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Russian Journal of Physical Chemistry A

, Volume 93, Issue 1, pp 106–115 | Cite as

Structure, Thermodynamic Properties, and Shock Compression of Bismuth–Lead Melts and Correlation Effect during Diffusion. Molecular Dynamics

  • D. K. BelashchenkoEmail author
STRUCTURE OF MATTER AND QUANTUM CHEMISTRY
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Abstract

The models of Bi–Pb solutions were constructed by molecular dynamics at temperatures of up to 30 000 K and pressures of up to 282 GPa. The embedded atom model (EAM) potentials for pure components and the Lennard-Jones potential for pairs 12 are used. The density isobar at normal pressure and the solution formation heat isotherm at 700 K were in good agreement with experiment. The thermodynamic (density, energy, heat capacity, compression modulus, sound velocity, and Gruneisen coefficients), structural, and diffusion properties of the eutectic Bi55Pb45 melt at normal pressure and temperatures of up to 2900 K and under conditions of shock compression were calculated. At elevated pressure, the negative deviations from ideality change to positive ones. A molecular-dynamic calculation of the mutual diffusion coefficients at 550–928 K was performed on the melt models. The interdiffusion coefficients found by the molecular dynamics method are smaller than those measured experimentally by the capillary method by a factor of 1.25–1.64. The correlation effect during diffusion in melts similar to the cataphoretic effect in ionic solutions is confirmed. In Bi–Pb solutions with negative deviations from ideality, the correlation factor is substantially smaller than unity. In the equation for the interdiffusion coefficient, the thermodynamic factor and the correlation factor partially cancel each other.

Keywords:

molecular dynamics method Lennard-Jones potential Bi–Pb model solutions mutual diffusion coefficient correlation factor 

Notes

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.National University of Science and Technology MISiSMoscowRussia

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