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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Glass Science

Background:

  • Sodium borosilicate glasses are technologically important materials.
  • Understanding their response to high pressure is crucial for material design.
  • Previous studies have explored compression effects on similar glass systems.

Purpose of the Study:

  • To investigate the structural response of sodium borosilicate glasses to hydrostatic compression up to 20 GPa.
  • To analyze the mechanisms of densification and permanent structural modifications.
  • To correlate structural changes with varying sodium content.

Main Methods:

  • Classical molecular dynamics simulations were employed.
  • Three sodium borosilicate glasses with different sodium concentrations were simulated.
  • Isostatic compression and decompression cycles were performed up to 20 GPa.

Main Results:

  • Atomic packing density is the primary factor controlling glass densification and permanent structural changes.
  • Bulk modulus increases linearly up to 15 GPa, then more rapidly at higher pressures.
  • Shortening of Na-Na and Na-O bonds and high compressibility of Na-rich regions were observed during compression.

Conclusions:

  • The study elucidates the pressure-induced structural evolution in sodium borosilicate glasses.
  • Atomic packing and the compressibility of specific regions dictate the material's response to stress.
  • Results provide insights into the mechanical behavior and structural stability of these glasses under extreme conditions.