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Iodine solubility and speciation in glasses.

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This study investigated iodine solubility in sodium borosilicate glasses. Iodine incorporation depends on glass composition, with higher solubility in boron-rich formulations, crucial for materials science and waste management.

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Area of Science:

  • Materials Science
  • Geochemistry
  • Nuclear Waste Management

Background:

  • Iodine's behavior in glass matrices is critical for applications in materials science and nuclear waste disposal.
  • Understanding iodine solubility and speciation in glasses informs the development of stable containment materials.

Purpose of the Study:

  • To identify glass compositions in the Na2O-B2O3-SiO2 system capable of dissolving significant amounts of iodine.
  • To determine the key parameters influencing iodine solubility and its structural state within the glass network.

Main Methods:

  • Synthesis and characterization of sodium borosilicate glasses with varying compositions.
  • Determination of iodine solubility limits through experimental measurements.
  • Structural analysis using Raman spectroscopy, X-ray Absorption Spectroscopy (XAS), and 11B Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

  • Iodine solubility is strongly dependent on the bulk chemistry and physical properties of the glass.
  • A solubility limit of approximately 5 mol% iodine was observed in B2O3-rich glasses, while SiO2-rich glasses showed a limit of about 1 mol%.
  • Spectroscopic analyses revealed the presence of various iodine species, predominantly iodide (I-), coordinated with sodium ions (Na+).

Conclusions:

  • The fragility parameter of the glass network effectively explains the observed compositional dependence of iodine solubility.
  • The findings provide crucial insights into the design of iodine-dissolving glass matrices for diverse scientific and industrial applications.