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Fragility and basic process energies in vitrifying systems.

Julio Cesar Martinez-Garcia1, Sylwester J Rzoska2, Aleksandra Drozd-Rzoska3

  • 1Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, Berne CH-3012, Switzerland.

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Summary
This summary is machine-generated.

Fragility, a key metric in glass transition science, is determined by the ratio of activation enthalpy to activation energy. This finding offers a universal scaling plot for glass-forming dynamics.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Fragility is a central concept in glass transition science, used as a universal metric for previtreous dynamics.
  • Understanding fragility is crucial for a conceptual breakthrough in glass transition science.

Purpose of the Study:

  • To determine the fundamental meaning of fragility.
  • To establish a new universal scaling plot for the dynamics of glass formers.

Main Methods:

  • Analysis of experimental data without relying on specific physical models.
  • Investigated a wide range of materials including liquids, polymers, plastic crystals, and liquid crystals.

Main Results:

  • Fragility is defined by the ratio of activation enthalpy to activation energy.
  • A new general scaling plot for the dynamics of any glass former was developed.
  • The limitations of existing semi-empirical relationships between fragility and activation energy were demonstrated.

Conclusions:

  • The ratio of activation enthalpy to activation energy provides a fundamental definition of fragility.
  • The new scaling plot is applicable to diverse glass-forming systems.
  • Results are valid for complex systems and collective phenomena described by super-Arrhenius relations.