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Related Experiment Videos

Structure of hard-sphere fluid and precursor structures to crystallization.

Brendan O'Malley1, Ian Snook

  • 1Applied Physics, School of Applied Sciences, Science, Engineering, and Technology, Royal Melbourne Institute of Technology University, Portfolio, G.P.O. Box 2476V, Melbourne, Victoria 3001, Australia.

The Journal of Chemical Physics
|August 20, 2005
PubMed
Summary

The split peak in liquid structure indicates emerging crystalline order. This finding links fluid and crystal phases, revealing frustrated crystal formation in glassy systems.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Statistical mechanics

Background:

  • Supercooled liquids and glasses exhibit a characteristic split second peak in their radial distribution function.
  • Understanding this structural feature is crucial for bridging the gap between fluid and crystalline states.

Purpose of the Study:

  • To investigate the structural origin of the split second peak in the radial distribution function of supercooled liquids.
  • To establish a structural link between fluid and crystalline phases using the hard-sphere fluid as a model system.

Main Methods:

  • Development of a novel method to analyze microscopic fluid structure.
  • Decomposition of radial distribution and bond-angle distribution functions into contributions from ring structures.
  • Utilizing a modified shortest-path definition for ring identification in dense systems.

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Main Results:

  • The split peak is identified as a signature of precursor structures to crystal formation.
  • The analysis reveals contributions from specific ring structures to the observed peak.
  • The phenomenon is linked to the frustration of crystalline order in the fluid phase.

Conclusions:

  • The split peak signifies the emergence of crystalline order, not a feature unique to glassy states.
  • This structural characteristic provides a direct link between fluid and crystalline phases.
  • The findings reframe the split peak as an indicator of frustrated crystallization in simple glassy systems.