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27Al Mas NMR and Aluminum X-Ray Absorption Near Edge Structure Study of Imogolite and Allophanes

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Clays and Clay Minerals

Abstract

This paper compares the results of 27Al nuclear magnetic resonance spectroscopy (NMR) and Al-K-edge X-ray Absorption Near Edge Structure (XANES) of natural imogolite and allophanes and some crystalline reference minerals. All soil allophanes studied contain 4-coordinated Al (AlIV). The highest relative proportion of AlIV, 21% of the total Al, was found in Si-rich allophane. This value is close to that found in spring allophanes, which were previously considered to be different from soil allophanes. For a quantitative determination of the AlIV/Altotal ratio, NMR is more reliable than XANES, because of the sensitivity of the chemical shift to low AlIV concentrations, but XANES may be used even if paramagnetic impurities (mostly Fe) are present. Al-K XANES also yields more information than NMR on the local environment of AlVI and especially site multiplicity. AlVI XANES of imogolite and allophanes are similar regardless of the Al/Si ratio. They yield two well-resolved resonances with maxima near 1568 and 1570 eV, which indicates the presence of a unique AlVI site by comparison with crystalline references. The presence of only one AlVI site indicates that imogolite and allophanes have an octahedral sheet with a structure similar to 2/1 dioctahedral phyllosilicates but different from gibbsite or kaolinite, previously considered as structural analogues. The 27AlIV MAS NMR peak maxima of allophanes are between 58.6 and 59.8 ppm, in the range observed for crystalline and amorphous framework alumino-silicates, and less positive than those of sheet silicates, which are typically in the range 65–75 ppm. 27Al-H1 CPMAS NMR spectra suggest that both AlIV and AlVI have Al-O-H linkages.

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Authors and Affiliations

  1. Laboratoire de Minéralogie-Cristallographie, UA CNRS 09, Universités Paris 6 et 7 and IPGP, 4 place Jussieu, 75252, Paris Cedex 05, France

    Ph. Ildefonse & G. Calas

  2. Department of Geology, University of Illinois at Urbana-Champaign, 205 NHB, Urbana, Illinois, 61801, USA

    R. J. Kirkpatrick & B. Montez

  3. LURE, CNRS/CEA/MEN, 91405, Orsay, France

    A. M. Flank & P. Lagarde

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  1. Ph. Ildefonse
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  2. R. J. Kirkpatrick
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  4. G. Calas
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  5. A. M. Flank
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  6. P. Lagarde
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Ildefonse, P., Kirkpatrick, R.J., Montez, B. et al. 27Al Mas NMR and Aluminum X-Ray Absorption Near Edge Structure Study of Imogolite and Allophanes. Clays Clay Miner. 42, 276–287 (1994). https://doi.org/10.1346/CCMN.1994.0420306

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  • DOI: https://doi.org/10.1346/CCMN.1994.0420306

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