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Dissolution Kinetics of Hot Compressed Oxide Glasses.

Nerea Mascaraque1, Mathieu Bauchy2, José Luis G Fierro3

  • 1Department of Chemistry and Bioscience, Aalborg University , 9220 Aalborg, Denmark.

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Hot compression enhances oxide glass durability by altering network structure, improving resistance to dissolution. This effect depends on glass composition and applied pressure, offering a new route for material optimization.

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Area of Science:

  • Materials Science
  • Glass Chemistry
  • Geochemistry

Background:

  • Chemical durability of oxide glasses is crucial for applications.
  • Compositional tuning has limitations due to high oxygen content.
  • Post-treatment offers an alternative for enhancing glass properties.

Purpose of the Study:

  • Investigate the effect of hot compression on the dissolution kinetics of various oxide glasses.
  • Understand how compression influences chemical durability and dissolution mechanisms.
  • Explore the relationship between topological changes and chemical durability.

Main Methods:

  • Hot compression of phosphate, silicophosphate, borophosphate, borosilicate, and aluminoborosilicate glasses at 0.5, 1.0, and 2.0 GPa.
  • Measurement of weight loss and modifier leaching in acidic (pH 2) and neutral (pH 7) solutions.
  • Analysis of topological changes, nonbridging oxygens, network cross-linking, and chemical topological constraints (nc).

Main Results:

  • Hot compression generally improves chemical durability, but effects are composition- and pressure-dependent.
  • Dissolution mechanisms are linked to topological changes from densification.
  • A direct correlation was found between chemical durability and the number of chemical topological constraints per atom (nc).

Conclusions:

  • Hot compression is an effective post-treatment for enhancing oxide glass chemical durability.
  • The observed improvements are attributed to pressure-induced topological modifications within the glass network.
  • Chemical topological constraints (nc) serve as a predictive parameter for glass chemical durability.