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Effect of Alkali Oxides on the Diffusion of Helium in a Simple Borosilicate Glass
Author(s) -
ALTEMOSE V. O.
Publication year - 1973
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1972.tb13446.x-i1
Subject(s) - borosilicate glass , alkali metal , thermal diffusivity , diffusion , permeation , helium , activation energy , ion , base (topology) , inorganic chemistry , materials science , chemistry , analytical chemistry (journal) , caesium , oxide , thermodynamics , composite material , metallurgy , chromatography , membrane , organic chemistry , mathematical analysis , biochemistry , physics , mathematics
Helium permeation rates, diffusivities, and solubilities in a simple borosilicate glass containing alkali oxides were measured. The major effect of increasing Na 2 O content from 2 to 13 mol% is a systematic decrease in permeation rate and diffusivity, indicating that the Na + ion is essentially filling space in the glass network. At 7 mol% alkali oxide, as the alkali‐ion size is increased, the changes in diffusivity and activation energy indicate that from Li + to Na + to K + , the larger ion more effectively plugs the network interstices. The size distribution of interstices in the base‐glass network is such that ions larger than K + are too large to simply fill the network and consequently tend to spread the network as well.