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Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy (Articolo in rivista)

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Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy (Articolo in rivista) (literal)

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Maurizio, C; D'Acapito, F; Ghibaudo, E; Broquin, JE (2008)
Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy
in Journal of non-crystalline solids
(literal)

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\"[Maurizio, C.; D'Acapito, F.] European Synchrotron Radiat Facil, CNR Gilda CRG, INFM, F-38043 Grenoble, France; [Ghibaudo, E.; Broquin, J. E.] CNRS, UJF, INPG, IMEP, F-38016 Grenoble, France (literal)

Titolo

Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy (literal)

Abstract

We present a first experimental investigation on the Tl site in Tl-doped borosilicate glass by Tl/Na ion-exchange process. The local order around Tl was investigated by the EXAFS spectroscopy on a set of different samples, obtained by varying the composition of the molten salt bath (TlNO3/NaNO3 molar ratio from 0.001 to 0.4) and the bath temperature (between 350 degrees C and 380 degrees C). We show that after a 1 h exchange, Tl is surrounded by O atoms in the first shell and that the Tl-O distance is sensibly shorter than both the Tl-O distance found in Tl oxides and the typical Na-O distance in a glass. When the exchange process is extended to 1 week, the measured Tl-O distance increases towards the values found in crystalline Tl oxides, suggesting a stress release during longer exchange duration. (C) 2007 Elsevier B.V. All rights reserved. (literal)

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