On the origin of the tin hump in several float glasses

It has long been known that some commercial float glasses display an anomalous tin hump several micrometers below the glass surface at the tin bath side. The literature offers different explanations. After precise measurement of the in-depth profiles of all relevant species and also the in-depth pro...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2001-05, Vol.283 (1), p.246-249
Main Authors: Frischat, G.H, Müller-Fildebrandt, C, Heide, D.Moseler, G
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Composition
defects and impurities
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Glasses
Physics
Solid surfaces and solid-solid interfaces
Structure, analysis, properties
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:It has long been known that some commercial float glasses display an anomalous tin hump several micrometers below the glass surface at the tin bath side. The literature offers different explanations. After precise measurement of the in-depth profiles of all relevant species and also the in-depth profile of the Sn 2+/Sn 4+ ratio, a diffusion-reaction model was developed. Its main assumption is that when the oxidized glass melt enters the strongly reducing float chamber, a drastic and rapid change in the oxidation state occurs in the glass melt near its surface. The anomalous tin hump follows then as an interaction between the ongoing diffusion processes and redox reactions, at a position identical with that of the maximum in the Sn 4+ profile.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(01)00491-4