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This study introduces a novel multithermal-multibaric simulation method for comprehensive temperature-pressure phase diagram analysis. It ensures uniform sampling, enabling accurate calculation of physical properties across diverse conditions.

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Area of Science:

  • Computational Physics
  • Materials Science
  • Chemical Physics

Background:

  • Molecular dynamics simulations are crucial for understanding material properties.
  • Exploring the full temperature-pressure (TP) phase diagram is computationally challenging.
  • Existing methods often struggle with uniform sampling across wide TP ranges.

Purpose of the Study:

  • To develop a method for efficient multithermal-multibaric molecular dynamics simulations.
  • To enable uniform sampling across entire temperature-pressure regions.
  • To accurately calculate static physical quantities over targeted TP ranges.

Main Methods:

  • Utilized a variational principle to construct an energy and volume bias.
  • Implemented on-the-fly determination of relevant energy and volume regions.
  • Performed multithermal-multibaric simulations to achieve uniform sampling.

Main Results:

  • Demonstrated the ability to sample entire TP phase diagram regions.
  • Guaranteed adequate statistical sampling for chosen TP intervals.
  • Successfully calculated static physical quantities across targeted TP ranges.

Conclusions:

  • The developed method provides a robust approach for TP phase diagram exploration.
  • This technique is effective for studying phenomena like the density anomaly in water.
  • Enables comprehensive analysis of material behavior under varying temperature and pressure conditions.