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Atomic structure of beryllium boroaluminate glasses: A multi-nuclear NMR spectroscopic study |
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| Authors: | S. Sen P. Yu B.Z. Pevzner |
| Affiliation: | a Department of Chemical Engineering and Materials Science, University of California, One Shields Avenue, Davis, CA 95616, USA b Solid State NMR Facility, University of California, Davis, CA 95616, USA c Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Science, Nab. Makarova 2, St. Petersburg 199034, Russia d Laboratory of Glass Properties, ul. Varshavskaya, 5A, St. Petersburg 196084, Russia |
| Abstract: | The short-range structure and network speciation have been studied in a series of beryllium boroaluminate glasses using 11B, 27Al and 9Be NMR spectroscopy. All glasses are characterized by a coexistence of BeO4, BO3, BO4, AlO4, AlO5 and AlO6 species. The concentrations of BO3, AlO5 and AlO6 species in these glasses are significantly higher and the geometry of the B-O and Al-O coordination polyhedra are unusually disordered compared to those in other alkali and alkaline-earth boroaluminate glasses reported previously in the literature. These results indicate that Be atoms may not play the typical role of a network-modifying cation in these glasses. This structural scenario is consistent with the highest field strength and electronegativity of Be among all alkali and alkaline-earth metals. |
| Keywords: | 61.43.Fs 61.43.&minus j 61.05.Qr |
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