Effects of CaF_2 Addition on the Structure of CaO-Al_2O_3-SiO_2 Glasses
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概要
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XPS and NMR analyses were done on the CaO-Al_2O_3-SiO_2 and CaO-Al_2O_3-SiO_2-CaF_2 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 F^- ion decreased with increasing Al/(Al+Si) ratio in the glasses with the Ca/Al=0.5. The fraction of free F^- ion increased at high CaO content in the glasses containing about 45 mol% SiO_2. The chemical shift of the fluoride-containing glasses in ^<29>Si NMR spectra was smaller than that of the non-fluoride glasses. The chemical shift of the glasses in ^<27>Al NMR spectra also showed the same tendency as in ^<29>Si 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 SiO_4 tetrahedron (n) decreased in the species, Si-(O-Si)_<4-n>(O-Al)_n.
著者
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Matsuya Shigeki
Department Of Biomaterials Faculty Of Dental Science Kyushu University
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Matsuya Shigeki
Department Of Dental Materials Engineering Faculty Of Dentistry Kyushu University
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Ohta Michio
Department Of Bacteriology Graduate School Of Medicine Nagoya University
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Ohta Michio
Department Of Dental Materials Engineering Faculty Of Dentistry Kyushu University
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MAEDA Tomoaki
Department of Dental Materials Engineering Faculty of Dentistry, Kyushu University
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Maeda Tomoaki
Department Of Dental Materials Engineering Faculty Of Dentistry Kyushu University
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MATSUYA Shigeki
Department of Dental Materials Engineering Faculty of Dentistry, Kyushu University
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