Ion exchange between glass melts of the system Na2ORb2OSiO2 |
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Authors: | K Herr GH Frischat |
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Institution: | Arbeitsgruppe Glas, Lehrstuhl für Glas und Keramik, Technische Universität Clausthal, FRG |
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Abstract: | Ion exchange between glass melts of the quasi-binary system Na2O · 3SiO2Rb2O2 was investigated at 700—1300°C by means of a special capillary method. Concentration profiles were obtained by electron microprobe analysis and were evaluated for a concentration-dependent quasi-binary interdiffusion coefficient using a modified Boltzmann-Matano method. At 700–1000°C interdiffusion could be obtained in pure form with values ranging from about 10?7 ?5 × 10?6 cm2 s?1. Above 1000°C convection processes superimposed interdiffusion, making a further evaluation impossible. The data are compared with those from a 0g rocket experiment and are discussed with respect to a mixed-alkali effect and in terms of the Nernst-Planck diffusion model. |
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