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Analysis of Iron-Bearing Clay Minerals by Electron Spectroscopy for Chemical Analysis (ESCA)

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Clays and Clay Minerals

Abstract

Nontronite and biotite were analyzed by Electron Spectroscopy for Chemical Analysis (ESCA). Both minerals yielded ESCA spectra with well-defined peaks and the elements identified by the ESCA spectra were in good agreement with the molecular formulas. High resolution scans were made of the iron (2p3/2) and oxygen (1s) electron binding energies for oxidized and reduced forms of nontronite and biotite. Binding energies for Fe3+ were observed at 711.8 eV in dithionite-reduced nontronite and in oxidized biotite. Peaks for Fe2+ occurred at 710.0 eV for unaltered biotite, at 709 eV for oxidized biotite and at 708.6 eV for hydrazine-reduced and dithionite-reduced nontronite. The oxygen (1s) peak for unaltered nontronite was skewed to the high energy side of the 530.6 eV maximum, but became more symmetrical as the Fe2+ content increased.

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Authors and Affiliations

  1. University of Illinois, USA

    J. W. Stucki (Former Graduate Research Assistant)

  2. Purdue University, West Lafayette, IN, 47907, USA

    C. B. Roth (Assistant Professor of Agronomy) & W. E. Baitinger (Instructor in Chemistry)

Authors
  1. J. W. Stucki
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  2. C. B. Roth
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  3. W. E. Baitinger
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Additional information

Journal Paper 6253, Purdue University, Agricultural Experiment Station, West Lafayette, IN 47907, U.S.A.

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Stucki, J.W., Roth, C.B. & Baitinger, W.E. Analysis of Iron-Bearing Clay Minerals by Electron Spectroscopy for Chemical Analysis (ESCA). Clays Clay Miner. 24, 289–292 (1976). https://doi.org/10.1346/CCMN.1976.0240603

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  • DOI: https://doi.org/10.1346/CCMN.1976.0240603

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