Abstract

A recent topic in the discussion of fluoride mixtures containing AlF₃ is the possible existence of the complex AlF₅^2-. The dissociation schemes in question are the following: AlF₆³⁻ = AlF₅²⁻ + F⁻ (Ia) AlF₅²⁻ = AlF₄⁻ + F⁻ (Ib) or AlF₆³⁻ = AlF₄⁻ + 2F⁻ (II) The question is whether reaction II is sufficient to describe the molten mixture of <i>MF</i>-AlF₃ (where <i>M</i> = Li⁺, Na⁺, and K⁺) or whether reactions Ia and Ib are required. Our examination of the evidence accumulated so far shows that experimental data are not conclusive.

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