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Characterization and Assignment of Far Infrared Absorption Bands of K+ in Muscovite

Published online by Cambridge University Press:  28 February 2024

M. Diaz ,
V. C. Farmer  and
R. Prost
M. Diaz
Affiliation:
Unité de Science du Sol, INRA, Route de Saint Cyr, 78026 Versailles, cedex, France
V. C. Farmer
Affiliation:
Soil Science Group, Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8QH, UK
R. Prost*
Affiliation:
Unité de Science du Sol, INRA, Route de Saint Cyr, 78026 Versailles, cedex, France
*
E-mail of corresponding author: prost@versailles.inra.fr
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Abstract

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.

Keywords

DichroismFar InfraredMuscovitePotassiumTransition MomentVibration Mode
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 4 , August 2000 , pp. 433 - 438
Copyright
Copyright © 2000, The Clay Minerals Society

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