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Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational physics

Background:

  • Understanding the dynamic properties of liquid metals is crucial for various industrial applications.
  • Density-functional theory (DFT) provides a powerful framework for atomistic simulations.

Purpose of the Study:

  • To investigate the dynamic properties of liquid aluminum.
  • To compare the accuracy of local-density (LDA) and generalized gradient (GGA) approximations in DFT for liquid aluminum.
  • To analyze the impact of approximations on self-diffusion and viscosity.

Main Methods:

  • Direct calculation of self-diffusion coefficient and viscosity.
  • Application of density-functional theory (DFT) with LDA and GGA approximations.
  • Analysis of icosahedral short-range order (ISRO) and backscattering effects.

Main Results:

  • LDA approximation shows better agreement with experimental data for dynamic properties.
  • GGA approximation leads to enhanced ISRO and significant backscattering, negatively impacting self-diffusion.
  • Deviations from Stokes-Einstein relation and universal scaling law were observed.

Conclusions:

  • LDA is favored for accurate computation of liquid aluminum's dynamic properties.
  • GGA's influence on ISRO and backscattering highlights its limitations for these properties.
  • Further investigation into liquid metal dynamics and scaling laws is warranted.