Helium Migration in Glass-Forming Oxides
- 1 July 1972
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 43 (7) , 3068-3072
- https://doi.org/10.1063/1.1661661
Abstract
Permeation, diffusion, and solubility of helium in vitreous B2O3, SiO2, and GeO2 have been measured. The permeability and diffusivity decrease in the order B2O3>SiO2>GeO2, whereas the solubility decreases in the order SiO2>B2O3>GeO2. Differences in the activation energy for diffusion between vitreous SiO2 and GeO2 are due to the greater strain energy necessary to distort the GeO2 structure sufficiently to allow passage of a helium atom from one interstice to another. Changes in the frequency factor for diffusion appear to be primarily related to the activation entropy. The solubility appears to be a function of the distribution of interstice sizes, but cannot be predicted by present techniques.This publication has 10 references indexed in Scilit:
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