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Oxidation of pyroaurite-like Ni-Fe hydroxychlorides studied by Mössbauer spectroscopy at 16 K

  • Ph. Refait (a1), M. Abdelmoula (a1) and J.-M. R. Génin (a2)

Extract

A recent article by Refait & Génin (1997) was devoted to Ni(II)-Fe(II)-Fe(III) pyroaurite-like hydroxychlorides obtained by aerial oxidation of mixed Ni(II)-Fe(II) hydroxides with various P = Fe/Ni ratios in chloride-containing aqueous solutions. Corresponding to the ideal composition Ni3-x IIFex IIFeIII(OH)8Cl.nH2O , the Fe(III)/[Ni(II)+Fe(II)] ratio is 1/3 when P is >1/3. These hydroxyehlorides oxidize quickly and the final product depends on P. In the absence of nickel, P = ∞, FeII 3FeIII(OH)8Cl.nH2O, known as Green Rust one (Bemal et al, 1959) oxidizes into γ-FeOOH. When P is >5/3, the X-ray diffraction (XRD) analyses of the end-product reveal lepidocrocite and some Ni(II)-Fe(III) hydroxychloride.

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Bemal, J.D., Dasgupta, D.R. & Mackay, A.L. (i959) The oxides and hydroxides of iron and their structural inter-relationships. Clay Miner. Bull. 4, 15–30.
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Refait, Ph. & Génin, J.-M. R. (1993) The oxidation of ferrous hydroxide in chloride-containing aqueous media and Pourbaix diagrams of green rust one. Corros. Sei. 34, 797819.
Refait, Ph. & Génin, J.-M. R. (1997) Mechanisms of oxidation of Ni(II)-Fe(II) hydroxides in chloridecontaining aqueous media: role of the pyroauritetype Ni-Fe hydroxychlorides. Clay Miner. 32, 597613.
Refait, Ph., Bauer, Ph. & Génin, J.-M.R. (1991) Low temperature CEMS determination of the morphology of rust layers on an iron plate corroded in KCI solution. Hyp. Int. 69, 831834.

Oxidation of pyroaurite-like Ni-Fe hydroxychlorides studied by Mössbauer spectroscopy at 16 K

  • Ph. Refait (a1), M. Abdelmoula (a1) and J.-M. R. Génin (a2)

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