Abstract
The SiKβ X-ray emission spectra of silicate and aluminosilicate glasses and crystals have been measured with an X-ray fluorescence spectrometer and the chemical shifts of the SiKβ peak relative to that of SiO2 glass have been determined. Trends in the chemical shift of the SiKβ peak for Na2O-SiO2, Li2O-SiO2 and Li2O-Al2O3-SiO2 glasses were similar to those of their crystalline counterparts, indicating that the strength of the Si-O bond varies in the same way with composition in both glass and crystal. The chemical shift in alkali aluminosilicate glasses containing equal molar proportions of aluminium oxide and alkali oxide increased with decreasing SiO2 content, indicating that the Si-O bond also weakened in aluminosilicate glasses. The same effect was also observed when zirconia was added. The SiKβ bandwidths for Na2O-Al2O3-SiO2 and Li2O-Al2O3-SiO2 glasses with the Al2O3: M2O ratio equal to one, remained almost the same as for SiO2 glass, indicating that the addition of alkali does not result in the formation of non-bridging oxygens in the framework if accompanied by Al2O3.
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