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Phase evolution on heat treatment of sodium silicate water glass

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
354
Identifiers
DOI: 10.1016/j.jnoncrysol.2007.08.037
Keywords
  • X-Ray Diffraction
  • Scanning Electron Microscopy
  • Alkali Silicates
  • Phases And Equilibria
Disciplines
  • Earth Science

Abstract

Abstract Heat treatment of sodium silicate water glass of the nominal composition Na 2O/SiO 2 = 1:3 was carried out from 100 °C up to 800 °C and the advancement of the resulting phases was followed up by powder X-ray diffraction, scanning electron microscopy and thermogravimetry along with differential thermal analysis. The water glass, initially being an amorphous solid, starts to form crystals of β-Na 2Si 2O 5 at about 400 °C and crystallizes the SiO 2 modification cristobalite at about 600 °C that coexists along with β-Na 2Si 2O 5 up to 700 °C. At 750 °C Na 6Si 8O 19 appears as a separate phase and beyond 800 °C, the system turns into a liquid.

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