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Titanium coordination in silicate glasses investigated using O K-edge X-ray absorption spectroscopy

Published online by Cambridge University Press:  05 July 2018

G. S. Henderson ,
Xiaoyang Liu  and
M. E. Fleet
G. S. Henderson*
Affiliation:
Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada
Xiaoyang Liu
Affiliation:
Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
M. E. Fleet
Affiliation:
Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
*
* E-mail: [email protected]
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Abstract

A series of titanium silicate glasses along the composition joins TiO2-SiO2, TiO2-Na2SiO3, TiO2-K2SiO3 and TiO2-CaSiO3, has been examined using oxygen K-edge X-ray absorption near edge structure spectroscopy (XANES) confined to the near-surface region. Sharp pre-edge features in the spectra can be used to determine the Ti coordination in the glasses. The presence of [4]Ti is indicated by a pre-edge peak at ∼534 eV while [5]Ti is indicated by a peak at ∼533 eV. Titanium exists in all these glasses as [4]Ti and [5]Ti with no [6]Ti being present. For alkali-containing glasses the [5]Ti site becomes more prevalent with increasing TiO2. TiO2-K2SiO3 compositions contain a greater proportion of [4]Ti than comparable Na2O compositions. This is consistent with earlier Ti L-edge findings. The TEY spectra for the TiO2-CaSiO3 compositions indicate the presence of significant amounts of [5]Ti at high TiO2 contents; however, comparison of TEY (near surface) and FY (bulk sample) XANES shows that the [5]Ti is confined to the surface of the glass sample with the bulk of the glass containing [4]Ti.

Keywords

TiXANESsilicate glasses.
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 4 , August 2003 , pp. 597 - 607
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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