Far-infrared spectra of synthetic dioctahedral muscovite and muscovite–tobelite series micas: Characterization and assignment of the interlayer I–Oinner and I–Oouter stretching bands
Abstract
Far-infrared spectroscopy and X‑ray powder diffraction Rietveld structure refinement for the hydrothermal synthetic muscovite series, (a) KAl3(Si3-yGey)O10(OH,OD)2, (b) KGa3(Si3-yGey)O10(OH,OD)2, and (c) K(Al3-xGax)Ge3O10(OH,OD)2, where x = 0.0-3.0, y = 0.0-3.0, and the muscovite-tobelite series, (d) [K1-A(NH4,ND4)A]Al3Si3O10(OH,OD)2, where A = 0.0-1.0, indicate that there is a complete solid-solution in each series. In the 200-50 cm-1 far-infrared region, four kinds of bands are observed: two bands due to octahedral deformation coupled with OH deformational vibrations between 240 and 130 cm-1, an in-plane tetrahedral torsional band between 175 and 130 cm-1, an interlayer I-Oinner stretching band, and an I-Oouter stretching band. The weak and broad 140 cm-1 band is assigned to K-Oinner stretching and the strong broad 110 cm-1 band to K-Oouter stretching in muscovite. The broad 175 cm-1 band is (NH4/ND4)-Oinner stretching and the 140 cm-1 broad strong band is (NH4/ND4)-Oouter stretching in tobelite. With increasing Ga→Al substitution, the I-Oinner and I-Oouter stretching bands shift to lower frequency, while with increasing Ge→Si substitution, the I-Oinner stretching band shifts to higher frequency; the I-Oouter stretching bands do not change as a function of composition.
© 2015 by Walter de Gruyter Berlin/Boston
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