Fig 1.
Simplified structure of a ternary sodium-aluminosilicate glass.
Roles of Na are as follows: those acting as charge compensators are labeled “C;” those in the immediate vicinity of non-bridging oxygen atoms act as network modifiers; those in the immediate vicinity of free oxygen exist as free oxide. The Si species are depicted in Qn form, where n (0 ≤ n ≤ 4) represents the number of bridging oxygen atoms around the silicon atom as the nearest neighbors.
Fig 2.
Raman spectra of Na-Mg aluminosilicate glasses.
The value of x in the notation Gx reflects the MgO content as defined in section 2.2.
Fig 3.
(A) Deconvolution of Raman spectra for glasses G0.00. (B) Deconvolution of Raman spectra for glasses G0.33. (C) Qn distribution plot for glasses.
Fig 4.
(A) XANES spectra at Si K-edge of Na-Mg aluminosilicate glasses; (B) first derivative of XANES spectra, with the energy corresponding to the maximum in the derivative marked for each sample; (C) FWHM plot for Si K-edge.; (D) Fourier transform (radial distance) of Si-Kedge EXAFS spectra.
Fig 5.
Results of alkaline solubility of (A) silicon and (B) aluminum. Results are expressed as the weight percentage of the respective elements that dissolved during the solubility tests, relative to their amounts in the original glasses.
Fig 6.
XRD results for the glasses (labeled as Gx) and the solid residues (labeled as RGx) remaining after their alkaline solubility tests.
Fig 7.
STEM dark field images along with elemental mapping for the glasses (labeled Gx) and the solid residues (labeled RGx) remaining after their alkaline solubility tests.
Fig 8.
NBO/T and optical basicity of glasses.
Fig 9.
Influence of polymerization and optical basicity on reactivity of Na-Mg aluminosilicate glasses.