Helium migration in lithium aluminosilicate glasses

Autor:	J. E. Shelby
Rok vydání:	1977
Předmět:	Aluminium oxides Materials science Diffusion Sodium Inorganic chemistry General Physics and Astronomy chemistry.chemical_element Silicate chemistry.chemical_compound chemistry Aluminosilicate Lithium Solubility Helium
Zdroj:	Journal of Applied Physics. 48:1497-1502
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.323868
Popis:	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.
Databáze:	OpenAIRE
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