Abstract
Raman spectra of PbO-SiO2 slags have been measured. They are characterized by some peaks due to the Pb-O vibrational mode in a frequency region of less than 2×104 m−1 and also by a large broad band due to Si-O stretching in the frequency region of 8×104 to 12×104 m−1. By comparing with the infrared dielectric constant (ε″) obtained from the Kramers-Kronig analysis of reflectance of PbO-SiO2 slags, it is deduced that the band consists of five peaks near 8.9×104, 9.2×104, 9.6×104, 10.3×104 and 11.5×104 m−1. Furthermore, a comparison with the Raman and infrared absorption spectra of crystalline silicates suggests that these five peaks will arise from the SiO4 tetrahedron with four, three, two, one non-bridged oxygens and with four bridged oxygens, respectively. Accordingly, the distributions of three kinds of oxygens, i.e. bridged oxygen (O0), non-bridged oxygen (O−) and free oxygen (O2−), have been caluculated from the analysis of area intensities of these five peaks. The results are in agreemet with the results of thermodynamical models.
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