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Calcium silicate glasses show network depolymerization with increasing CaO content. This structural change impacts their properties, differing from alkali silicate glasses.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Geochemistry

Background:

  • Silicate glasses are crucial in various industries.
  • Understanding their structure-property relationships is key for material design.
  • Calcium oxide (CaO) acts as a network modifier in silicate systems.

Purpose of the Study:

  • To investigate the structural evolution of CaO-SiO2 glasses.
  • To quantify the speciation of silicon (Q species) as a function of CaO content.
  • To correlate structural changes with glass properties like glass transition temperature (Tg).

Main Methods:

  • Synthesis of binary CaO-SiO2 glasses using container-less aerodynamic levitation and CO2-laser heating.
  • Quantification of Q speciation via (29)Si and (17)O magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy.
  • Measurement of glass transition temperature (Tg).

Main Results:

  • Progressive depolymerization of the silicate network with increasing CaO content.
  • Significant deviation of Q speciation from the ideal binary model.
  • Increased packing density, structural rigidity, and Tg with higher CaO concentrations.
  • Equilibrium constants for Q species disproportionation are comparable to Mg-silicate glasses, not Li-silicate glasses.

Conclusions:

  • CaO acts as a network modifier, leading to depolymerization and increased Tg in CaO-SiO2 glasses.
  • The behavior of CaO differs from alkali modifiers, showing a role reversal in alkaline-earth silicate glasses.
  • These findings provide insights into the structure-property correlations in silicate glasses.