Hammer, Peter [UNESP]Rizzato, A. P.Pulcinelli, Sandra Helena [UNESP]Santilli, Celso Valentim [UNESP]2014-05-202014-05-202007-05-01Journal of Electron Spectroscopy and Related Phenomena. Amsterdam: Elsevier B.V., v. 156, p. 128-134, 2007.0368-2048http://hdl.handle.net/11449/38550The surface corrosion process associated with the hydrolysis of fluorozirconate glass, Z-BLAN (53ZrF(4), 20BaF(2), 20NaF, 4LaF(2), 3AlF(3)), and the corrosion protection efficiency of a nanocrystalline transparent SnO2 layer were investigated by X-ray photoelectron spectroscopy. The tin oxide film was deposited by the sol-gel dip-coating process in the presence of Tiron(R) as particle surface modifier agent. The chemical bonding structure and composition of the surface region of coated and non-coated ZBLAN were studied before water contact and after different immersion periods (5-30 min). In contrast to the effects occurring for non-coated glass, where the surface undergoes a rapid selective dissolution of the most soluble species inducing the formation of a new surface phase consisting of stable zirconium oxyfluoride, barium fluoride and lanthanum fluoride species, the results for the SnO2-coated glass showed that the hydrolytic attack induces a filling of the film nanopores by dissolved glass material and the formation of tin oxylluoride and zirconium oxyfluoride species. This process results in a modified film, which acts as a hermetic diffusion barrier protecting efficiently the glass surface. (C) 2006 Elsevier B.V. All rights reserved.128-134engX-ray photoelectron spectroscopyZBLAN glassestin-oxide filmchemical composition and structurewater corrosionArtigo10.1016/j.elspec.2006.11.013WOS:000246726300275WOS:000246726300081Acesso restrito6466841023506131997120258528696755842986818708650000-0002-3823-00500000-0002-8356-8093