The structure of Ni(II)−Fe(III) hydroxy-chloride green rusts by Mössbauer spectroscopy and X-ray diffraction |
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| Authors: | Ph. Refait J. -M. R. Génin |
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| Affiliation: | 1. Laboratoire CNRS Maurice Letort UP 6851, Groupe de Spectrométrie M?ssbauer Département Sciences des Matériaux, Université de Nancy 1, ESSTIN, Párc R. Bentz, F 54500, Vandoeuvre-Nancy, France
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| Abstract: | The crystallographic structure of Ni(II)?Fe(III) hydroxy-chloride green rusts obtained by oxidation of a FexNi1?x(OH)2 precipitate is isomorphous with that of the ferrousferric green rust one and independent of the value of P=Fe/Ni. Mössbauer spectra exhibit two quadrupole doublets after further oxidation of the compounds which correspond to a formula (3-x)Ni(OH)2 · xFeOOH · Fe(OH)2Cl. The Fe3+ ions are found to occupy preferentially the sites close to the Cl? ions and the Ni2+ those far from them. However the ordering of the Fe3+ ions is not perfect. |
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