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Общее количество найденных документов : 108
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1.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Crystal nucleation and the solid–liquid interfacial free energy [Electronic resource] / V. G. Baidakov, A. O. Tipeev // Journal of Chemical Physics. - 2012. - Vol.136, №7. - P074510
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LENNARD-JONES FLUID -- CRYSTAL NUCLEATION -- METASTABLE SYSTEMS
Аннотация: We present the results of molecular dynamics simulation of crystal nucleation in a supercooled Lennard–Jones liquid. Temperature and baric dependences of the nucleation rate, the Zeldovich factor, nucleus size diffusion coefficient, the radius, and the pressure in a critical crystal nucleus are defined in computer simulation. The data obtained have been used in the framework of classical nucleation theory to calculate the effective surface energy of crystal nuclei γe. It is shown that the value of γe at T = const exceeds the value of the interfacial free energy at a flat crystal–liquid interface γ∞ and γe < γ∞ at p = const.

\\\\Expert2\\nbo\\Journal of Chemical Physics\\2012, V.136, p.074510.pdf
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2.
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   B 16

    Baidakov, V. G.
    Crystal nucleation and the solid–liquid interfacial free energy [Electronic resource] / V. G. Baidakov, A. O. Tipeev // Journal of Chemical Physics. - 2012. - Vol.136, №7. - P074510
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LENNARD-JONES FLUID -- CRYSTAL NUCLEATION -- METASTABLE SYSTEMS
Аннотация: We present the results of molecular dynamics simulation of crystal nucleation in a supercooled Lennard–Jones liquid. Temperature and baric dependences of the nucleation rate, the Zeldovich factor, nucleus size diffusion coefficient, the radius, and the pressure in a critical crystal nucleus are defined in computer simulation. The data obtained have been used in the framework of classical nucleation theory to calculate the effective surface energy of crystal nuclei γe. It is shown that the value of γe at T = const exceeds the value of the interfacial free energy at a flat crystal–liquid interface γ∞ and γe < γ∞ at p = const.

\\\\Expert2\\nbo\\Journal of Chemical Physics\\2012, V.136, p.074510.pdf
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3.
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   B 16

    Baidakov, V. G.
    Mechanical instability and nucleation in a Lennard-Jones fcc crystal at limiting stretching [Electronic resource] / V. G. Baidakov, A. O. Tipeev // Chemical Physics Letters. - 2016. - Vol. 643. - С. 6-9. - Bibliogr. : p. 8-9 (38 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ACTIVATION MECHANISMS -- CRITICAL NUCLEI -- CRYSTAL PHASE
Аннотация: The method of molecular dynamics simulation has been used to investigate the mechanism of phase decay of a Lennard-Jones fcc crystal close to the boundary of a'ideal strength'. The attainability of states where the isothermal bulk modulus KT = ρ(∂p/∂ρ)T = 0 and KT < 0 has been demonstrated at negative pressures. It has been shown that the decay of the crystal phase proceeds by different activation mechanisms: (i) by the formation of voids at temperatures below that of the endpoint of the melting line and (ii) by liquid-phase critical nuclei formation above this temperature

\\\\expert2\\nbo\\Chemical Physics Letters\\2016, v. 643, p. 6-9.pdf
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4.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Mechanical instability and nucleation in a Lennard-Jones fcc crystal at limiting stretching [Electronic resource] / V. G. Baidakov, A. O. Tipeev // Chemical Physics Letters. - 2016. - Vol. 643. - С. 6-9. - Bibliogr. : p. 8-9 (38 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ACTIVATION MECHANISMS -- CRITICAL NUCLEI -- CRYSTAL PHASE
Аннотация: The method of molecular dynamics simulation has been used to investigate the mechanism of phase decay of a Lennard-Jones fcc crystal close to the boundary of a'ideal strength'. The attainability of states where the isothermal bulk modulus KT = ρ(∂p/∂ρ)T = 0 and KT < 0 has been demonstrated at negative pressures. It has been shown that the decay of the crystal phase proceeds by different activation mechanisms: (i) by the formation of voids at temperatures below that of the endpoint of the melting line and (ii) by liquid-phase critical nuclei formation above this temperature

\\\\expert2\\nbo\\Chemical Physics Letters\\2016, v. 643, p. 6-9.pdf
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5.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Metastable extension of the melting line and the critical endpoint / V. G. Baidakov, S. P. Protsenko, O. A. Tipeev // Journal of Non-Crystalline Solids : 9th International Symposium on Crystallization in Glasses and Liquids Location, Foz do Iguacu, BRAZIL, 10-13 sep. , 2009 . - 2009. - Vol.356, №52-54. - С. 2923-2927
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LENNARD-JONES SYSTEM -- NEGATIVE PRESSURES
Аннотация: Molecular-dynamics methods have been employed to calculate the (p, rho, T)-properties and the internal energy of the Lennard-Jones crystal and liquid phases in both stable and metastable states to the boundaries of limiting supersaturations. Thermal and caloric equations of state have been formulated for determining the parameters of phase equilibrium and approximating the boundaries of essential instability (the spinodal curves). The results of calculations of phase equilibrium parameters from the condition of chemical potentials equality show that the melting line in the region of its metastable extension approaches the spinodal of a stretched liquid. The point of contact (the critical endpoint) is characterized by the following parameter values: T*(m)= 0.5286, p*(m) = -1.7128, rho*(m,l) = 0.7374, rho*(m,c) = 0.9423. The melting line and its metastable extension were also calculated by simulations of two-phase liquid-crystal systems. A comparison of these two approaches has been performed. (C) 2010 Elsevier B.V. All rights reserved

