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Related Experiment Videos

Liquid-liquid phase transition in supercooled silicon.

Srikanth Sastry1, C Austen Angell

  • 1Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Campus, Bangalore 560064, India. sastry@jncasr.ac.in

Nature Materials
|October 14, 2003
PubMed
Summary

Researchers provide simulation evidence that the liquid-amorphous transition in silicon is a first-order thermodynamic transition between two distinct liquid states. This finding offers insights into the phase behavior of tetrahedral network liquids and amorphous semiconductors.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Amorphous silicon and its liquid form are crucial in materials science, structurally relating to amorphous semiconductors with unique pressure-induced transitions.
  • Liquid silicon shares thermodynamic similarities with 'tetrahedral network' liquids like water, exhibiting density anomalies.

Purpose of the Study:

  • To provide detailed simulation evidence for the nature of the liquid-amorphous transition in silicon.
  • To investigate the thermodynamic order and phase behavior of supercooled liquid silicon.
  • To explore the implications of this transition for related materials and liquid dynamics.

Main Methods:

  • Utilized detailed and unambiguous computer simulations based on the Stillinger-Weber potential.

Related Experiment Videos

  • Analyzed the thermodynamic properties and phase transitions of supercooled liquid silicon.

    • Main Results:

    • Confirmed the transition in supercooled liquid silicon is thermodynamically of first order.
    • Demonstrated the transition occurs between two distinct liquid states, supporting Aptekar's prediction.
    • Presented evidence for spinodal divergences near the transition and a shift from fragile to strong liquid dynamics.

    Conclusions:

    • The liquid-amorphous transition in silicon is a first-order phase transition between two liquid states.
    • This transition is relevant for understanding phase behavior in tetrahedral network liquids and amorphous semiconductors.
    • The transition signifies a change in liquid dynamics, from fragile to strong liquid characteristics.