Characterization of tin at the surface of float glass

Citation
Kfe. Williams et al., Characterization of tin at the surface of float glass, J NON-CRYST, 242(2-3), 1998, pp. 183-188
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF NON-CRYSTALLINE SOLIDS
ISSN journal
0022-3093 → ACNP
Volume
242
Issue
2-3
Year of publication
1998
Pages
183 - 188
Database
ISI
SICI code
0022-3093(199812)242:2-3<183:COTATS>2.0.ZU;2-H
Abstract
Transmission Mossbauer spectroscopy (TMS) and conversion electron Mossbauer spectroscopy (CEMS) have been used to obtain spectra of Sn-119 in three co mmercially produced soda-lime-silica float glasses. Measurements have been made of the f-factor of both tin oxidation states from a series of results at temperatures between 290 and 13 K. TM spectra yielded data on the whole tin layer, which extends to a depth of about 20 mu m, while CEM spectra gav e information on the near-surface region with a depth of about 2 mu m. The isomer shift and quadrupole splitting of Sn4+ in the near-surface were high er than the shift and splitting measured for the whole region, and the Deby e temperature, theta(D), was found to be significantly less in the surface than in the full depth containing tin, showing that it was less tightly bou nd. The shift, splitting and Debye temperature of Sn2+ remained the same th roughout the glass surface within experimental errors. These results are di scussed in terms of the conditions of the float process and differences in the coordination number of Sn4+. (C) 1998 Published by Elsevier Science B.V . All rights reserved.