Effects of Glass Structure on the Optical Absorption of Transition Ions in Industrial Soda-Lime-Silica Glasses

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The optical absorption due to Mn3+, Cu2+, Ni2+ and Co2+ ions in industrial soda-lime-silica glass was investigated as a function of the Na2O concentration in the range of 11-19 mol%. With increasing Na2O concentration in the experimental glasses, the calculated basicity; Λcal, increased. The 29Si NMR spectra showed a high proportion of non-bridging oxygens; NBOs as the basicity of glass was increased. The results are thought to be due to tetrahedral networks; Q4 species were disconnected by replacing the bridging oxygens; BOs with NBOs forming Q3 species. These results were confirmed by a shift and broadening of XRD peaks. The redox reactions of the Mn2+-Mn3+ and Cu+-Cu2+ couples shifted toward the more oxidized ions due to oxygen partial pressure; p(O2) during melting and the oxide ion activity; aO2- where increase with increasing glass basicity. While the Ni2+-Ni3+ and Co2+-Co3+ couples were assumed to be presented only the Ni2+ and Co2+ ions in these glasses, respectively. The optical absorption bands due to Mn3+, Cu2+, Ni2+ and Co2+ ions occurred at characteristic wavelengths with different optical densities or intensities as a function of glass basicity. The increase in the intensities of the absorption bands of these absorbing ions depended not only on the ion concentration but also on the increase of polarisability of the oxide (-II) species; αoxide(-II) surrounding the ions. This value directly affected the extinction coefficients of the ions; εion. The increase of εion is associated with increased intensity of color.

Effects of Glass Structure on the Optical Absorption of Transition Ions in Industrial Soda-Lime-Silica Glasses

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