Structural entities in NaFAlF3 melts containing alumina

The model developed can be described by the following dissociation equilibria: Al2F--7 + F-- = 2AlF--4; AlF--4 + 2F-- = AlF3--6; F3Al--O--AlF2--3 + 2xF-- = Fe3+xAl--O--AlF3+x; F2Al-OOAlF2--2 + 2xF-- = F2+xAl OOAlF2(x+1)--2+x. Sodium is proposed to be the only cation in the system. The model is deriv...

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Veröffentlicht in:Electrochimica acta 1980-12, Vol.25 (12), p.1673-1677
1. Verfasser: Sterten, A
Format: Artikel
Sprache:eng
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Zusammenfassung:The model developed can be described by the following dissociation equilibria: Al2F--7 + F-- = 2AlF--4; AlF--4 + 2F-- = AlF3--6; F3Al--O--AlF2--3 + 2xF-- = Fe3+xAl--O--AlF3+x; F2Al-OOAlF2--2 + 2xF-- = F2+xAl OOAlF2(x+1)--2+x. Sodium is proposed to be the only cation in the system. The model is derived from activity data for NaF and AlF3 in melts saturated with Al2O3 at 1285 deg K and the assumption of an ideal ionic mixture, with randomly distributed anions on the anion position in the melt. Available data seem to fit reasonably well. Al2F--7 will only be present in AlF3-rich melts. Oxygen atoms in the complexes are most probably involved in bridging bonds of the type Al--O--Al and OOAl. It appears that Al atoms are involved in four bonds in AlF3-rich melts. The number of bonds changes partly towards five and/or six with increasing NaF content of the melt.25 refs.--EPAA/AF.
ISSN:0013-4686
DOI:10.1016/0013-4686(80)80021-1