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Related Experiment Videos

Pressure amorphization through displacive disorder.

M H Cohen1, J Iñiguez, J B Neaton

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854-8019, USA. mcohen@physics.rutgers.edu

The European Physical Journal. E, Soft Matter
|March 11, 2004
PubMed
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Pressure amorphization (PA) in materials occurs due to phonon spectrum softening under pressure, even with crystalline topology. Langevin simulations confirm increased amorphization probability with system size, supporting the displacive disorder theory.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Crystallography

Background:

  • Amorphous materials can be classified by topology.
  • Pressure amorphization (PA) is a phenomenon where crystalline materials transform into amorphous states under high pressure.
  • A recent theory links PA to displacive disorder and softening of phonon spectrum branches.

Purpose of the Study:

  • To review and support the theory of pressure amorphization (PA) driven by displacive disorder.
  • To investigate the relationship between system size and amorphization probability using a simple model.
  • To explore the generalization of the model for real material systems.

Main Methods:

  • Classification of amorphous materials based on topology.
  • Review of the displacive disorder theory of pressure amorphization.

Related Experiment Videos

  • Langevin simulations of a simplified model exhibiting PA characteristics.

    • Main Results:

    • The theory posits that softening and flattening of phonon spectrum branches under pressure induce PA.
    • Simulations demonstrated that the probability of amorphization increases with the number of unit cells in the model system.
    • The model successfully replicates key features observed in materials undergoing PA with displacive disorder.

    Conclusions:

    • The study supports the theory that displacive disorder and phonon spectrum softening are key mechanisms for pressure amorphization.
    • System size plays a crucial role in the probability of amorphization.
    • The developed model provides a framework for studying PA in real materials.