Effect of water incorporation on the diffusion of sodium in an alkaline-earth boroaluminosilicate glass

Incorporation of water into glasses and its influence on the diffusion of cations, including the creation of diffusion barriers

“…Case A residual radioactivity profiles were observed for the diffusion of Na-22 in as-received Type I silica glass (Infrasil 302) diffusion-annealed at temperatures between 400 and 700°C in common air [7] and in as-received alkaline-earth boroaluminosilicate glass, Corning Code 1737, diffusion-annealed in common air at temperatures between 500 and 800°C [8,9]. Examples for such profiles are shown in Fig.…”

“…From previous studies related to the diffusion of sodium in a Type I silica glass, Infrasil 302 [7], and in an alkalineearth boroaluminosilicate glass, Corning Code 1737 [8], it is known that these glasses incorporate water when annealed at elevated temperatures in moist atmospheres. Details about the two glasses denoted above, including their chemical compositions, impurity levels and strain points, can be found in Refs.…”

“…Details about the two glasses denoted above, including their chemical compositions, impurity levels and strain points, can be found in Refs. [7][8][9]. To verify that the glasses denoted above take up water during high temperature annealing, glass samples were annealed for different times in moist air.…”

“…To verify that the glasses denoted above take up water during high temperature annealing, glass samples were annealed for different times in moist air. For Type I silica glass, the water uptake was studied at 1000°C in common air and in air saturated with water at 80°C [7] and for the alkaline-earth boroaluminosilicate glass denoted above in air saturated with water at 80°C at 650, 700 and 800°C [8]. Fig.…”

“…3. Examples for Case A residual radioactivity profiles observed for the diffusion of Na-22: (a) in an as-received Type I silica glass sample diffusionannealed at 650°C in common air [7], and (b) in a sample of the earth-alkaline boroaluminosilicate glass Corning Code 1737 diffusion-annealed at 650°C in common air [8]. If D ns = D bu , Eqs.…”