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Sodium Diffusion in Glass: I, Single‐Alkali Silicate
Author(s) -
LIM CHUNG,
DAY DELBERT E.
Publication year - 1977
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.1151-2916.1977.tb14105.x
Subject(s) - alkali metal , ion , diffusion , silicate glass , silicate , vacancy defect , sodium , materials science , analytical chemistry (journal) , sodium silicate , inorganic chemistry , chemistry , mineralogy , crystallography , thermodynamics , metallurgy , physics , organic chemistry , chromatography
The isotope effect for 22 Na/ 24 Na diffusion was measured for three 25‐mol% alkali‐silicate glasses. A multiple diffusion mechanism wherein the Na ions diffuse both singly (vacancy mechanism) and in pairs (interstitialcy mechanism) provided the best agreement with the experimental data. According to this tentative model, diffusion by Na ion pairs predominates at low temperatures, and the fraction of Na ions diffusing singly increases with increasing temperature. In the glasses investigated, nearly all of the Na ions diffuse singly in the vicinity of the transformation range.