Abstract
NaF-AlF 3-CaF 2 molten mixtures have been investigated by Raman spectroscopy. In good agreement with the phase diagram, the conductivity and some vapour pressure measurements, it shows unequivocally that CaF 2 behaves as a fluoride donor, more in acidic than in cryolite NaF-AlF 3 baths. This behaviour fades, however, if the mixture becomes more basic. Quantitative analysis of the CaF 2 addition effect on NaF-AlF 3 spectra was performed using a band deconvolution method. It allowed the determination of the overall solvent acidity change involved with CaF 2 additions and confirms the decreasing basic character of this additive when the basicity of the bath increases.
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