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| Names | |
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| IUPAC name
Dipotassium heptafluoroniobium[1]
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.037.246 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| F7K2Nb | |
| Molar mass | 304.0918 g·mol−1 |
| Appearance | white solid |
| Melting point | 735 °C (1,355 °F; 1,008 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Potassium heptafluoroniobate is the inorganic compound with the formula K2NbF7. A white water-soluble salt, it is one of the more important fluorides of niobium. It is often invoked as an intermediate in the separation of niobium from tantalum. These two elements are generally found together in ores (e.g. columbite) and their separation presents a challenge since they form very similar compounds. The basis of their separation hinges on the stability and solubility of the fluorides and oxyfluorides. Reduction of this salt gives niobium metal.[3]
- ^ a b "Niobium potassium fluoride". pubchem.ncbi.nlm.nih.gov. Retrieved 22 May 2024.
- ^ "POTASSIUM HEPTAFLUORONIOBATE(V) | F7K2Nb | ChemSpider". www.chemspider.com. Retrieved 22 May 2024.
- ^ Matthiesen, F.; Christensen, E.; von Barner, J. H.; Bjerrum, N. J. (1996). "The Redox Chemistry of Niobium(V) Fluoro and Oxofluoro Complexes in LiF-NaF-KF Melts". Journal of the Electrochemical Society. 143 (6): 1793–1799. Bibcode:1996JElS..143.1793M. doi:10.1149/1.1836906.