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Evidence of structural Fe(II) ions in Font-Bouillant kaolinites: a Mössbauer study

  • C. Ruby (a1), Ph. Refait (a1), J.-M. R. Génin (a1), T. Delineau (a2) and J. Yvon (a2)...

Extract

Ferric oxides or hydroxides are common minor components of kaolinites. If free, these minerals can be removed by Fe reduction and leaching (Mehra & Jackson, 1960), but Fe3+ ions can substitute for Al3+ ions in the octahedral sites of kaolinite (Weaver et al., 1967; Malden & Meads, 1967). Moreover, Fe2+ ions can also substitute trioctahedrally in place of dioctahedral Al, leading to a local composition of Fe-antigorite (Cuttler, 1980).

The Font-Bouillant quarry (Charentes, France) is the source of disordered kaolinite known as ‘FU7, U-7-10 or FBT’ (Cases et al., 1982, 1986). The samples used in this study were considered in an earlier genetic analysis of the deposit (Delineau, 1994; Delineau et al., 1994) and were analysed previously by X-ray diffraction (XRD), infrared (IR) spectroscopy, electron paramagnetic resonance (EPR) and UV-visible spectroscopy by Delineau et al. (1994) (Table 1).

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Cases, J.M., Liétard, O., Yvon, J. & Delon IF. (1982) Etude des propriétés cristallographiques, morphologiques et superficielles de kaolinites désordonnées. Bull. Soc. jr. Min. Crist. 105, 439457.
Cases, J.M., Cunin, P., Grillet, Y., Poinsignon, C. & Yvon, J. (1986) Methods of analysing morphology of kaolinite : relations between crystallographic and morphological properties. Clay Miner. 21, 5568.
Cuttler, A.H. (1980) The behaviour of a synthetic 57Fedoped kaolinite: Mössbauer and EPR studies. Clay Miner. 15, 429444.
Delineau, Th. (1994) Les argiles kaoliniques du bassin des Charentes (France) Analyses typologiques, cristallo-chimiques, spéciation du fer et applications. Thesis INPL, Nancy, France.
Delineau, Th., Allard, Th., Muller, J.P., Yvon L, Barres, O. & Cases, J.M. (1994) FTIR reflectance vs. EPR studies of structural iron in kaolinite. Clays Clay Miner. 42, 308320.
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Maiden, P.J. & Meads, R.E. (1967) Substitution by iron in kaolinite. Nature. 215, 844846.
Mehra, O.P. & Jackson, M.L. (1960) Iron oxide removal from soil and clays by a dithionite-citrate system buffered with sodium carbonate. Clays Clay Miner. 7, 317327.
Murad, E. (1982) The characterization of goethite by Mössbauer spectroscopy. Am. Miner. 67, 10071011.
Murad, E. & Wagner, U. (1991) Mössbauer spectra of kaolinite, halloysite and the firing products of kaolinite: new results and a reappraisal of published work. Neues Jahrb. Min. Abh. 162, 281309.
Olowe, A.A., Refait, Ph. & Génin, J.-M.R. (1990) Superparamagnetic behaviour of goethite prepared in sulphated medium. Hyp. Inter. 57, 20372041.
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Evidence of structural Fe(II) ions in Font-Bouillant kaolinites: a Mössbauer study

  • C. Ruby (a1), Ph. Refait (a1), J.-M. R. Génin (a1), T. Delineau (a2) and J. Yvon (a2)...

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