Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 354, Issue 2-9, Pages 480-485Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2007.07.078
Keywords
radiation effects; borosilicates; silicates; radiation; electron spin resonance; X-ray absorption
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Borosilicate and disilicate glasses doped with 0-2 mol% of TiO2 have been irradiated with 2 MeV electrons. Reduction of Ti4+ is attested by the presence of an intense electronic paramagnetic resonance (EPR) signal around g = 1.92 corresponding to Ti3+, not observed in samples that were not irradiated. Moreover, two distinct sites of Ti3+ have been detected in each glass composition. Ti-K-edge X-ray absorption near edge structure (XANES) experiment and more precisely the pre-edge analysis of non-irradiated samples indicates the presence of four, five and six coordinated Ti(IV) in borosilicate glass compositions. In contrast, the average Ti(IV) coordination in DS composition is a mixture between fivefold and sixfold. In irradiated glasses, the Ti-K-edge energy (as well as the pre-edge position) shows a shift to smaller energies, which we suggest is caused by Ti3+. Comparison between EPR, Raman and XANES results in a coherent description of Ti4+ reduction process in the glass samples. (C) 2007 Elsevier B.V. All rights reserved.
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