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Characterization of a mould flux glass

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
351
Issue
1
Identifiers
DOI: 10.1016/j.jnoncrysol.2004.07.085
Disciplines
  • Chemistry

Abstract

Abstract A simplified mould flux glass composition used for the continuous casting of steel was synthesized and then characterized using X-ray powder diffraction (XRD) differential thermal analysis (DTA) and 19F and 29Si magic angle spinning nuclear magnetic resonance spectroscopy (MAS-NMR). DTA showed the glass to have a low glass transition temperature and to crystallize readily at 600 °C. XRD of the heat-treated glass showed it to crystallize to cuspidine. 19F MAS-NMR showed the principal fluorine species to be F–Ca( n) with no evidence of Si–F or Al–F species. Fluoride ions therefore, complex calcium in this glass, rather than forming non-bridging fluorines. The network connectivity of the glass was calculated on this basis and found to be 2.07 this would be expected to correspond to a Q 2 Si species which was supported by the 29Si data that gave a chemical shift of −78 ppm corresponding to Q 2 Si.

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