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The structure of TiO2-SiO2 and CaO-SiO2 sol-gel glasses from neutron diffraction and solid state NMR using isotopic enrichment of titanium, calcium and oxygen
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UNSPECIFIED (2005) The structure of TiO2-SiO2 and CaO-SiO2 sol-gel glasses from neutron diffraction and solid state NMR using isotopic enrichment of titanium, calcium and oxygen. In: 9th International Conference on the Structure of Non-Crystalline Materials (NCM9), Alfred Univ, Corning, NY, JUL 11-15, 2004. Published in: PHYSICS AND CHEMISTRY OF GLASSES, 46 (4). pp. 433-438. ISSN 0031-9090.
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Abstract
An advanced materials characterisation methodology has been used to examine systematically a range of sol-gel glass materials of contemporary interest. Neutron diffraction using Ti-46 and Ti-48 stable isotopes, and isotope-enriched O-17 MAS NMR, have been used to characterise the structure of catalytically active (TiO2)(x)(SiO2)(1-x) sol-gel glass as a function of calcination temperature (T=250, 500 and 750 degrees C). The results reveal directly two Ti-O distances in a homogeneous (TiO2)(0.18)(SiO2)(0.82) sol-gel derived glass. The detailed nature of the Ti environment may be discerned from a combination of neutron scattering data with solid state NAIR, including the possible presence of phase separation at the higher temperature. Neutron diffraction Using Ca-44, and isotope enriched O-17 MAS NMR have also been used to study the detailed nature of the structure of CaO-SiO2 bioactive sol-gel glasses. The results offer a direct observation of multiple Ca-O distances in this material, and pave the way to a fuller understanding of the role of Ca in its bioactivity. The results presented here are consistent with, but greatly extend our previous XRD, O-17 and Si-29 MAS-NMR, XANES and EXAFS studies of these materials.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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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 2005 | ||||
Dates: |
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Volume: | 46 | ||||
Number: | 4 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 433-438 | ||||
Publication Status: | Published | ||||
Title of Event: | 9th International Conference on the Structure of Non-Crystalline Materials (NCM9) | ||||
Location of Event: | Alfred Univ, Corning, NY | ||||
Date(s) of Event: | JUL 11-15, 2004 |
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