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Cheng YT, Shan TR, Liang T, Behera RK, Phillpot SR, Sinnott SB. A charge optimized many-body (COMB) potential for titanium and titania. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:315007. [PMID: 24943265 DOI: 10.1088/0953-8984/26/31/315007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This work proposes an empirical, variable charge potential for Ti and TiO(2) systems based on the charge-optimized many-body (COMB) potential framework. The parameters of the potential function are fit to the structural and mechanical properties of the Ti hcp phase, the TiO(2) rutile phase, and the energetics of polymorphs of both Ti and TiO(2). The relative stabilities of TiO(2) rutile surfaces are predicted and compared to the results of density functional theory (DFT) and empirical potential calculations. The transferability of the developed potential is demonstrated by determining the adsorption energy of Cu clusters of various sizes on the rutile TiO(2)(1 1 0) surface using molecular dynamics simulations. The results indicate that the adsorption energy is dependent on the number of Cu-Cu bonds and Cu-O bonds formed at the Cu/TiO(2) interface. The adsorption energies of Cu clusters on the reduced and oxidized TiO(2)(1 1 0) surfaces are also investigated, and the COMB potential predicts enhanced bonding between Cu clusters and the oxidized surface, which is consistent with both experimental observations and the results of DFT calculations for other transition metals (Au and Ag) on this oxidized surface.
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Affiliation(s)
- Yu-Ting Cheng
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611-6400, USA
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Smirnova MN, Geras’kin AA, Stognii AI, Golikova OL, Bespalov AV, Trukhanov AV, Kop’eva MA, Beresnev EN, Ketsko VA. Crystallization of Mg(Fe0.8Ga0.2)2O4-δ films on silicon with SiO2 and TiO2 buffer layers. RUSS J INORG CHEM+ 2014. [DOI: 10.1134/s0036023614070213] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Weidner DJ, Bass JD, Ringwood AE, Sinclair W. The single-crystal elastic moduli of stishovite. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb087ib06p04740] [Citation(s) in RCA: 223] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Anderson OL, Demarest HH. Elastic constants of the central force model for cubic structures: Polycrystalline aggregates and instabilities. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb076i005p01349] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Chang E, Graham EK. The elastic constants of cassiterite SnO2and their pressure and temperature dependence. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb080i017p02595] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Christensen NI. Compressional wave velocities in possible mantle rocks to pressures of 30 kilobars. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb079i002p00407] [Citation(s) in RCA: 177] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Liu LG, Bassett WA, Takahashi T. Effect of pressure on the lattice parameters of stishovite. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb079i008p01160] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Anderson OL. The determination of the volume dependence of the Grüneisen Parameter γ. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb079i008p01153] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Sammis C, Anderson D, Jordan T. Application of isotropic finite strain theory to ultrasonic and seismological data. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb075i023p04478] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Anderson OL. Evidence supporting the approximation γρ = const for the Grüneisen parameter of the Earth's lower mantle. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb084ib07p03537] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Anderson DL, Anderson OL. Brief report: The bulk modulus-volume relationship for oxides. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb075i017p03494] [Citation(s) in RCA: 233] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mizutani H, Hamano Y, Akimoto SI. Elastic-wave velocities of polycrystalline stishovite. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb077i020p03744] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Shankland TJ. Velocity-density systematics: Derivation from Debye theory and the effect of ionic size. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb077i020p03750] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kumazawa M, Anderson OL. Elastic moduli, pressure derivatives, and temperature derivatives of single-crystal olivine and single-crystal forsterite. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb074i025p05961] [Citation(s) in RCA: 601] [Impact Index Per Article: 50.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Legut D, Pavlů J. Electronic structure and elasticity of Z-phases in the Cr-Nb-V-N system. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:195502. [PMID: 22510439 DOI: 10.1088/0953-8984/24/19/195502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Structural properties and energetics of Cr-based Z-phases (CrNbN, Cr(Nb,V)N and CrVN) were investigated using the Vienna ab initio simulation package (VASP) code employing the projector augmented wave (PAW) pseudopotentials by means of both local density approximation (LDA) and generalized gradient approximation (GGA) for the exchange and correlation term. The geometry of all studied phases including NbN, VN and elemental constituents (nonmagnetic bcc Nb and V and antiferromagnetic bcc Cr) was fully relaxed, providing the equilibrium structure parameters and total energies. The calculated lattice parameters of Z-phases correspond very well to the experimental data and decrease with increasing molar fraction of vanadium. Enthalpies of formation show that all three Z-phases are stable at T = 0 K. The electronic structures of Z-phases including densities of states and charge densities were analysed. The calculated bulk moduli and elastic constants were used to evaluate stability conditions and elastic anisotropy ratios. It was confirmed that Z-phases are mechanically stable. Additional information on ductility was obtained from Cauchy pressures, Pugh ratios, Young moduli, and Poisson ratios. The ductility evaluated using the Pugh ratio decreases with number of vanadium atoms.
