Hydrogen diffusion in silicate glasses

Nickel particles in soda-lime-silicate glass: Preparation and magnetic properties

“…One can add that a lengthening of the induction time with decreasing temperature might also partly be responsible for the very high activation energy obtained. However, it is noteworthy that all values are comparable to those mentioned for the permeation of hydrogen in glass [31,41] and to that obtained by Estournès et al [19] in the case of the reduction of copper in a similar glass. Concerning the metal particles, their mean size decreases with decreasing treatment time and temperature.…”

“…It can be concluded that the most reliable estimation are obtained for samples treated for long times, at high temperature. Indeed, the value closest to the one deducted from the literature for a glass of similar composition of the one used here [41] is the value obtained from the slopes of the optical absorption for the samples reduced at 550°C and 600°C, namely 86.5 kJ.…”

Modifying glass surfaces via internal diffusion

“…The effect of the diffusion of gas molecules on the glass structure has been studied for other purposes 0022-3093/$ -see front matter Ó 2009 Elsevier B.V. All rights reserved. doi:10.1016/j.jnoncrysol.2009.12.004 [12][13][14][15][16][17][18][19][20][21][22]. However, to our best knowledge, the correlation between incorporation of gaseous molecules into the surface structure and cationic diffusion processes has not yet been investigated.…”

“…Generally, hydrogen is able to dissolve in interstices or atomic-sized holes in silicate glasses [27]. Furthermore, hydrogen is able to reduce polyvalent ions from the higher valence state to the lower valence state, and itself become a proton in the form of hydroxyl [12][13][14][15][16][17]28,29]. Fig.…”

Surface-luminescence from thermally reduced bismuth-doped sodium aluminosilicate glasses

“…Heat-treatment of bismuth-doped glasses in a reducing atmosphere is thus a potential approach for manipulating the bismuth oxidation state and consequently the NIR luminescence. It should be noted, though, that the thermal reduction may influence the optical properties differently in different matrix materials and process conditions, especially when metallic particles are created [4,35,36]. In addition to affecting the redox state of the material's surface, such heat-treatments of glasses containing polyvalent ions can also induce ionic diffusion in the glass surface layer [37].…”