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Crystal nucleation in the hard sphere system.

Brendan O'Malley1, Ian Snook

  • 1Department of Applied Physics, RMIT, GPO Box 2476V, Melbourne, Victoria, Australia, 3001.

Physical Review Letters
|March 14, 2003
PubMed
Summary
This summary is machine-generated.

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Computer simulations reveal compact crystal nuclei forming in the hard sphere liquid model. These nuclei exhibit diverse structures, often featuring multiply twinned particles with decahedral characteristics, challenging previous assumptions about their formation.

Area of Science:

  • Condensed matter physics
  • Computational materials science
  • Statistical mechanics

Background:

  • Understanding crystal nucleation is crucial for materials science.
  • The hard sphere system is a fundamental model for liquid and solid phases.
  • Previous models often assumed simpler nucleation pathways.

Purpose of the Study:

  • To investigate the structure and growth of spontaneously forming crystal nuclei.
  • To analyze the morphology of nuclei in the hard sphere liquid model.
  • To elucidate the nucleation mechanisms in a simple, nontrivial liquid system.

Main Methods:

  • Utilizing computer simulations.
  • Employing the hard sphere system as a model liquid.
  • Analyzing the phase diagram and particle arrangements within simulated nuclei.

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Main Results:

  • Observed compact crystal nuclei formation within the coexistence region of the phase diagram.
  • Identified a variety of nuclei morphologies, with a prevalence of multiply twinned particles.
  • Noted significant decahedral character in some multiply twinned particles.
  • Found that multiply twinned particles nucleate as face-centered cubic crystal blocks with stacking faults, not from decahedral cores.

Conclusions:

  • Crystal nuclei in the hard sphere model exhibit complex, non-ideal morphologies.
  • Multiply twinned particles are a significant feature of nucleation in this system.
  • The nucleation pathway involves face-centered cubic blocks and stacking faults, rather than simple decahedral growth.