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Affiliation(s)
- Dominik Legut
- Nanotechnology Centre, VSB-Technical University of Ostrava, 17. listopadu 15, Ostrava, Czech Republic.
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Wu X, Holbig E, Steinle-Neumann G. Structural stability of TiO2 at high pressure in density-functional theory based calculations. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:295501. [PMID: 21399308 DOI: 10.1088/0953-8984/22/29/295501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A new study on the pressure-induced phase transitions of TiO(2) has been performed using all-electron density-functional theory based computations with the projector augmented wave and the linearized augmented plane wave methods considering five experimentally observed structures. The static results yield a picture that is consistent with experiments, i.e., phase transitions with pressure are predicted as rutile --> monoclinic baddeleyite (MI) --> orthorhombic I (OI) --> cotunnite (OII) on compression, and OII --> OI --> MI --> columbite (TiO(2)II) on decompression. The elasticities of these five polymorphs are compared. Except for the baddeleyite structure, which is considerably softer than the other polymorphs, all phases show a zero pressure bulk modulus in the range of 200-240 GPa, consistent with compression results and the single crystal elastic constant; on the basis of these results we can say that the cotunnite phase is not a superhard TiO(2) polymorph as has been suggested previously. We further find that the rutile and columbite structures are energetically very similar, with the columbite structure favored slightly. All polymorphs are predicted as insulating with comparable band gaps (∼1.7-2.3 eV). Crystal field splitting for the Ti 3d electronic states leads to two distinct conduction bands in rutile and TiO(2)II for energies smaller than 8 eV, while there is a single conduction band for the other high pressure structures.
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Affiliation(s)
- Xiang Wu
- Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany.
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Mo SD, Ching WY. Electronic and optical properties of three phases of titanium dioxide: Rutile, anatase, and brookite. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:13023-13032. [PMID: 9978097 DOI: 10.1103/physrevb.51.13023] [Citation(s) in RCA: 261] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim HK, You H, Chiarello RP, Chang HL, Zhang TJ, Lam DJ. Finite-size effect on the first-order metal-insulator transition in VO2 films grown by metal-organic chemical-vapor deposition. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:12900-12907. [PMID: 10005487 DOI: 10.1103/physrevb.47.12900] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Glassford KM, Chelikowsky JR. Structural and electronic properties of titanium dioxide. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:1284-1298. [PMID: 10003766 DOI: 10.1103/physrevb.46.1284] [Citation(s) in RCA: 96] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Keskar NR, Chelikowsky JR. Structural properties of nine silica polymorphs. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:1-13. [PMID: 10002176 DOI: 10.1103/physrevb.46.1] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Keskar NR, Troullier N, Martins JL, Chelikowsky JR. Structural properties of SiO2 in the stishovite structure. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:4081-4088. [PMID: 10000052 DOI: 10.1103/physrevb.44.4081] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hofmeister AM. Calculation of bulk modulus and its pressure derivatives from vibrational frequencies and mode Grüneisen Parameters: Solids with cubic symmetry or one nearest-neighbor distance. ACTA ACUST UNITED AC 1991. [DOI: 10.1029/91jb01381] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hemley RJ. Pressure dependence of Raman spectra of SiO2 polymorphs: α-quartz, coesite, and stishovite. HIGH‐PRESSURE RESEARCH IN MINERAL PHYSICS: A VOLUME IN HONOR OF SYUN‐ITI AKIMOTO 1987. [DOI: 10.1029/gm039p0347] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Shock-induced phase transitions in rutile single crystal. ACTA ACUST UNITED AC 1987. [DOI: 10.1029/gm039p0385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Yang H, Sladek RJ, Harrison HR. Pressure dependence of elastic constants of (V1-xCrx)2O3 at 296 K. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 31:5417-5422. [PMID: 9936508 DOI: 10.1103/physrevb.31.5417] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ming LC, Manghnani MH. Isothermal compression of TiO2(Rutile) under hydrostatic pressure to 106 kbar. ACTA ACUST UNITED AC 1979. [DOI: 10.1029/jb084ib09p04777] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Manghnani MH, Brower WS, Parker HS. Anomalous elastic behavior in Cu2O under pressure. ACTA ACUST UNITED AC 1974. [DOI: 10.1002/pssa.2210250103] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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