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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

Pickup, David M., Sowrey, Frank E., Skipper, Laura J., Newport, Robert J., Gunawidjaja, Philips N., Drake, Kieran O., Smith, Mark E., Saravanapavan, Priya, Hench, Larry L. (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. Physics and Chemistry of Glasses, 46 (4). pp. 433-438. ISSN 0031-9090. (KAR id:8225)

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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: Article
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Robert Newport
Date Deposited: 12 Jul 2008 15:23 UTC
Last Modified: 16 Nov 2021 09:46 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/8225 (The current URI for this page, for reference purposes)
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