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Activation Entropy as a Key Factor Controlling the Memory Effect in Glasses.

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The Kovacs memory effect in metallic glasses occurs when activation entropy (S*) is large. This finding offers new insights into glass relaxation dynamics and heterogeneous systems.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • The Kovacs memory effect, observed in glasses, involves non-monotonic changes in enthalpy and volume during isothermal annealing.
  • This phenomenon is typically attributed to heterogeneous dynamics within the material.
  • Understanding the conditions for the memory effect is crucial for characterizing glass behavior.

Purpose of the Study:

  • To investigate the Kovacs memory effect in a model Au-based metallic glass.
  • To determine the role of activation entropy (S*) in the manifestation of the memory effect.
  • To establish a link between S* and the observation of the memory effect.

Main Methods:

  • Utilized a high-precision, high-rate calorimeter for precise measurements.
  • Performed isothermal annealing experiments on a model Au-based metallic glass.
  • Applied absolute reaction rate theory to calculate activation entropy (S*).

Main Results:

  • The memory effect was observed only when the second-annealing process exhibited a large activation entropy (S*).
  • A clear correlation was found between the magnitude of S* and the presence of the memory effect.
  • The study quantified the critical S* threshold for observing the memory effect.

Conclusions:

  • A large activation entropy (S*) is a critical requirement for observing the Kovacs memory effect in metallic glasses.
  • These findings provide a new perspective for understanding the memory effect in both thermal and athermal systems.
  • The results highlight the importance of S* in governing complex relaxation dynamics in glasses.