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Related Experiment Video

Updated: Jan 2, 2026

Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
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Energy transport in glasses.

Elijah Flenner1, Lijin Wang, Grzegorz Szamel

  • 1Chemistry Department, Colorado State University, Fort Collins, Colorado 80523, USA. flennere@gmail.com.

Soft Matter
|December 13, 2019
PubMed
Summary

This study reveals how thermal diffusivity in glasses transitions from diffusive to ballistic energy transport. Understanding this frequency dependence is key for developing advanced glass materials with tailored thermal properties.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Thermal conductivity in glasses is crucial for many applications.
  • Understanding energy transport mechanisms at different frequencies is essential.
  • The frequency-dependent thermal diffusivity (d(ω)) characterizes energy transport.

Purpose of the Study:

  • To investigate the frequency dependence of thermal diffusivity (d(ω)) in poorly annealed and stable glasses.
  • To characterize the transition in energy transport mechanisms from diffusive to ballistic.
  • To explore the relationship between wave packet dynamics and thermal diffusivity.

Main Methods:

  • Utilizing the swap Monte Carlo algorithm to prepare glass samples.
  • Exciting wave packets within the glass to observe energy propagation.

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  • Analyzing wave packet dynamics (e.g., width over time) to calculate d(ω).

    • Main Results:

    • Observed diffusive energy transport for high frequencies, transitioning to localized energy at higher frequencies.
    • Identified a robust method for calculating d(ω) in an intermediate frequency regime where wave packets deviate from Gaussian behavior.
    • Found a transition from frequency-independent thermal diffusivity at high frequencies to d(ω) ∼ ω-4 at low frequencies.

    Conclusions:

    • Energy transport in glasses exhibits a transition from diffusive to ballistic behavior as frequency decreases.
    • Low-frequency energy transport is dominated by sound waves and can be predicted by sound attenuation coefficients.
    • The study provides insights into the fundamental mechanisms governing thermal transport in amorphous materials.