日本金属学会誌

J. Japan Inst. Metals, Vol. 43, No. 12 (1979),
pp. 1138-1144

Structural Study of PbO-SiO2 Slags by Raman Spectroscopy

Nobuya Iwamoto1, Yoshiaki Tsunawaki2 and Makoto Miyago3

1Welding Research Institute, Osaka University, Suita
2Welding Research Institute, Osaka University, Suita. Present address: Department of Chemistry, Osaka Industrial University, Daito
3Graduate School, Osaka University, Suita. Present address: Alps Electric Company, Iwaki

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.


(Received 1979/04/17)

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