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

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

2010-10-19

arxiv.org/abs/1010.3852v1

International Conference on the applications of the M\"ossbauer Effects (ICAME 2009), Vienna : Austria (2009)

Physics

Chemical Physics

Scientific paper

10.1088/1742-6596/217/1/012084

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 M\"ossbauer spectrometer MIMOS II. Two M\"ossbauer 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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