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Title: Direct Evidence for Trivalent Titanium in Artificially Irradiated (electrons) Oxide Glasses

Abstract

Ti-doped borosilicate and disilicate glasses were irradiated with high-energetic electrons in order to study Ti(IV) reduction processes. Reduction efficiency was actually confirmed by an important Ti(III) EPR signal around g=1.93 in irradiated samples. The Ti(III) amount increases with the irradiation dose. Moreover, the Ti(III) environment depends on the glass composition. Hence, the reduction process efficiency is strongly correlated to the Ti(IV) environment in the pristine glass. The Ti environment was analyzed by Ti K-edge XANES in order to understand the reduction mechanisms. Pre-edge analysis of non-irradiated samples indicates the presence of four, five and six coordinated tetravalent Ti sites in borosilicate glasses, whereas in disilicate the Ti(IV) coordination is a mixture between five-fold and six-fold. In irradiated samples, the Ti pre-edge shows a slight low-energy shift associated to an intensity decrease in disilicate glasses. Correlation between EPR and XANES experiments allows for interpretation of the pre-edge variation in terms of Ti(III) formation. Profiles ({mu}m resolution) were also performed to measure the proportion of Ti(III) on different points across the irradiated DS. No significant difference in XANES spectra was observed suggesting that the production of Ti(III) is homogeneous in the volume.

Authors:
; ;  [1];  [2];  [3]; ;  [4];  [5]
  1. Laboratoire des Solides Irradies, UMR 7642 CEA-CNRS-Ecole Polytechnique, Ecole Polytechnique, 91128 Palaiseau Cedex (France)
  2. USM 201 'Mineralogie-Petrologie', Museum National d'Histoire Naturelle, CNRS UMR 7160, Paris (France)
  3. (United States)
  4. CNRS- UR1 SOLEIL, Gif sur Yvette, (France)
  5. (Switzerland)
Publication Date:
OSTI Identifier:
21054672
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644580; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTRA; ABSORPTION SPECTROSCOPY; BORON SILICATES; BOROSILICATE GLASS; CORRELATIONS; DOPED MATERIALS; ELECTRON BEAMS; ELECTRON SPIN RESONANCE; IRRADIATION; PHYSICAL RADIATION EFFECTS; TAIL ELECTRONS; TITANIUM; TITANIUM COMPLEXES; VARIATIONS; X-RAY SPECTRA; X-RAY SPECTROSCOPY

Citation Formats

Ollier, Nadege, Boizot, Bruno, Lombard, Pierre, Farges, Francois, Department of Geological and Environmental Sciences, Stanford University, Flank, Anne-Marie, Lagarde, Pierre, and Swiss Light Source, Villigen. Direct Evidence for Trivalent Titanium in Artificially Irradiated (electrons) Oxide Glasses. United States: N. p., 2007. Web. doi:10.1063/1.2644580.
Ollier, Nadege, Boizot, Bruno, Lombard, Pierre, Farges, Francois, Department of Geological and Environmental Sciences, Stanford University, Flank, Anne-Marie, Lagarde, Pierre, & Swiss Light Source, Villigen. Direct Evidence for Trivalent Titanium in Artificially Irradiated (electrons) Oxide Glasses. United States. doi:10.1063/1.2644580.
Ollier, Nadege, Boizot, Bruno, Lombard, Pierre, Farges, Francois, Department of Geological and Environmental Sciences, Stanford University, Flank, Anne-Marie, Lagarde, Pierre, and Swiss Light Source, Villigen. Fri . "Direct Evidence for Trivalent Titanium in Artificially Irradiated (electrons) Oxide Glasses". United States. doi:10.1063/1.2644580.
@article{osti_21054672,
title = {Direct Evidence for Trivalent Titanium in Artificially Irradiated (electrons) Oxide Glasses},
author = {Ollier, Nadege and Boizot, Bruno and Lombard, Pierre and Farges, Francois and Department of Geological and Environmental Sciences, Stanford University and Flank, Anne-Marie and Lagarde, Pierre and Swiss Light Source, Villigen},
abstractNote = {Ti-doped borosilicate and disilicate glasses were irradiated with high-energetic electrons in order to study Ti(IV) reduction processes. Reduction efficiency was actually confirmed by an important Ti(III) EPR signal around g=1.93 in irradiated samples. The Ti(III) amount increases with the irradiation dose. Moreover, the Ti(III) environment depends on the glass composition. Hence, the reduction process efficiency is strongly correlated to the Ti(IV) environment in the pristine glass. The Ti environment was analyzed by Ti K-edge XANES in order to understand the reduction mechanisms. Pre-edge analysis of non-irradiated samples indicates the presence of four, five and six coordinated tetravalent Ti sites in borosilicate glasses, whereas in disilicate the Ti(IV) coordination is a mixture between five-fold and six-fold. In irradiated samples, the Ti pre-edge shows a slight low-energy shift associated to an intensity decrease in disilicate glasses. Correlation between EPR and XANES experiments allows for interpretation of the pre-edge variation in terms of Ti(III) formation. Profiles ({mu}m resolution) were also performed to measure the proportion of Ti(III) on different points across the irradiated DS. No significant difference in XANES spectra was observed suggesting that the production of Ti(III) is homogeneous in the volume.},
doi = {10.1063/1.2644580},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}