Raman Spectroscopic Study on the Structure of Silicate Slags

AbstractA Raman spectral study has been carried out on the structure of the glassy and molten states of the binary silicates, Li2O-SiO2, Na2O-SiO2, K2O-SiO2, CaO-SiO2, SrO-SiO2 and BaO-SiO2.An argon-ion laser beam of 4880 A has been used as an exciting light for the glassy state and 4579 A for the molten state. New discrete Raman lines have been observed clearly in the quenched glassy samples. These spectra are compared with those measured in the crystallized stoichiometric silicates. The spectra of the glassy state exhibit four different peaks in the Raman shifts between 850 and 1100 cm−1 corresponding to the number of non-bridging oxygens for each silica tetrahedron unit. For the first time, these results give evidence for the coexistence of four different types of non-bridging oxygens, thus disproving the hitherto accepted concept that non-bridging oxygens are regarded as single O− -ion alone.Raman spectra of the alkali silicate systems, Li2O-SiO2, Na2O-SiO2 and K2O-SiO2, have been measured below and a...

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