NDLI: A Ti L-edge X-ray absorption study of Ti-silicate glasses

Content Provider	Springer Nature Link
Author	Henderson, G. S. Liu, X. Fleet, M. E.
Copyright Year	2002
Abstract	A series of titanium silicate glasses along the composition joins SiO2–TiO2, Na2SiO3–TiO2, K2SiO3–TiO2, and CaSiO3–TiO2 have been examined using titanium (Ti) L-edge X-ray absorption near-edge spectroscopy (XANES). XANES spectra were collected at the Canadian Synchrotron Radiation Facility (CSRF), University of Wisconsin, Madison, using the Spherical Grating Monochromator (SGM) beamline. Glass spectra were compared with spectra obtained from crystalline analogues with differing Ti coordination environments: βrBa2TiO4 ([4]Ti); fresnoite ([5]Ti); and rutile and anatase ([6]Ti). The Ti L-edge data indicate that for homogeneous TiO2–SiO2 glasses Ti coordination is [5]Ti at TiO2 contents below 3.6 wt% but predominantly [4]Ti with some [5]Ti present above this content. There is no evidence for [6]Ti. For the Na2 O-containing glasses the L-edge data indicate that Ti is [4]Ti with some [5]Ti at low TiO2 contents, becomes a mix of [4]Ti and [5]Ti with increasing TiO2 content, but is exclusively [5]Ti by 14.3 wt% TiO2. The K2O composition glasses exhibit similar behavior but contain a greater proportion of [4]Ti and less [5]Ti than the equivalent Na2O-bearing glasses. These findings are consistent with previous Raman and XANES pre-edge studies. Alkaline-earth-containing glasses behave somewhat differently, with [5]Ti occurring in low TiO2 content glasses, becoming a mix of [4]Ti and [5]Ti, and then gradually changing to predominantly [4]Ti at higher TiO2 compositions. Finally, we have obtained data for a fresnoite composition (Ba2TiSi2O8) glass. Previous pre-edge and Raman data had suggested that this composition glass contained [5]Ti; however, our Ti L-edge data indicate that Ti is almost exclusively [4]Ti, although some [5]Ti may also be present.
Starting Page	32
Ending Page	42
Page Count	11
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	29
Issue Number	1
e-ISSN	14322021
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-02-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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