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Angell CA, Clarke JHR, Woodcock LV. Interaction Potentials and Glass Formation: A Survey of Computer Experiments. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470142684.ch5] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Ivanov-Shitz AK. Computer simulation of superionic conductors: I. Anionic conductors: Review. CRYSTALLOGR REP+ 2007. [DOI: 10.1134/s1063774507010154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Cheng Z, Chang J, Jia Z, Chen N. Molecular Dynamics Simulation of CaF2Structure in Crystalline, Superionic and Molten Phases. MOLECULAR SIMULATION 2006. [DOI: 10.1080/08927029308022496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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De Leeuw SW, Dixon M. Molecular dynamics studies of point and extended defects in copper. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01418618508237624] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Catlow CRA, Comins JD, Germano FA, Harley RT, Hayes W. Brillouin scattering and theoretical studies of high-temperature disorder in fluorite crystals. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/11/15/019] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Dickens MH, Hutchings MT, Kjems J, Lechner RE. Quasielastic neutron scattering by superionic strontium chloride. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/11/14/005] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Carr VM, Chadwick AV, Saghafian R. The electrical conductivity of PbF2and SrCl2crystals at high temperatures. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/11/15/006] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gillan MJ, Dixon M. Molecular dynamics simulation of fast-ion conduction in SrCl2. I. Self-diffusion. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/13/10/010] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gillan MJ, Dixon M. Quasi-elastic scattering in fast-ion conducting SrCl2: a molecular dynamics study. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/13/30/003] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hayes TM, Boyce JB. EXAFS as a probe of atom-atom interaction potentials: AgI and CuI. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/13/27/001] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Dickens MH, Hayes W, Hutchings MT, Smith C. Investigation of anion disorder in PbF2at high temperatures by neutron diffraction. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/15/19/006] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hutchings MT, Clausen K, Dickens MH, Hayes W, Kjems JK, Schnabel PG, Smith C. Investigation of thermally induced anion disorder in fluorites using neutron scattering techniques. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/17/22/011] [Citation(s) in RCA: 131] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Walker AB, Dixon M, Gillan MJ. Computer simulation of ionic disorder in high-temperature PbF2. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/15/19/007] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Impey RW, Klein ML, McDonald IR. Structure of the fast-ion conducting phase of soil lithium sulphate. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/17/22/012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Wolf ML. Observation of solitary-wave conduction in a molecular dynamics simulation of the superionic conductor Li3N. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/17/10/001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ngoepe PE, Comins JD. Brillouin scattering studies of stabilised zirconias at high temperature. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/20/20/005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Computer simulation of defect motion in model normal and ‘fast ion’ conductors II. SrCl
2. ACTA ACUST UNITED AC 1997. [DOI: 10.1098/rspa.1985.0030] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The molecular dynamics method has been applied to the simulation of the fast-ion conductor SrCl
2
. Calculations have been done at increasing temperatures from low temperatures through the normal and high-conductivity regions into the melt. Because of the periodic boundary conditions imposed and the size of the simulation sample (324 ions), the minimum defect concentration of anion Frenkel defects that can exist in the steady state is 1/216 defects per anion lattice site. At low temperatures Frenkel defects introduced into the initial configuration are eliminated, but at higher temperatures Frenkel defects form spontaneously on the anion sublattice. Anions move primarily in <1 0 0> directions by the vacancy mechanism, although more rarely <1 1 0> jumps also occur. At intermediate temperatures interstitials were observed to make non-collinear interstitialcy jumps, but at higher temperatures the motion of interstitials makes little contribution to mass transport. The vacancies appear to be very mobile and interstitials have little or no chance to move before being annihilated by a wandering vacancy. The picture is thus one of a highly dynamic system in which individual defects do not survive for long. However, it must be recognized that the rigid-ion potential used has its limitations and may overemphasize to some extent the vacancy mobility. There is so much motion on the anion sublattice at temperatures close to melting that various indicators such as the anion–anion radial distribution function, the individual ion displacements in a fixed time, and the anion self-correlation function are quite similar below and above the melting temperature. In this sense therefore, the applied description of sublattice melting does not seem to be inappropriate. However, periodic structure is still recognizable on the anion sublattice until it also disappears on the cation sublattice. The small sample molecular dynamics simulation does not predict defect clustering; this is probably because of limitations of the method and so our results are not necessarily in conflict with recent quasi-elastic neutron scattering results.
