Synthesis by Coprecipitation of Al-Substituted Hydroxysulphate Green Rust Fe 4 II Fe (2−y) III Al y III (OH)12SO4, nH2O

R. Aissa (1) , C. Ruby (1) , A. Gehin (1) , Mustapha Abdelmoula (1) , J- M. R Génin (1)

1 LCPME - Laboratoire de Chimie Physique et Microbiologie pour l'Environnement

Al-substituted hydroxysulphate green rust (Al-GR{SO4}) were synthesised by the coprecipitation of FeII, FeIII and AlIII cations. The Al-GR{SO4} crystals (∼50 nm) are significantly smaller than the hydroxysulphate green rust GR{SO4} crystals (∼500 nm). The Mössbauer spectrum of Al-GR{SO4} was adjusted with two ferrous doublets D1 and D3 and one ferric doublet D2. Doublet D3 is attributed to FeII ions that have AlIII ions as a first neighbour.

Mots clés: Green rust; aluminium substitution; TEM; coprecipitation

Domaines: Chimie; Matériaux

R. Aissa, C. Ruby, A. Gehin, Mustapha Abdelmoula, J- M. R Génin. Synthesis by Coprecipitation of Al-Substituted Hydroxysulphate Green Rust Fe 4 II Fe (2−y) III Al y III (OH)12SO4, nH2O. Hyperfine Interactions, 2004, 156 (1-4), pp.445-451. ⟨10.1023/B:HYPE.0000043266.49828.57⟩. ⟨hal-01959303⟩