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Transformation of synthetic Zn-stevensite to Zn-talc induced by the Hofmann-Klemen effect

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Clays and Clay Minerals

Abstract

Stevensite-like sauconite, with the general composition: \({\rm{S}}{{\rm{i}}_4}\left( {{\rm{Z}}{{\rm{n}}_{3 - x}}{\square _x}} \right){{\rm{O}}_{10}}{\left( {{\rm{OH}}} \right)_2}R_{2x}^ + \), where □ is a vacant site, was synthesized. The objective was to study the possible migration of some cations (Li+ and Zn2+) within such trioctahedral smectites, under heating, following the so-called ‘Hofmann-Klemen’ (HK) effect. The initial gel was divided into five aliquots and placed in teflon-coated hydrothermal reactors with distilled water, and these were hydrothermally treated at 80, 100, 120, 150, and 200°C, respectively, over 30 days. X-ray diffraction (XRD) analysis confirmed that the samples synthesized were smectites. The number of vacant sites (x) per half unit cell (O10(OH)2) ranged from nearly 0 to 0.23 but no simple relationship was established between x and the temperature of synthesis. The samples were Li+- and Zn2+-saturated, and heated overnight at 300°C (HK treatment). Cation exchange capacity measurements were made by Fourier transform infrared spectroscopy (FTIR) on \({\rm{NH}}_4^ + \)-saturated samples. After LiHK treatment, the structural formula of samples could be expressed as: \({\rm{S}}{{\rm{i}}_4}{\rm{Z}}{{\rm{n}}_{\left( {3 - x} \right)}}{\rm{L}}{{\rm{i}}_x}{{\rm{O}}_{10}}{\left( {{\rm{OH}}} \right)_2}{\rm{NH}}_{4x}^{\; + }\), while after ZnHK treatment, it could be expressed as: Si4Zn3O10(OH)2. Analysis by XRD and FTIR showed that the samples moved from a Zn-stevensite-like structure to Zn-talc-like structure after treatment with ZnHK. These results are interpreted asevidence that Zn2+ (and Li+) migrated into the previously vacant sites under HK treatment.

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Authors and Affiliations

  1. FRE3114 CNRS, HydrASA, Université de Poitiers, 40 Avenue du Recteur Pineau, F-86022, POITIERS Cedex, France

    S. Petit, D. Righi & A. Decarreau

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  1. S. Petit
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  2. D. Righi
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  3. A. Decarreau
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Correspondence to S. Petit.

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Petit, S., Righi, D. & Decarreau, A. Transformation of synthetic Zn-stevensite to Zn-talc induced by the Hofmann-Klemen effect. Clays Clay Miner. 56, 645–654 (2008). https://doi.org/10.1346/CCMN.2008.0560605

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  • DOI: https://doi.org/10.1346/CCMN.2008.0560605

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