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

Reinhard Stösser (1) , Michael Feist (1) , Kerstin Patzwaldt (1) , Michael Menzel (2) , Franziska Emmerling (1)

1 Institut für Chemie der Humboldt-Universität zu Berlin
2 Bundesanstalt für Materialforschung und -prüfung

Thermally induced redox reactions of K[Fe(CN)] ( 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 and redox processes can be tuned to form doped AlO systems which contain either isolated Fe centres or redox active phases and precursors like (AlFe)O (), (AlFe)O (), FeO, FeO and Fe. The phase FeC and the chemically reactive C-species were detected during the reaction of . The final composition of the doped products of α-AlO 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 (N, N/O or N/H). From the solid state chemistry point of view it is interesting that the transforming matrix (, ) possesses both oxidative and protective properties and that the incorporation of the Fe species can be performed systematically.

Mots clés: ESR and Mößbauer spectroscopy; Mechanical activation; Potassium hexacyanoferrate(III); Redox reactions; TA-MS measurements; XRD

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Reinhard Stösser, Michael Feist, Kerstin Patzwaldt, Michael Menzel, Franziska Emmerling. Redox reactions of K[Fe(CN)] during mechanochemically stimulated phase transitions of AlOOH. Journal of Physics and Chemistry of Solids, 2011, ⟨10.1016/j.jpcs.2011.03.016⟩. ⟨hal-00753044⟩