Different level of fluorescence in Raman spectra of montmorillonites

0460794 - ÚGN 2017 RIV NL eng J - Článek v odborném periodiku
Ritz, M. - Vaculíková, Lenka - Kupková, J. - Plevová, Eva - Bartoňová, L.
Different level of fluorescence in Raman spectra of montmorillonites.
Vibrational Spectroscopy. Roč. 84, May 2016 (2016), s. 7-15. ISSN 0924-2031. E-ISSN 1873-3697
Grant CEP: GA MŠMT(CZ) LO1406; GA MŠMT ED2.1.00/03.0082
Institucionální podpora: RVO:68145535
Klíčová slova: Raman spectroscopy * fluorescence * montmorillonite
Kód oboru RIV: CB - Analytická chemie, separace
Impakt faktor: 1.740, rok: 2016
https://www.sciencedirect.com/science/article/pii/S0924203116300224?via%3Dihub

The paper presents the study of selected montmorillonite standards by Raman spectroscopy and microscopy supported by elemental analysis, X-ray powder diffraction analysis and thermal analysis. Dispersive Raman spectroscopy with excitation lasers of 532 nm and 780 nm, dispersive Raman microscopy with excitation laser of 532 nm and 100x magnifying lens, and Fourier Transform-Raman spectroscopy with excitation laser of 1064 nm were used for the analysis of four montmorillonites (Kunipia-F, SWy-2, STx-1b and SAz-2). These mineral standards differed mainly in the type of interlayer cation and substitution of octahedral aluminium by magnesium or iron. A comparison of measured Raman spectra of montmorillonite with regard to their level of fluorescence and the presence of characteristic spectral bands was carried out. Almost all measured spectra of montmorillonites were significantly affected by fluorescence and only one sample was influenced by fluorescence slightly or not at all. In the spectra of tested montmorillonites, several characteristic Raman bands were found. The most intensive band at 96 cm(-1) belongs to deformation vibrations of interlayer cations. The band at 200 cm(-1) corresponds to deformation vibrations of the AlO6 octahedron and at 710 cm(-1) can be assigned to deformation vibrations of the SiO4 tetrahedron. The band at 3620 cm(-1) corresponds to the stretching vibration of structural OH groups in montmorillonites.
Trvalý link: http://hdl.handle.net/11104/0260783