Redox reactions and inward cationic diffusion in glasses caused by CO and H2 gases

@inproceedings{Smedskjr2009RedoxRA,
  title={Redox reactions and inward cationic diffusion in glasses caused by CO and H2 gases},
  author={Morten Mattrup Smedskj{\ae}r and Yuanzheng Yue},
  year={2009}
}
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… CONTINUE READING