Formation and crystallographical structure of hydroxysulphate and hydroxycarbonate green rusts synthetised by coprecipitation

Abstract : Hydroxycarbonate {GR(CO32−)} and hydroxysulphate {GR(SO42−)} green rusts are synthesised by coprecipitation. Mössbauer spectroscopy shows that for both compounds the FeII: FeIII ratio is 2:1. A Rietveld refinement of a high resolution X-ray powder diffractogram of GR(CO32−) that uses a disordered pyroaurite like structure is performed. It leads to the cell parameters a=3.17588(2) Å and c=22.7123(3) Å and to a refined chemical formula [FeII4FeIII2(OH)12]2+[CO3, 3H2O]2− with Z=1/2. By comparing the structural properties of GR(SO42−) and GR(CO32−), the preferential formation of GR(SO42−) in aqueous solution is explained.
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Submitted on : Wednesday, December 12, 2018 - 4:46:22 PM
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Rabha Aissa, Michel Francois, Christian Ruby, Francois Fauth, Ghouti Medjahdi, et al.. Formation and crystallographical structure of hydroxysulphate and hydroxycarbonate green rusts synthetised by coprecipitation. Journal of Physics and Chemistry of Solids, Elsevier, 2006, 67 (5-6), pp.1016-1019. ⟨10.1016/j.jpcs.2006.01.020⟩. ⟨hal-01953200⟩

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