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Updated: May 6, 2026

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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Published on: January 26, 2016

Intermittent cluster dynamics and temporal fractional diffusion in a bulk metallic glass.

Birte Riechers¹, Amlan Das^2,3, Eric Dufresne⁴

¹Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, 12205, Berlin, Germany.

Nature Communications

|August 3, 2024

Summary

Physical aging in metallic glasses reveals anomalous transport. We observed a transition to power-law behavior at long timescales, challenging traditional diffusion models and highlighting complex, non-monotonous aging dynamics.

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Area of Science:

Materials Science
Condensed Matter Physics
Physical Chemistry

Background:

Glassy solids undergo physical aging, transitioning to lower-energy states.
Characterizing structural relaxation times is crucial for understanding time-dependent properties.

Purpose of the Study:

To investigate atomic-scale micro-structural rearrangements during physical aging in metallic glasses.
To identify the transport mechanisms governing relaxation processes at extended timescales.

Main Methods:

Coherent X-ray scattering experiments over 300,000 seconds to track atomic rearrangements.
Atomistic simulations to complement experimental observations.

Main Results:

Demonstrated emergence of sub-diffusive anomalous transport and temporal fractional diffusion.
Observed a transition from stretched exponential to power-law behavior at long decorrelation times.
Revealed collective and intermittent atomic motion.

Conclusions:

Provided a physical basis for classical stretched exponential relaxation.
Uncovered a new power-law governed collective transport regime in metallic glasses.
Challenged conventional frameworks of homogeneous aging and atomic diffusion.