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Updated: Jun 18, 2025
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Are Critical Fluctuations Responsible for Glass Formation?
Szymon Starzonek1, Joanna Łoś2, Sylwester J Rzoska2
1Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, 1000 Ljubljana, Slovenia.
Materials (Basel, Switzerland)
|July 27, 2024
Summary
Dynamic heterogeneities before the glass transition exhibit critical behavior. This finding suggests the glass transition can be explained by critical phenomena theory, impacting material science applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Physical Chemistry
Background:
- Dynamic heterogeneities are hypothesized to cause amorphization in supercooled systems.
- This hypothesis forms the basis of the widely accepted theory for the glass transition puzzle.
Purpose of the Study:
- To verify the existence of a strong pretransitional anomaly near the glass transition temperature (Tg).
- To investigate the critical characteristics of dynamic heterogeneities in supercooled liquid-crystalline systems.
Main Methods:
- Utilized broadband dielectric spectroscopy (BDS) to measure pretransitional anomalies.
- Employed nonlinear dielectric effect (NDE) methods to analyze dynamic heterogeneities near Tg.
Main Results:
- Demonstrated that dynamic heterogeneities exhibit critical characteristics with a critical exponent α=0.5.
- Observed a strong pretransitional anomaly in supercooled liquid-crystalline systems.
Conclusions:
- The observed dynamic heterogeneities are identified as critical fluctuations.
- The glass transition can be described using the theory of critical phenomena.
- Understanding critical fluctuations is key for advancements in energy storage, materials design, and sustainability.
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