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Seven soda-lime silicate glasses, each of which contains one of the following polyvalent metals: Fe, Mn, Cu, Ce, Ti, V, and Cr, are oxidized in air and reduced in H 2 /N 2 (1/99) at their respective glass transition temperature for some period. A crystalline oxide surface layer is created on the glasses (except the vanadium-bearing glass) under the oxidizing condition, since the metallic...
We find that inward diffusion of network-modifying cations can occur in an iron-containing silicate glass when it is heat-treated in CO/CO 2 (98/2 v/v) or H 2 /N 2 (1/99 v/v) gases at temperatures around the glass transition temperature. The inward diffusion is caused by the reduction of ferric to ferrous ions and this diffusion leads to formation of a silica-rich surface layer...
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