BONDING PREFERENCES OF NON-BRIDGING O ATOMS: EVIDENCE FROM 17O MAS AND 3QMAS NMR ON CALCIUM ALUMINATE AND LOW-SILICA CA-ALUMINOSILICATE GLASSES
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dc.contributor.author | Allwardt J.R. | |
dc.contributor.author | Lee S.K. | |
dc.contributor.author | Stebbins J.F. | |
dc.date.accessioned | 2022-01-02T07:44:06Z | |
dc.date.available | 2022-01-02T07:44:06Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=7593645 | |
dc.identifier.citation | American Mineralogist, 2003, 88, 7, 949 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34106 | |
dc.description.abstract | 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 (17O) NMR on low-silica calcium aluminosili-cate (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 pre-sents a consistent equilibrium constant formulation that indicates that for thermodynamic model-ing of most CAS melts with Si > 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 AlO5 and AlO6 species are below detection limits (<0.5%) in the low-silica (SiO2 ≤ 20 mol%) glasses of this study (NBO/T = 0.6 to 0.8). In addition, 17 O MAS NMR does not detect any obvious (<2%?) Al3O triclusters; hence calculations of NBO assign-ments can be assigned unambiguously. | |
dc.subject | ATOMS & SUBATOMIC PARTICLES | |
dc.subject | CALCIUM | |
dc.subject | MINERALOGY | |
dc.subject | GLASS & GLASSWARE INDUSTRY | |
dc.title | BONDING PREFERENCES OF NON-BRIDGING O ATOMS: EVIDENCE FROM 17O MAS AND 3QMAS NMR ON CALCIUM ALUMINATE AND LOW-SILICA CA-ALUMINOSILICATE GLASSES | |
dc.type | Статья |
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