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Tracking the Connection between Disorder and Energy Landscape in Glasses Using Geologically Hyperaged Amber.

E A A Pogna1,2, A I Chumakov3,4, C Ferrante5,6

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This summary is machine-generated.

Ancient amber reveals how long-term aging impacts glass properties. Hyperaging in fossil amber alters vibrational states and structural characteristics, offering insights into the energy landscape of amorphous materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Geochemistry

Background:

  • Fossil amber, aged over 110 million years, serves as a natural laboratory for studying amorphous materials.
  • Understanding the evolution of glasses' properties over geological timescales is crucial for materials science.

Purpose of the Study:

  • To investigate the link between the potential energy landscape and the structural/vibrational properties of glasses.
  • To analyze the effects of natural aging (hyperaging) on amber's properties.

Main Methods:

  • X-ray scattering techniques were applied to fossil amber samples.
  • Samples were analyzed before and after annealing to erase thermal history.

Main Results:

  • Hyperaging leads to a depletion of vibrational density of states in the terahertz region, affecting acoustic wave properties.
  • Amber densification occurred, with structural implications distinct from hydrostatic compression.
  • Approaching the potential energy landscape minimum reduced disorder and increased long-range correlation in the elastic matrix.

Conclusions:

  • A direct correlation exists between a glass's potential energy landscape and its structural and vibrational characteristics.
  • Hyperaging significantly modifies the properties of amorphous materials over geological timescales.
  • Fluctuating elasticity theory provides a framework for understanding these aging-induced changes in glasses.