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The laboratory glass transition.

Prabhat K Gupta1, John C Mauro

  • 1Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio 43210, USA.

The Journal of Chemical Physics
|June 22, 2007
PubMed
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This study explains universal glass transition features using an enthalpy landscape framework. It introduces the extrinsically constrained liquid concept to describe glassy states and derive material properties.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Statistical Mechanics

Background:

  • The laboratory glass transition is a complex phenomenon.
  • Existing models often struggle to explain universal features of the glassy state.

Purpose of the Study:

  • To provide a unified framework for understanding the phenomenology of the laboratory glass transition.
  • To explain universal features of the glassy state using a novel approach.

Main Methods:

  • Examination of the laboratory glass transition within the enthalpy landscape framework.
  • Development of a generic description of the glassy state based on phase space partitioning.
  • Derivation of expressions for glass properties and transition changes using the extrinsically constrained liquid model.

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Main Results:

  • A generic description of the glassy state, termed the extrinsically constrained liquid, explains universal glass transition features.
  • Expressions for glass properties and property changes at the laboratory glass transition were derived.
  • The model illustrates concepts using an enthalpy landscape.

Conclusions:

  • The extrinsically constrained liquid model provides a comprehensive explanation for glass transition phenomenology.
  • New insights into the role of complexity and zero residual entropy in glasses are discussed.