Abstract
The OH-stretching modes of kaolinite group minerals, namely kaolinite, dickite, and nacrite, are investigated within the density functional theory framework. Good agreement between theoretical and experimentally derived structures is obtained. The total energy of the three polymorphs is found to be similar within 1 kJ/mol. After a review of existing experimental data, infrared and Raman spectra of the three polymorphs are computed. While interpreting the spectra, special attention is given to the role played by the macroscopic geometry of the system, explaining the differences experimentally observed between infrared and Raman spectra. In dickite and nacrite, a significant interlayer coupling is observed for the modes polarized along a direction nearly parallel to c*. The assignment of OHstretching bands is given in a consistent way and is compared with previous suggestions.
© 2015 by Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
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Artikel in diesem Heft
- Contact metamorphism of the White Mountain Peak metavolcanic complex, eastern California
- Structure and luminescence characteristics of quartz from pegmatites
- Evidence for monazite-, barite-, and AgMnO4 (distorted barite)-type structures of CaSO4 at high pressure and temperature
- The “template” effect of the extra-framework content on zeolite compression: The case of yugawaralite
- The influence of OH in coesite on the kinetics of the coesite-quartz phase transition
- First-principles study of hydrogen bond symmetrization of phase D under high pressure
- First-principles study of OH-stretching modes in kaolinite, dickite, and nacrite
- A systematic study of OH in hydrous wadsleyite from polarized FTIR spectroscopy and single-crystal X-ray diffraction: Oxygen sites for hydrogen storage in Earthʼs interior
- Determination of the content and distribution of fixed ammonium in illite-smectite using a modified X-ray diffraction technique: Application to oil source rocks of western Greenland
- Determination of defect structures in kaolin minerals by high-resolution transmission electron microscopy (HRTEM)
- Mössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry
- Allanite and epidote weathering at the Coweeta Hydrologic Laboratory, western North Carolina, U.S.A.
- Ca2SiO3OHFA high-pressure phase with dense calcium polyhedral packing and tetrahedral silicon
- Relationships between SEM-cathodoluminescence response and trace-element composition of hydrothermal vein quartz
- Quantitative evaluation of attenuation contrast of X-ray computed tomography images using monochromatized beams
- Biotic and abiotic products of Mn(II) oxidation by spores of the marine Bacillus sp. strain SG-1
- The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene
- Crystal structures of chalcostibite (CuSbS2) and emplectite (CuBiS2): Structural relationship of stereochemical activity between chalcostibite and emplectite
- Hydration and swelling of synthetic Na-saponites: Influence of layer charge
- Dehydroxylation and CO2 incorporation in annealed mica (sericite): An infrared spectroscopic study
- Relict coesite exsolution in omphacite from Western Tianshan eclogites, China
- Hyperfine electric field gradients and local distortion environments of octahedrally coordinated Fe2+
- A synchrotron Mössbauer spectroscopy study of (Mg,Fe)SiO3 perovskite up to 120 GPa
- Temporal stability and pressure calibration of barium carbonate and talc/pyrex pressure media in a piston-cylinder apparatus
- Cation ordering in magnesioferrite, MgFe2O4, to 982 °C using in situ synchrotron X-ray powder diffraction
- Halite-sylvite thermoconsolution
- The role of water in the structures of synthetic hallimondite, Pb2[(UO2)(AsO4)2](H2O)n and synthetic parsonsite, Pb2[(UO2)(PO4)2](H2O)n, 0 ≤ n ≤ 0.5
- Variable-temperature structural studies of tetranatrolite from Mt. Saint-Hilaire: Synchrotron X-ray powder diffraction and Rietveld analysis
- Letter. Pressure-induced stabilization of ordered paranatrolite: A new insight into the paranatrolite controversy
- Letter. The effect of zinc sulfide on phase transformations of ferrihydrite
- Letter. Stability and equation of state of MgGeO3 post-perovskite phase
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