Effects of the degree of polymerization on the structure of sodium silicate and aluminosilicate glasses and melts: An 17O NMR study

Na2O solubility in CaO–MgO–SiO2 melts

“…The activity coefficient of Na 2 O confirms the non-ideal behavior of the Na 2 O solubility in CMS melts; the non-linearity of this relationship suggesting a complex influence of liquid composition on Na 2 O-activity coefficient (see also Rego et al, 1988;Pak et al, 1989;Allendorf and Spear, 2001;Lee and Stebbins, 2009).…”

High-resolution solid-state NMR study of the effect of composition on network connectivity and structural disorder in multi-component glasses in the diopside and jadeite join: Implications for structure of andesitic melts

“…5, open square) is not observed: Na-O-Si peak position is well-defined in the 2D NMR spectra and it does not have strong composition dependence Lee and Stebbins, 2003). Additionally Na-O-Si and Si-O-Al peaks are relatively well-resolved in 17 O 3QMAS NMR spectrum (Lee and Stebbins, 2009). If more than 2-3% of Na-O-Si would exist in jadeite glass, Na-O-Si peak could have been observed.…”

27Al NMR Studies of Aluminosilicate Glasses

“…While some information has been gained by fitting the isotropic projections of 27 Al 3QMAS NMR spectra into signals from distinct Q Al n (mSi) groups [251], and 29 Si MAS NMR has also been utilized to a minor extent to probe the Al/Si intermixing [63,74], neither of the standard 29 Si and 27 Al NMR tools offers sufficient spectral resolution to address this problem accurately for AS glass networks. Currently, 17 O NMR provides superior insight: the 17 O chemical shift is a sensitive probe to distinguish the relative numbers of Al/Si atoms in its first coordination shell, i.e., to assess the ensemble of {T-O [2] -T 0 } motifs [64,[274][275][276][277][278]. However, it requires expensive 17 O NMR isotopic enrichment, and sometimes fails to provide sufficient resolution and/or accurate signal intensities when applied to multicomponent AS glasses.…”