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Author: Dersch, Oliver × Publisher: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft ×

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Now showing 1 - 3 of 3
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    Practical IR extinction coefficients for water in commercial glasses determined by nuclear reaction analysis
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2000) Ilievski, Stamenko; Dersch, Oliver; Kinkel, Stefan; Maldener, Joachim; Zouine, Abdelkader; Rauch, Friedrich; Haspel, Rainer; Krämer, Fritz W.
    For a number of commercial glasses with different chemical compositions the water contents were determined by nuclear reaction analysis (NRA) measurements. These results were used to deduce practical extinction coefficients by comparison with the measured IR absorbance values at 2.8 μm. For aluminosilicate and television glasses the practical molar extinction coefficients are given for the first time. Practical extinction coefficients are dependent upon glass composition. With increasing basicity of the glasses studied they decrease from 182 to 24 l/(mol cm).
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    Determination of the water content of alkali lime silica glasses by IR spectroscopy using nuclear reaction analysis for calibration
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1998) Harder, Ulrike; Geißler, Heinz; Gaber, Martin; Hähnert, Manfred; Dersch, Oliver; Rauch, Friedrich
    Systematic IR and NRA investigations were performed for two series of glasses with very different water contents. The glasses had the composition (in mol%): 16 R₂O · 10 CaO · 74 SiO₂ (R = sodium, potassium). The IR absorption coefTicients of the OH bands were found to be linearly correlated with the total hydrogen content obtained by the NRA measurements. Using the hydrogen concentration values from NRA, the total water contents were calculated and so-called practical IR extinction coefTicients were deduced. The values found for the soda-lime-silica glasses are 381 · mol¯¹ · cm¯¹ for the band at 3550cm¯¹ and 561 · mol¯¹ · cm¯¹ for the band at 2800cm¯¹. The values for the potassium-lime-silica glasses are 231 · mol¯¹ · cm¯¹ for the band at 3550 cm¯¹ and 78 l · mol¯¹ · cm¯¹ for the band at 2800 cm¯¹ Also, Scholze's two-band method was applied, resulting in good agreement between the water contents of the glasses derived from the IR and the NRA measurements.
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    Hydrogen/lithium interdiffusion in a lithium aluminosilicate glass studied by NRA and RBS
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Dersch, Oliver; Laube, Michael; Rauch, Friedrich; Becker, Otmar
    Samples of a lithium aluminosilicate (LAS) glass, a model glass for technical LAS glass used in the production of glass ceramics, were treated in hot sulfuric acid and analyzed using Nuclear Reaction Analysis (NRA) techniques for determining hydrogen and lithium depth profiles in the surface layer. It was found that the depth profiles of these two elements are fully complementary, showing that H⁺/Li⁺ ion exchange takes place during the treatment. As revealed by Rutherford Backscattering Spectrometry (RBS) measurements the other glass constituents were not affected by the treatment.