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Rapid cooling of repulsive binary mixtures causes two ordering processes: unmixing with strong repulsion and crystallization with weak repulsion. This behavior is tunable by inter-species interactions.

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Area of Science:

  • Classical statistical mechanics
  • Soft matter physics
  • Computational condensed matter physics

Background:

  • Binary mixtures at infinite temperature behave as ideal gases.
  • Rapid cooling (quenching) to zero temperature induces ordering processes.
  • Interactions between particles significantly influence system behavior.

Purpose of the Study:

  • To investigate the ordering processes in classical, 3D, purely repulsive binary mixtures after rapid cooling.
  • To determine how tuning inter-species interactions affects the type of ordering.
  • To explore the universality of this phenomenon for repulsive potentials.

Main Methods:

  • Simulations of classical, three-dimensional, purely repulsive binary mixtures.
  • Instantaneous quenching from infinite temperature (ideal-gas state) to zero temperature.
  • Analysis of ordering processes as a function of inter-species repulsion strength.

Main Results:

  • Two distinct ordering processes were observed: chemical ordering (unmixing) and spontaneous crystallization.
  • Strong inter-species repulsion promotes unmixing, leading to chemical ordering.
  • Weak inter-species repulsion promotes spontaneous crystallization, maintaining chemical homogeneity.

Conclusions:

  • The type of ordering in rapidly cooled binary mixtures is controllable by inter-species interactions.
  • A transition in the potential-energy landscape topography underlies the dual ordering behavior.
  • The observed dual-type behavior is general for repulsive pair-interaction potentials.