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A STRUCTURAL INVESTIGATION OF HIGH ALUMINA GLASSES IN THE CAO-AL2O3-SIO2 SYSTEM VIA RAMAN AND MAGIC ANGLE SPINNING NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY
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UNSPECIFIED (1991) A STRUCTURAL INVESTIGATION OF HIGH ALUMINA GLASSES IN THE CAO-AL2O3-SIO2 SYSTEM VIA RAMAN AND MAGIC ANGLE SPINNING NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY. PHYSICS AND CHEMISTRY OF GLASSES, 32 (4). pp. 149-156. ISSN 0031-9090.
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Abstract
Calcium aluminosilicate glasses with compositions CaO:Al2O3 = 1 and CaO:Al2O3 < 1 were studied. Spectra for samples along the join CaO:Al2O3 = 1 are in agreement with previous conclusions of a framework structure based on corner shared AlO4 and SiO4 tetrahedra. For samples with CaO:Al2O3 < 1, the Raman spectra show a loss of band structure, suggesting extreme coordination disorder. From Al-27 nuclear magnetic resonance spectroscopy, as the CaO:Al2O3 ratio was decreased from the 1:1 join, aluminium was observed in fourfold, fivefold, and sixfold coordination. The spin speed dependence of the peak corresponding to aluminium in fivefold coordination is demonstrated for two samples. Mean quadrupolar coupling constants and mean isotropic peak positions have been estimated.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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| Journal or Publication Title: | PHYSICS AND CHEMISTRY OF GLASSES | ||||
| Publisher: | SOC GLASS TECHNOLOGY | ||||
| ISSN: | 0031-9090 | ||||
| Official Date: | August 1991 | ||||
| Dates: |
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| Volume: | 32 | ||||
| Number: | 4 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | pp. 149-156 | ||||
| Publication Status: | Published |
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