The molten NaF−AlF 3 system has been studied by 27 Al NMR over the composition range 0.2 < X°(AlF 3 ) < 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 (AlF 4 -, AlF 5 2 -, AlF 6 3 - ). The agreement between experimental and calculated shifts strengthens the reliability of the suggested model.
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Robert et al. (1999) studied this question.
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