Loading...
Please wait, while we are loading the content...
Similar Documents
Effects of CaF 2 Addition on the Structure of CaO-Al 2 O 3-SiO 2 Glasses
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tomoaki Matsuya, Shigeki Ohta, Michio |
| Copyright Year | 2008 |
| Abstract | XPS and NMR analyses were done on the CaO-Al2O3-SiO2 and CaO-Al2O3-SiO2-CaF2 glasses to investigate the effect of fluoride on the glass structure. The XPS spectra showed that most of of the fluoride combined with Ca and Al or existed as a free ion in the glasses. The number of F per Ca atom and the fraction of free Fion decreased with increasing Al/(Al+Si) ratio in the glasses with Ca/Al=0.5. The fraction of free Fion increased at high CaO content in the glasses containing about 45mol% SiO2. The chemical shift of the fluoride-containing glasses in 29Si NMR spectra was smaller than that of the non-fluoride glasses. The chemical shift of the glasses in 27Al NMR spectra also showed the same tendency as in 29Si NMR spectra. The addition of fluoride caused an increase in the average number of bridging oxygen atoms in the aluminosilicate glass network. However, the average number of Al around a SiO4 tetrahedron (n) decreased in the species, Si-(O-Si)4-n(O-Al)n. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.jstage.jst.go.jp/article/dmj1982/17/2/17_2_104/_pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
