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The fraction of O atoms as non-bridging O atoms (NBO) can be well approximated based on composition alone in many silicate glasses, but the NBO preference for specific network forming cations is much less well known. Using oxygen-17 ( 17 O) NMR on low-silica calcium aluminosilicate (CAS) glasses, this study shows that Al-NBO (155 ppm) can be readily distinguished from Si-NBO (110-120 ppm), and that there is a strong preference for the latter. This study also presents a consistent equilibrium constant formulation that indicates that for thermodynamic modeling of most CAS melts with Si &gt; Al, Al-NBO are of minor importance, although they could be significant in some models of diffusion and viscosity. Al-27 one pulse NMR and analyses of spinning side bands show that AlO 5  and AlO 6  species are below detection limits (&lt;0.5%) in the low-silica (SiO 2  ≤ 20 mol%) glasses of this study (NBO/T = 0.6 to 0.8). In addition,  17 O MAS NMR does not detect any obvious (&lt;2%?) Al 3 O triclusters; hence calculations of NBO assignments can be assigned unambiguously.

Bonding preferences of non-bridging O atoms: Evidence from 17 O MAS and 3QMAS NMR on calcium aluminate and low-silica Ca-aluminosilicate glasses