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Remarks on the Hypothetical Existence of the Aluminum Pentafluoride Ion

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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:

AlF6 3− = AlF5 2− + F       (Ia)

AlF5 2− = AlF4 + F       (Ib)


AlF6 3− = AlF4 + 2F       (II)

The question is whether reaction II is sufficient to describe the molten mixture of MF-AlF3 (where M = 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.

Keywords: Aluminum pentafluoride; Melt models; Raman spectroscopy

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/0003702934066668

Affiliations: Department of Physical Chemistry, Norwegian Institute of Technology, University of Trondheim, N-7034 Trondheim, Norway

Publication date: March 1, 1993

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