Reflexion Mössbauer analysis of the in situ oxidation products hydroxycarbonate green rust

Abstract : The purpose of this study is to determine the nature of the oxidation products of FeII-III hydroxycarbonate FeII4FeIII2(OH)12CO3•3H2O (green rust GR(CO32-)) by using the miniaturised Mössbauer spectrometer MIMOS II. Two Mössbauer measurements methods are used: method (i) with green rust pastes coated with glycerol and spread into Plexiglas sample holders, and method (ii) with green rust pastes in the same sample holders but introduced into a gas-tight cell with a beryllium window under a continuous nitrogen flow. Method (ii) allows us to follow the continuous deprotonation of GR(CO32-) into the fully ferric deprotonated form FeIII6O4(OH)8CO3•3H2O by adding the correct amount of H2O2, without any further oxidation or degradation of the samples.
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Sebastien Naille, Mustapha Abdelmoula, Didier Louber, Paul Moulin Jean, Christian Ruby. Reflexion Mössbauer analysis of the in situ oxidation products hydroxycarbonate green rust. International Conference on the applications of the Mössbauer Effects (ICAME 2009), Jul 2009, Vienna, Austria. pp.1;5, ⟨10.1088/1742-6596/217/1/012084⟩. ⟨hal-00526697⟩

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