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American Mineralogist; August 2002; v. 87; no. 8-9; p. 1207-1214
© 2002 Mineralogical Society of America
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Far infrared spectra of K+ in dioctahedral and trioctahedral mixed-layer minerals

Magali Diaz1,*, Valérie Laperche2, James Harsh3 and René Prost1

1 INRA, Unité de Science du Sol, route de Saint Cyr, 78026 Versailles cedex, France
2 CNRSSP, 930 Boulevard Lahure, BP 537, 59505, Douai cedex, France
3 Department of Crop and Soil Sciences, Washington State University, Pullman, U.S.A.

Correspondence: * E-mail: mdiaz{at}versailles.inra.fr

Mixed-layer minerals were analyzed by far infrared (FIR) spectrometry. The FIR spectra show two bands, which occur at 84–87 and 108–114 cm–1 for mixed-layer illite-smectite (I-S) and at 71–79 and 103 cm–1 for mixed-layer phlogopite/vermiculite (P-V). The 103 cm–1 band seen in the P-V series from Palabora is independent of K+ content and is attributed to lattice vibrations. The lower wavenumber band observed at 85 cm–1 for I-S mixed-layers and 71–73 cm–1 for P-V mixed-layers corresponds to K+ fixed in the two-layer stacking sequences. This low wavenumber band shifts to higher wavenumbers as the thickness of coherent scattering domains increases: shifting toward 97 cm–1 for the illite end-member of the I-S series and to 79 cm–1 for Palabora phlogopite, the end-member of the P-V series.




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Dehydroxylation and CO2 incorporation in annealed mica (sericite): An infrared spectroscopic study
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[Abstract] [Full Text] [PDF]


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