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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Molecular Cross-correlations Govern Structural Rearrangements in a Nonassociating Polar Glass Former.

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Collective dynamics, not single-particle motion, govern structural relaxation in supercooled liquids. This finding challenges previous views and highlights the importance of dielectric spectroscopy in understanding glass science dynamics.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Physical chemistry

Background:

  • Recent studies using photon correlation spectroscopy and dielectric spectroscopy have debated the nature of structural relaxation in supercooled liquids.
  • Discrepancies exist regarding whether generic or nonuniversal responses reflect the liquid's true structural relaxation dynamics.

Purpose of the Study:

  • To directly investigate the structural relaxation of a nonassociating glass-forming liquid.
  • To resolve the controversy surrounding the interpretation of dynamics observed via different experimental techniques.
  • To elucidate the fundamental mechanisms governing structural relaxation in supercooled liquids.

Main Methods:

  • Employing physical aging techniques.
  • Utilizing oscillatory shear rheology to probe structural relaxation.
  • Analyzing collective equilibrium fluctuations and single-particle dynamics.

Main Results:

  • Structural relaxation is governed by collective equilibrium fluctuations, not by single-particle dynamics.
  • The study challenges the decomposition of glassy response into Debye-type and single-particle dynamics.
  • Findings indicate that collective dynamics are the primary drivers of structural relaxation.

Conclusions:

  • Collective dynamics of simple liquids, rather than single-particle motion, dictate structural relaxation.
  • The study provides evidence against the generic decomposition of glassy response in polar supercooled liquids.
  • Dielectric spectroscopy is confirmed as a crucial technique for sensing dynamical cooperativity in glass science.