Sodium Diffusion in SiO 2 Glass
Author:
- 1 September 1968
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 51 (9) , 528-530
Abstract
Diffusion of the radioactive tracer 22 Na in a commercial SiO 2 glass was investigated from 170° to 1000°C. The temperature dependence curve had discontinuities at about 573° and 250°C. The resulting Arrhenius equations are D = 3.44 × 10 2 exp(‐21.1 kcal/RT) cm 2 /sec between 1000° and 573°C, D = 0.398 exp(‐25.8 kcal/RT) cm 2 /sec between 573° and 250°C, and D = 2.13 exp(‐28.3 kcal/RT) cm 2 /sec between 250° and 170°C. The two anomalies are discussed in terms of “quartz‐like” and “cristobalite‐like” precrystalline elements in the structure of the glass. Comparison of the Na diffusion in SiO, glass with that in soda‐silica and soda‐lime‐silica glasses shows that SiO 2 glass occupies a boundary position with respect to these systems. A possible diffusion mechanism is discussed.Keywords
This publication has 4 references indexed in Scilit:
- Einflu der?-?-Quarzumwandlung auf die22Na-Diffusion in SiO2-GlasThe Science of Nature, 1967
- Diffusion of Oxygen in Fused SilicaJournal of the American Ceramic Society, 1965
- Diffusion of Oxygen in Vitreous SilicaJournal of the American Ceramic Society, 1963
- 109. The self-diffusion of lead in lead sulphideJournal of the Chemical Society (Resumed), 1946