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- W1997208565 abstract "Abstract 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 with a thickness of 200–600 nm. The diffusion coefficients of the network-modifying divalent cations are calculated and they are different for the glasses treated in the CO and H 2 gases. At the applied partial pressures of CO and H 2 , the H 2 -bearing gas creates the silica-rich layer more effectively than the CO-bearing gas. The layer increases the hardness and chemical durability of the glass due to the silica network structure in the surface layer." @default.
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- W1997208565 date "2009-07-16" @default.
- W1997208565 modified "2023-09-23" @default.
- W1997208565 title "Redox reactions and inward cationic diffusion in glasses caused by CO and H2 gases" @default.
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- W1997208565 doi "https://doi.org/10.1016/j.ssi.2009.05.009" @default.
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