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6.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Metastable extension of the melting line and the critical endpoint / V. G. Baidakov, S. P. Protsenko, O. A. Tipeev // Journal of Non-Crystalline Solids : 9th International Symposium on Crystallization in Glasses and Liquids Location, Foz do Iguacu, BRAZIL, 10-13 sep. , 2009 . - 2009. - Vol.356, №52-54. - С. 2923-2927
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LENNARD-JONES SYSTEM -- NEGATIVE PRESSURES
Аннотация: Molecular-dynamics methods have been employed to calculate the (p, rho, T)-properties and the internal energy of the Lennard-Jones crystal and liquid phases in both stable and metastable states to the boundaries of limiting supersaturations. Thermal and caloric equations of state have been formulated for determining the parameters of phase equilibrium and approximating the boundaries of essential instability (the spinodal curves). The results of calculations of phase equilibrium parameters from the condition of chemical potentials equality show that the melting line in the region of its metastable extension approaches the spinodal of a stretched liquid. The point of contact (the critical endpoint) is characterized by the following parameter values: T*(m)= 0.5286, p*(m) = -1.7128, rho*(m,l) = 0.7374, rho*(m,c) = 0.9423. The melting line and its metastable extension were also calculated by simulations of two-phase liquid-crystal systems. A comparison of these two approaches has been performed. (C) 2010 Elsevier B.V. All rights reserved

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7.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Metastable extension of the melting line and the critical endpoint / V. G. Baidakov, S. P. Protsenko, A. O. Tipeev // Journal of Non-Crystalline Solids. - 2010. - Vol.356, №52-54. - С. 2923-2927
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LENNARD-JONES SYSTEM -- NEGATIVE
Аннотация: Molecular-dynamics methods have been employed to calculate the (p, ρ, T)-properties and the internal energy of the Lennard-Jones crystal and liquid phases in both stable and metastable states to the boundaries of limiting supersaturations. Thermal and caloric equations of state have been formulated for determining the parameters of phase equilibrium and approximating the boundaries of essential instability (the spinodal curves). The results of calculations of phase equilibrium parameters from the condition of chemical potentials equality show that the melting line in the region of its metastable extension approaches the spinodal of a stretched liquid. The point of contact (the critical endpoint) is characterized by the following parameter values: Tm⁎ = 0.5286, pm⁎ = − 1.7128, ρm,l⁎ = 0.7374, ρm,c⁎ = 0.9423. The melting line and its metastable extension were also calculated by simulations of two-phase liquid–crystal systems. A comparison of these two approaches has been performed.

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8.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Metastable extension of the melting line and the critical endpoint / V. G. Baidakov, S. P. Protsenko, A. O. Tipeev // Journal of Non-Crystalline Solids. - 2010. - Vol.356, №52-54. - С. 2923-2927
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LENNARD-JONES SYSTEM -- NEGATIVE
Аннотация: Molecular-dynamics methods have been employed to calculate the (p, ρ, T)-properties and the internal energy of the Lennard-Jones crystal and liquid phases in both stable and metastable states to the boundaries of limiting supersaturations. Thermal and caloric equations of state have been formulated for determining the parameters of phase equilibrium and approximating the boundaries of essential instability (the spinodal curves). The results of calculations of phase equilibrium parameters from the condition of chemical potentials equality show that the melting line in the region of its metastable extension approaches the spinodal of a stretched liquid. The point of contact (the critical endpoint) is characterized by the following parameter values: Tm⁎ = 0.5286, pm⁎ = − 1.7128, ρm,l⁎ = 0.7374, ρm,c⁎ = 0.9423. The melting line and its metastable extension were also calculated by simulations of two-phase liquid–crystal systems. A comparison of these two approaches has been performed.

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9.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Metastable extension of the sublimation curve and the critical contact point [Electronic resource] / V. G. Baidakov, S. P. Protsenko // Journal of Chemical Physics. - 2006. - Vol. 124, № 23. - P231101/1-231101/3
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SUPERHEATED LIQUIDS
Аннотация: Molecular dynamics methods have been employed in order to calculate the (p,?,T)-properties and the internal energy of gas and crystal phases in stable and metastable equilibrium coexistence states for a model system consisting of 2048 Lennard-Jones particles. Thermal and caloric equations of state and the spinodal curves of the vapor and crystal phases have been determined. A new algorithm for the computation of phase equilibrium curves is suggested. Employing this method, the sublimation curve and its metastable extension to temperatures above the triple point have been calculated. It is found that the crystal-gas phase equilibrium terminates on the spinodal of the superheated crystal. The point of contact of the sublimation line and the spinodal is a singular point of the thermodynamic surface of states of a simple system considered.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2006, v.124, p.231101.pdf
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10.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Metastable extension of the sublimation curve and the critical contact point [Electronic resource] / V. G. Baidakov, S. P. Protsenko // Journal of Chemical Physics. - 2006. - Vol. 124, № 23. - P231101/1-231101/3
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SUPERHEATED LIQUIDS
Аннотация: Molecular dynamics methods have been employed in order to calculate the (p,?,T)-properties and the internal energy of gas and crystal phases in stable and metastable equilibrium coexistence states for a model system consisting of 2048 Lennard-Jones particles. Thermal and caloric equations of state and the spinodal curves of the vapor and crystal phases have been determined. A new algorithm for the computation of phase equilibrium curves is suggested. Employing this method, the sublimation curve and its metastable extension to temperatures above the triple point have been calculated. It is found that the crystal-gas phase equilibrium terminates on the spinodal of the superheated crystal. The point of contact of the sublimation line and the spinodal is a singular point of the thermodynamic surface of states of a simple system considered.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2006, v.124, p.231101.pdf
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