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Evidence of Multiple Crystallization Pathways in Lithium Disilicate: A Metadynamics Investigation.

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Metadynamics simulations reveal three crystallization pathways for lithium disilicate. The most favorable route involves disordered layers ordering internally, crucial for understanding crystal formation.

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Area of Science:

  • Materials Science
  • Crystallography
  • Computational Chemistry

Background:

  • Lithium disilicate (Li2Si2O5) is a key component in various glass-ceramics.
  • Understanding its crystallization pathways from melt is essential for material property control.

Purpose of the Study:

  • To elucidate the distinct crystallization pathways of lithium disilicate from a melt.
  • To identify the energetic favorability and intermediate structures of these pathways.

Main Methods:

  • Metadynamics simulations utilizing two X-ray diffraction peaks.
  • Analysis of potential energy landscapes and intermediate structural formations.

Main Results:

  • Three crystallization pathways were identified: a favorable layered ordering, a phase-separated route via beta-cristobalite, and a high-energy unlikely pathway.
  • The most favorable pathway proceeds through disordered layered structures.
  • A second pathway involves phase separation and requires an intermediate with silicate rings (2.5 kJ/mol per f.u.).

Conclusions:

  • The study provides a detailed atomistic understanding of lithium disilicate crystallization.
  • The findings highlight the importance of intermediate structures and energy barriers in determining crystallization routes.
  • Computational simulations offer valuable insights into glass-ceramic formation.