacchi G, Mundy CJ, Hutter J, Parrinello M. Classical polarizable force fields parametrized from ab initio calculations. J Chem Phys 2002. [DOI: 10.1063/1.1487822] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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36
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Aguado A. Lattice Distortions Induced by As3+, Sb3+, and Bi3+ Substitutional Impurities in KCl: An Embedded Cluster Study. J Phys Chem B 2002. [DOI: 10.1021/jp020076c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrés Aguado
- Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, U.K
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37
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Putrino A, Parrinello M. Anharmonic Raman spectra in high-pressure ice from ab initio simulations. PHYSICAL REVIEW LETTERS 2002; 88:176401. [PMID: 12005769 DOI: 10.1103/physrevlett.88.176401] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2001] [Indexed: 05/23/2023]
Abstract
We calculate from ab initio molecular dynamics the Raman scattering of high-pressure ice. To this effect we apply a new method based on the Berry phase theory of polarization. Our results are in agreement with recent and difficult experiments and are compatible with a picture in which ice VII is a proton-disordered system and in ice X the hydrogen bond is symmetric.
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Affiliation(s)
- Anna Putrino
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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38
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Aguado A, Bernasconi L, Madden PA. A transferable interatomic potential for MgO from ab initio molecular dynamics. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00326-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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39
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Wilson M. The formation of low-dimensional ionic crystallites in carbon nanotubes. J Chem Phys 2002. [DOI: 10.1063/1.1434948] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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40
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Aguado A, Wilson M, Madden PA. Molecular dynamics simulations of the liquid–vapor interface of a molten salt. I. Influence of the interaction potential. J Chem Phys 2001. [DOI: 10.1063/1.1410393] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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41
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Domene C, Fowler PW, Madden PA, Xu J, Wheatley RJ, Wilson M. Short-Range Contributions to the Polarization of Cations. J Phys Chem A 2001. [DOI: 10.1021/jp004173m] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Carmen Domene
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K, and Department of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Patrick W. Fowler
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K, and Department of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Paul A. Madden
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K, and Department of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Jijun Xu
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K, and Department of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Richard J. Wheatley
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K, and Department of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Mark Wilson
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K., School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K, and Department of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
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42
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Aguado A. Anab initiostudy of the lattice distortions induced by nonisovalent Ge2+, Sn2+, and Pb2+ substitutional impurities in crystalline NaCl. J Chem Phys 2001. [DOI: 10.1063/1.1352729] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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44
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Domene C, Fowler P, Wilson M, Madden P, Wheatley R. Overlap-model and ab initio cluster calculations of ion properties in distorted environments. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(00)01389-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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45
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Kruckeberg S, Schooss D, Maier-Borst M, Parks JH. Diffraction of trapped (CsI)(n)Cs+: the appearance of bulk structure. PHYSICAL REVIEW LETTERS 2000; 85:4494-4497. [PMID: 11082579 DOI: 10.1103/physrevlett.85.4494] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2000] [Indexed: 05/23/2023]
Abstract
We report an investigation of (CsI)(n)Cs (+) cluster structures (n = 30-39) studied using the recently developed technique of trapped ion electron diffraction. Contributions to diffraction from both rock salt (NaCl) and cesium chloride lattice (CsCl) derived isomeric structures are observed at size n = 32. This size can form a closed shell rhombic dodecahedron corresponding to the CsI bulk structure. All other sizes, n not equal32, are dominated by the NaCl structure. Density functional calculations and molecular dynamic simulations identify the presence of a stable CsCl lattice derived structure isomer which is consistent with these results.
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Affiliation(s)
- S Kruckeberg
- Rowland Institute for Science, 100 Edwin H. Land Boulevard, Cambridge, Massachusetts 02142, USA
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46
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Aguado A. Ga+, In+, and Tl+ impurities in alkali halide crystals: Distortion trends. J Chem Phys 2000. [DOI: 10.1063/1.1317520] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Gray-Weale A, Madden PA, Wilson M. Induced-dipole contributions to the conductivity and dielectric response of molten ZnCl2. J Chem Phys 2000. [DOI: 10.1063/1.1310602] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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48
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Ribeiro MCC, Almeida LCJ. Validating a polarizable model for the glass-forming liquid Ca0.4K0.6(NO3)1.4 by ab initio calculations. J Chem Phys 2000. [DOI: 10.1063/1.1289147] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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49
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Aguado A, López JM. Structures and Stabilities of CaO and MgO Clusters and Cluster Ions: An Alternative Interpretation of the Experimental Mass Spectra. J Phys Chem B 2000. [DOI: 10.1021/jp001530k] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrés Aguado
- Departamento de Física Teórica, Universidad de Valladolid, Valladolid 47011, Spain
| | - José M. López
- Departamento de Física Teórica, Universidad de Valladolid, Valladolid 47011, Spain
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50
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Domene C, Fowler P, Madden P, Wilson M, Wheatley R. Overlap model and ab initio cluster calculations of polarisabilities of ions in solids. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)01167-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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