Infrared emission spectra of CaF₂-CaO-SiO₂ melt

The infrared emission spectra of CaF₂-CaO-SiO₂ melt were investigated by a method combining infrared emission spectroscopy and the hot-filament technique. Emission for spectra related to Si-O bond can be observed by this in situ technique. The influence of SiO₂ and fluoride content on the spectrum was investigated, and the emission attributable to bonds corresponding to silicon-bridging oxygen and silicon-non bridging oxygen was discussed. Results suggest that fluoride ion dominantly substitutes for a non-bridging bond in low SiO₂ concentration region. The structure of silicate was compared with calculated infrared emission of Si-F-O.