Influence of Attractive Parts of Interaction Potentials on Critical Point Parameters
DOI:
https://doi.org/10.15407/ujpe70.11.787Keywords:
Morse potential, Curie–Weiss-type potential, attraction strength, critical point parameters, phase transitionsAbstract
We will investigate how microscopic features of interparticle potentials influence the macroscopic critical point parameters. Our analytic calculations are based on the cell model for continuous many-particle systems. We will explore two types of pair interactions described by the Morse potential and a Curie–Weiss-type potential. For the Morse fluids, we present numerical results obtained with the microscopic parameters corresponding to the alkali metals sodium (Na) and potassium (K). The calculated dimensionless critical point parameters for liquid Na and K, expressed in dimensional units, allow for the direct comparison with available experimental and simulation data. For the Curie–Weiss cell model with competing interactions, which exhibits a sequence of first-order phase transitions, we examine the critical parameters for the first three critical points. We analyze our results by varying the attractive part of the Morse potential and the Curie–Weiss attraction strength, providing the insights into how these microscopic characteristics change the critical point coordinates.
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