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High chloride content calcium silicate glasses.

Xiaojing Chen1, Natalia Karpukhina1, Delia S Brauer2

  • 1Dental Physical Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, UK. n.karpukhina@qmul.ac.uk r.hill@qmul.ac.uk xiaojing.chen@qmul.ac.uk.

Physical Chemistry Chemical Physics : PCCP
|February 23, 2017
PubMed
Summary

This study successfully synthesized silicate glasses incorporating high amounts of calcium chloride (CaCl2), retaining 70% chloride. The addition of CaCl2 significantly reduced glass transition temperature and altered crystallization behavior.

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Area of Science:

  • Materials Science
  • Glass Chemistry
  • Inorganic Chemistry

Background:

  • Chloride volatilization from silicate melts limits oxychloride glass studies.
  • Limited research exists on silicate glasses with high chloride content.

Purpose of the Study:

  • To synthesize and characterize silicate glasses with high calcium chloride (CaCl2) content.
  • To investigate the effect of CaCl2 incorporation on glass properties and structure.

Main Methods:

  • Melt quench route for glass synthesis.
  • Incorporation of up to 31.6 mol% CaCl2 into calcium metasilicate (CaO·SiO2) composition.
  • Characterization using 29Si MAS-NMR spectroscopy, thermal analysis (Tg, crystallization temperature), and density measurements.

Main Results:

  • Achieved high chloride retention (average 70%) and successful incorporation of up to 31.6 mol% CaCl2 without crystallization.
  • 29Si MAS-NMR indicated Q2 silicate species, suggesting chloride formed Cl-Ca bonds, not Si-Cl bonds.
  • CaCl2 addition significantly reduced glass transition temperature (Tg) from 782 °C to 370 °C and decreased density and crystallization temperature.

Conclusions:

  • Silicate glasses can effectively retain significant amounts of CaCl2.
  • CaCl2 incorporation leads to structural changes and altered thermal properties, with a breakpoint around 20 mol% CaCl2.
  • Crystallization behavior transitions from wollastonite to CaCl2 at higher CaCl2 content, dependent on crystallization temperature relative to CaCl2 melting point.