Temperature and hydroxyl concentration dependences of diffusion coefficients of hydroxyl groups in vitreous silica at temperatures of 850–1200 °C
| Autor: | Yu Arakawa, Nobu Kuzuu, Naohiro Horii, Hideharu Horikoshi, Naoya Sato |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Physics and Astronomy (miscellaneous) Silica glass Chemistry Diffusion Inorganic chemistry General Engineering Analytical chemistry General Physics and Astronomy 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences 0103 physical sciences Empirical formula Effective diffusion coefficient 0210 nano-technology Absolute zero Water vapor |
| Zdroj: | Japanese Journal of Applied Physics. 56:111303 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.7567/jjap.56.111303 |
| Popis: | The hydroxyl concentration and temperature dependences of the diffusion coefficients of hydroxyl groups in vitreous silica were investigated by analyzing the change in the hydroxyl concentration distribution caused by heat treatment around the binding interface between silica glass plates with different hydroxyl concentrations. We confirmed experimentally that the diffusion coefficient is proportional to the hydroxyl concentration, which had been predicted theoretically, and obtained the empirical formula D(c OH) = [(4.9 ± 1.0) × 10−14 m2/swt ppm] × exp[−(8.1 ± 0.3) × 103 K/T] c OH with the hydroxyl concentration c OH and the absolute temperature T, which is valid at least in the temperature range of 850–1200 °C. Using the values calculated using this formula, we can reproduce the hydroxyl concentration profile after diffusion from a silica glass surface induced by heating in a water vapor atmosphere in the literature, which supports the validity of the empirical formula obtained in this study. The relationship between the effective diffusion coefficient in the literature and our result is discussed. |
| Databáze: | OpenAIRE |
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