| タイトル | Raman and Infrared Spectroscopy of Yttrium Aluminum Borate Glasses and Glass-ceramics |
| 著者（英） | Bradley, J.; Brooks, M.; Morris, A.; Morgan, S.; Crenshaw, T.; Chattopadhyay, K. |
| 著者所属（英） | Fisk Univ. |
| 発行日 | 1998-02-22 |
| 言語 | eng |
| 内容記述 | Raman spectra of glasses and glass-ceramics in the Y2O3-Al2O3-B2O3 system are reported. Glasses with B2O3 contents ranging from 40 to 60 mole percent were prepared by melting 20 g of the appropriate oxide or carbonate powders in alumina crucibles at 1400 C for 45 minutes. Subsequent heat treatments of the glasses at temperatures ranging from 600 to 800 C were performed in order to induce nucleation and crystallization. It was found that Na2CO3 added to the melt served as a nucleating agent and resulted in uniform bulk crystallization. The Raman spectra of the glasses are interpreted primarily in terms of vibrations of boron - oxygen structural groups. Comparison of the Raman spectra of the glass-ceramic samples with spectra of aluminate and borate crystalline materials reveal that these glasses crystallize primarily as yttrium aluminum borate, YAl3(BO3)4. |
| NASA分類 | Inorganic, Organic and Physical Chemistry |
| レポートNO | 98URC138 |
| 権利 | No Copyright |
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