Hydrothermal synthesis of beidellites : Characterization and study of the cis- and trans-vacant character
Lantenois, Sébastien (Université Montpellier 2. Institut Charles Gerhardt)
Muller, Fabrice (Université d'Orléans. Institut des Sciences de la Terre d'Orléans)
Beny, Jean-Michel (Université d'Orléans. Institut des Sciences de la Terre d'Orléans)
Mahiaoui, Jamel (Université Montpellier 2. Institut Charles Gerhardt)
Champallier, Rémi (Université d'Orléans. Institut des Sciences de la Terre d'Orléans (ISTO). CNRS)

Date:	2008
Abstract:	Low-charge beidellites were synthesized by a hydrothermal treatment applied to an amorphous gel phase in basic solution. The hydrothermal conditions for the syntheses were chosen from the stability field of beidellite previously investigated in the literature. The synthetic samples were characterized chemically and structurally using X-ray diffraction, infrared spectroscopy, cation exchange capacity measurement, and chemical and thermal analyses. We compared the synthetic sample with a natural beidellite sample (SbId) from Idaho, USA, looking at chemical composition and particle size. The main difference is the octahedral site occupancy (cis- or trans-vacant layer structure). The natural SbId sample has trans-vacant layers and the synthetic sample has a preferentially cis-vacant character. This character can be modulated, using specific synthesis conditions. The cis- or trans-vacant layer structure of various synthetic beidellites was investigated at low temperature (<350°C and pressure (<25 MPa). Depending on the pressure and/or synthesis temperature, the proportion of cis-vacant layers ranges from 20 to 100% and increases with the layer-charge deficit.
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Beidellite ; Chemical analyses ; Cis-vacant layer ; FTIR spectroscopy ; Hydrothermal syntheses ; Smectite ; TGA ; Trans-vacant layer ; XRD
Published in:	Clays and Clay Minerals, Vol. 56, Núm. 1 (2008) , p. 39-48, ISSN 1552-8367

DOI: 10.1346/CCMN.2008.0560104

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