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Polymorphic Crystalline Layer at the Crystallization Front.

Mengmeng Li1, Zhibin Xu1, Qi Zhang1

  • 1Department of Physics, <a href="https://ror.org/00q4vv597">The Hong Kong University of Science and Technology</a>, Clear Water Bay, Hong Kong, China.

Physical Review Letters
|January 3, 2025
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Summary
This summary is machine-generated.

Researchers observed crystal growth at the particle level, revealing a polymorphic surface layer near solid-solid transitions. This layer

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Area of Science:

  • Materials Science
  • Crystallography
  • Physical Chemistry

Background:

  • Crystal growth fronts and particle-level kinetics are not well understood.
  • Previous studies lacked single-particle resolution for growth dynamics.

Purpose of the Study:

  • To experimentally observe crystal growth fronts at the single-particle level.
  • To investigate the kinetics and morphology of crystal growth in colloidal systems.
  • To understand the behavior of crystal interfaces during solid-solid transitions.

Main Methods:

  • Utilized colloidal systems to model crystal growth.
  • Employed single-particle tracking to analyze kinetics.
  • Observed crystal growth front morphology in liquid environments.

Main Results:

  • A polymorphic crystal surface layer was observed near the solid-solid transition.
  • The surface layer thickness grows logarithmically with temperature approaching the transition.
  • Liquid-crystal interfaces show continuous growth, while crystal-crystal interfaces exhibit martensitic growth.

Conclusions:

  • The study reveals novel insights into particle-level crystal growth dynamics.
  • A distinct surface crystalline layer forms under specific interface conditions.
  • This surface layer can reduce defect density, aiding crystal fabrication.