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Clays and Clay Minerals; August 2000; v. 48; no. 4; p. 433-438
© 2000 Clay Minerals Society
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CHARACTERIZATION AND ASSIGNMENT OF FAR INFRARED ABSORPTION BANDS OF K+ IN MUSCOVITE

M. Diaz1, V.C. Farmer2 and R. Prost1

1 Unité de Science du Sol, INRA, Route de Saint Cyr, 78026 Versailles, cedex, France
2 Soil Science Group, Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8QH, UK

E-mail of corresponding author: prost{at}versailles.inra.fr

To assign far infrared (FIR) absorption bands of K+ in muscovite, dichroic experiments were performed. For a muscovite crystal rotated about a crystallographic axis, c*, a, or b, two bands corresponding to vibration modes of K+ appear, respectively, at 107 and 110 cm–1 (rotation about c*), 107 and 143 cm–1 (rotation about a), and 110 and 143 cm–1 (rotation about b). Two in-plane modes at 107 and 110 cm–1 and one out-of-plane mode at 143 cm–1 are identified for the vibrations of K+ in muscovite. Each of these transition moments are near the crystallographic axes b, a, and c, respectively. These observations match well predictions based on the approximate C3i symmetric environment of K+, although the site symmetry in the space group of muscovite is only C2.

Key Words: Dichroism • Far Infrared • Muscovite • Potassium • Transition Moment • Vibration Mode




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