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Thermal decomposition of ammonium fluoroferrates (NH4)xFeF2x (2≤x≤3)

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Abstract

Different ammonium fluoroferrates (NH4)xFeF2x (2≤x≤3) have been investigated. The thermal decomposition of the compounds obtained can be interpreted by their identical crystal structures (cryolite type). The decomposition products of all ammonium fluoroferrates formed in initial stage are isostructural of NH4FeF4. The decomposition is accompanied by the partial reduction of Fe(III) to Fe(II) by ammonium isolated. The end product of the thermal decomposition is FeF2 and FeF3 mixture.

Zusammenfassung

Es wurden verschiedene Ammoniumfluoroferrate (NH4)xFeF2x (2≤x≤3) untersucht. Die thermische Zersetzung der erhaltenen Verbindungen kann anhand ihrer gleichen Kristallstruktur (Kryolith-Typ) erklärt werden. Alle beim ersten Zersetzungsschritt geformten Ammonium fluoroferrate sind isostrukturell mit NH4FeF4. Die Zersetzung wird von einer teilweisen Reduktion von Fe(III) zu Fe(II) begleitet. Das Endprodukt der thermischen Zersetzung ist ein Gemisch aus FeF2 und FeF3.

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Authors and Affiliations

  1. Institute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia

    N. M. Laptash & S. A. Polyshchuk

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  1. N. M. Laptash
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  2. S. A. Polyshchuk
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Laptash, N.M., Polyshchuk, S.A. Thermal decomposition of ammonium fluoroferrates (NH4)xFeF2x (2≤x≤3). Journal of Thermal Analysis 44, 877–883 (1995). https://doi.org/10.1007/BF02547272

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  • DOI: https://doi.org/10.1007/BF02547272

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