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Helium migration in lithium aluminosilicate glasses

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1 Author(s)
Shelby, J.E. ; Sandia Laboratories, Livermore, California 94550

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Helium permeation, diffusion, and solubility have been measured for a number of lithium silicate and aluminosilicate glasses. Helium mobility in the lithium silicate glasses is controlled by the two‐phase morphology of these glasses. Addition of as little as 2 mol% alumina strongly suppresses the tendency toward phase separation, i.e., yields homogeneous glasses. The compositional dependence of helium mobility in these glasses indicates that a major change in the glass structure occurs when the alumina‐to‐lithia ratio exceeds unity. Comparison of these results to those for analogous sodium aluminosilicates indicates that lithium has a greater effect than sodium on the free volume of the glass.

Published in:

Journal of Applied Physics  (Volume:48 ,  Issue: 4 )

Date of Publication:

Apr 1977

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