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Synthèse et étude cristallochimique de quelques aluminates et ferrites calciques hydratés de formule [Ca2 M(OH)6]+, [X,nH2O]- avec X=Cl, Br, I, ClO4, 1/2CO3 1/2CrO4 et 1/2SO4 et M=Al et Fe

Abstract : This work deals with the synthesis and the crystallographic study of some calcium aluminate and calcium ferrite with structural formulae [Ca2Al1-xFex(OH)6]+ [X, nH2O]-, commonly named "AFm phases" by the cement workers. These compounds belong to the layered double hydroxide (LDH) family and are composed by the stacking of positively charged main layers, and negatively charged interlayers. It was shown that the structural transition of the AFm-Cl phase is due to an ordering of the hydrogen bonds network. The crystallographic structures of several phases, AFm-(Cl, Br), AFm-(Cl, CO3), AFm-(Cl, SO4) and AFm-(CrO4) are given. An application of AFm-Cl like iodide sensor by voltammetric detection is detailed. Finally, calcium ferrite study has shown that a solid solution between aluminium and iron exists. However the substitute of Al3+ by Fe3+ gives some structural modifications, which are clearly emphasised by Mössbauer spectrometry and EXAFS.
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https://hal.univ-lorraine.fr/tel-01746861
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Jean-Philippe Rapin. Synthèse et étude cristallochimique de quelques aluminates et ferrites calciques hydratés de formule [Ca2 M(OH)6]+, [X,nH2O]- avec X=Cl, Br, I, ClO4, 1/2CO3 1/2CrO4 et 1/2SO4 et M=Al et Fe. Autre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10124⟩. ⟨tel-01746861⟩

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