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Area of Science:

  • Physics
  • Physical Chemistry

Background:

  • Fluid polyamorphism involves multiple fluid-fluid phase transitions within a single substance.
  • These transitions arise from interconversion between distinct molecular or supramolecular states.

Purpose of the Study:

  • Investigate the consequences of degenerate interconversion in fluid polyamorphism.
  • Analyze the formation of symmetrical tricritical points in a compressible binary lattice model.

Main Methods:

  • Performed mean-field analysis.
  • Conducted 3D Monte Carlo simulations of the "blinking-checkers model" with interconverting species.

Main Results:

  • Demonstrated coupling between interconversion fraction and total density can produce a symmetrical tricritical point.
  • Observed that this point terminates second-order transitions with first-order transitions between fluid states.
  • Showed that ordered-disordered fluid transitions can occur in either liquid or gaseous phases.

Conclusions:

  • Degenerate interconversion in fluid systems can lead to symmetrical tricritical points, analogous to those in superfluid helium and magnetic materials.
  • The blinking-checkers model provides a framework for understanding these complex phase behaviors.
  • Coupling of nonconserved and conserved order parameters is key to generating these unique phase transitions.