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Redox reactions of K3[Fe(CN)6] during mechanochemically stimulated phase transitions of AlOOH

  • Thermally induced redox reactions of K3[Fe(CN)6] (1) were investigated for a broad temperature range by thermal methods and structure analytical methods (ESR and Mößbauer spectroscopy, X-ray Powder diffraction and XANES). Based on the influence of the mechanically activated and transforming matrices 2 and 3, redox processes can be tuned to form doped Al2O3 systems which contain either isolated Fe3+ centres or redox active phases and precursors like (Al1-xFex)2O3 (4), (Al3-xFex)O4 (5), Fe3O4, Fe2O3 and Fe0. The phase Fe3C and the chemically reactive C-species were detected during the reaction of 1. The final composition of the doped products of α-Al2O3 is mainly influenced by the chemical nature of the Fe doping component, the applied temperature and time regime, and the composition of the gas phase (N2, N2/O2 or N2/H2). From the solid state chemistry point of view it is interesting that the transforming matrix (2 and 3) possesses both oxidative and protective properties and that theThermally induced redox reactions of K3[Fe(CN)6] (1) were investigated for a broad temperature range by thermal methods and structure analytical methods (ESR and Mößbauer spectroscopy, X-ray Powder diffraction and XANES). Based on the influence of the mechanically activated and transforming matrices 2 and 3, redox processes can be tuned to form doped Al2O3 systems which contain either isolated Fe3+ centres or redox active phases and precursors like (Al1-xFex)2O3 (4), (Al3-xFex)O4 (5), Fe3O4, Fe2O3 and Fe0. The phase Fe3C and the chemically reactive C-species were detected during the reaction of 1. The final composition of the doped products of α-Al2O3 is mainly influenced by the chemical nature of the Fe doping component, the applied temperature and time regime, and the composition of the gas phase (N2, N2/O2 or N2/H2). From the solid state chemistry point of view it is interesting that the transforming matrix (2 and 3) possesses both oxidative and protective properties and that the incorporation of the Fe species can be performed systematically.zeige mehrzeige weniger

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Metadaten
Autor*innen:R. Stößer, M. Feist, K. Patzwaldt, Michael Menzel, Franziska EmmerlingORCiD
Persönliche Herausgeber*innen:H. Brooks
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Journal of physics and chemistry of solids
Jahr der Erstveröffentlichung:2011
Verlag:Pergamon Press
Verlagsort:New York, NY
Jahrgang/Band:72
Ausgabe/Heft:6
Erste Seite:794
Letzte Seite:799
Freie Schlagwörter:A. Inorganic compounds; C. Mössbauer spectroscopy; C. Thermogravimetric analysis; D. Electron paramagnetic resonance; ESR-Spektroskopie; Kaliumhexacyanoferrat(III); Mechanische Aktivierung; Mößbauer-Spektroskopie; Redoxreaktionen; TA-MS-Messungen
DOI:10.1016/j.jpcs.2011.03.016
ISSN:0022-3697
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:23.05.2011
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