STUDY OF NAF-ALF3 MELTS BY HIGH-TEMPERATURE 27AL NMR SPECTROSCOPY : COMPARISON WITH RESULTS FROM RAMAN SPECTROSCOPY

The molten NaF−AlF3 system has been studied by 27Al NMR over the composition range 0.2 < X°(AlF3) < 0.5, using a high-temperature laser heating system. The experimental chemical shifts have been compared to the shifts calculated on the basis of a model obtained by the combination of Raman spectroscopy and thermodynamics results. This model involves three fluoroaluminate complexes (AlF4-, AlF52-, AlF63-). The agreement between experimental and calculated shifts strengthens the reliability of the suggested model.