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Computer simulation of defect motion in model normal and ‘fast-ion’ conductors I. NaCl and AgCl. ACTA ACUST UNITED AC 1997. [DOI: 10.1098/rspa.1985.0029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The molecular dynamics simulation technique has been used to study Frenkel defects in crystalline NaCl and AgCl. Partial radial distribution functions, mean square displacements and the velocity autocorrelation function with its Fourier transform have been calculated for cation and anion species. Because the minimum Frenkel defect concentration that can be introduced into the molecular dynamics sample is 1/108, the initial configurations represent a non-equilibrium state and their evolution in time provides an opportunity to study mechanisms of defect migration that are involved in the recombination of Frenkel defects. Direct interstitial jumps, collinear interstitialcy migration, and [110] vacancy jumps have all been observed. The time dependence of the mean square displacements, and particularly the ratio of the square of second moment to the fourth moment of the self-correlation function, are sensitive indicators of the occurrence of defect jumps. Plots of the individual ion displacements in various time windows reveal which ions are in motion, while the projections of the cation and anion sublattices in the simulation cell give a detailed picture of the motion of the defects.
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Abstract
The quasielastic neutron scattering from fast-ion conductors with the fluorite structure has been interpreted alternatively as being due to either clusters of defects or to the motion of defects and their associated strain field. In this paper, we examine the hypothesis that the sharp rise in ionic conductivity that occurs in fluorites near the transition temperature (
T
c
) from normal to superionic conductivity, is associated with defect clustering. By using lattice simulation techniques it is shown that a wide variety of clusters are stable in SrCl
2
, CaF
2
, SrF
2
, BaF
2
and β-PbF
2
. A cluster consisting of two vacancies, two relaxed lattice ions and three interstitials (which we shall designate 2| 2| 3) is particularly stable. It is shown that the formation of 2| 2| 3 clusters results in an increase in the concentration of vacancies and that this increase can account quantitatively for the rise in conductivity near
T
c
. Our concern is thus with the possible connection of the onset of superionic conduction with defect clustering and we do not attempt, in this paper, any interpretation of the quasielastic neutron scattering.
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Satheesan Babu C, Tembe BL. Dynamics in superionic lithium sulphate lattice: paddle wheel versus percolation mechanism. Chem Phys Lett 1992. [DOI: 10.1016/0009-2614(92)86063-n] [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]
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Evangelakis GA, Pontikis V. Fast-ion conduction in fluorite CaF2 studied by equilibrium and nonequilibrium molecular dynamics. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:3180-3187. [PMID: 9997623 DOI: 10.1103/physrevb.43.3180] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Tachibana F, Kobayashi M, Okazaki H. Residence time and density distribution of silver ions in alpha -Ag2Te by molecular-dynamics simulation. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:3360-3363. [PMID: 9992281 DOI: 10.1103/physrevb.40.3360] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kaneko Y, Ueda A. Dynamical structure factor of alpha -AgI. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:10281-10287. [PMID: 9947811 DOI: 10.1103/physrevb.39.10281] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Brass A. Molecular dynamics study of the defect behaviour in fluorite structure crystals close to the superionic transition. ACTA ACUST UNITED AC 1989. [DOI: 10.1080/01418618908209823] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Shapiro SM, Reidinger F. Neutron Scattering Studies of Superionic Conductors. PHYSICS OF SUPERIONIC CONDUCTORS 1979. [DOI: 10.1007/978-3-642-81328-3_3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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