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Proceedings Paper

Hydrogen-induced absorption in glasses containing arsenic and antimony
Author(s): Michelle R. Tuzzolo; Jeffrey T. Kohli; James E. Shelby
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Paper Abstract

Borosilicate, potassium and sodium silicate and potassium borate glasses containing small quantities of AsO3 and 5½03 darken from the surface when exposed to H2 in the glass transformation range. The depth of surface darkening is a function of time, temperature, and H2 pressure. Change in absorbance at constant wavelength increases with time but shows neither linear nor square root dependence on time. In addition, the absorbance change (X constant) does not show Arrhenius behavior as a function of treatment temperature, but instead appears to approach saturation. The same phenomena are observed for D2 treatments. Absorbance change at 300 nm from the H2 treated sample under identical temperature and pressure conditions differs by a factor of the square root of 2. Relative permeability of H2 and D2 is given by the square root of their mass ratio, i.e. 12. This finding suggests a direct proportionality between the inducedabsorption and the permeability of the diffusing species. The coloration is attributed to the reduction of the fining agent (As/Sb) and is accompanied by an increase in the hydroxyl concentration in the glass. The effect of base glass permeability, fining agent identity and fming agent concentration on the optical absorption will be discussed. Metallic colloidal scattering is proposed as the mechanism for the coloration. Evidence to support the mechanism is presented and discussed.

Paper Details

Date Published: 1 October 1990
PDF: 8 pages
Proc. SPIE 1327, Properties and Characteristics of Optical Glass II, (1 October 1990); doi: 10.1117/12.22513
Show Author Affiliations
Michelle R. Tuzzolo, New York State College of Ceramics/Alfred Univ. (United States)
Jeffrey T. Kohli, New York State College of Ceramics/Alfred Univ. (United States)
James E. Shelby, New York State College of Ceramics/Alfred Univ. (United States)


Published in SPIE Proceedings Vol. 1327:
Properties and Characteristics of Optical Glass II
Alexander J. Marker, Editor(s)

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