Niobium-containing fluoride melts

1 - la - melting point 2 — 7 - 780°C (15-minutes intervals) 8 - 900°C. Reproduced from [363], A. I. Agulyansky, V. A. Bessonova, Zh. Neorg. Khim. 29 (1984) 79, Copyright 1984, with permission of Nauka (Russian Academy of Sciences) publishing. [Pg.185]

Complexes in fluoride melts - niobium-containing melts [Pg.186]

While the band at 602 cm 1 can be unambiguously attributed to the v3 mode of NbF6 ions, the interpretation of the bands at 1030 and 640 cm 1 requires additional explanations. [Pg.187]

It is important to mention that the band at 1030 cm 1 increases along with the band at 640 cm 1, while no bands are observed in the range of 1000-800 cm 1. [Pg.189]

The IR spectra of niobium-containing fluoride melts show the presence of [Nb OFs] , with [Nb OF6] at higher O/Nb ratios. The Raman spectra of Nb205 powders produced by decomposition of niobium(V) pentabutoxide showed that they were amorphous, and contained a Nb-O-Nb network. " ... [Pg.246]

Table 49 lists the melting points of some niobium-containing fluoride compounds. [Pg.143]

Systematic investigations of the electro-conductivity of niobium-containing fluoride and oxyfluoride melts were not performed. Some measurements were performed on the molten mixtures KCl - K2NbF7, KCl - KF - K2NbF7 by... [Pg.150]

Investigation of fluoride melts containing tantalum or niobium is a very difficult procedure that involves high temperatures, corrosion activity and the... [Pg.135]

Three conceptual steps can be discerned in the definition of the ionic structure of fluoride melts containing tantalum or niobium. Based on the very first thermodynamic calculations and melting diagram analysis, it was initially believed that the coordination numbers of tantalum and niobium, in a molten system containing alkali metal fluorides, increase up to 8. [Pg.136]

Analysis of the melting diagrams led to the conclusion that fluoride, fluoride-chloride and oxyfluoride-chloride melts containing niobium contain the complex ions NbF83 NbF7Cl3 Nb02F43 ... [Pg.143]

Physicochemical properties of fluoride melts containing niobium... [Pg.150]

The method based on a net melt-holder is used successfully for materials with relatively low melting points and is less promising for the investigation of fluoride melts containing tantalum and niobium. [Pg.169]

A similar electrolyte, containing potassium heptafluoroniobate, K2NbF7, can be used for the electrolytic reduction of niobium [37, 542 - 544]. No industrial application, however, was found for the electrolysis of niobium in fluoride-chloride melts. [Pg.322]

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