Editorial for the Special Issue “Modern Raman Spectroscopy of Minerals”

Abstract

Raman spectroscopy provides vibrational fingerprints of chemical compounds, enabling their unambiguous identification [...]

Electrical characteristics of different concentration of silica nanoparticles embedded in epoxy resin

“…Figure 5 illustrates that the epoxide ring vibration band is located at 1452 cm −1 [6,22] , while the epoxide's vibrations are represented by Raman bands ranging from 1230 cm −1 to 1280 cm −1 , these bands overlap other bands, -C-O-C-ether stretch at 1232 cm −1 and the aromatic C-H stretch at 3065 cm −1 [23,24]. In addition to these bands, the symmetric CH 2 stretching band at 2875 cm −1 , associated with the formed link between the amine and epoxy, increases in intensity as the reaction proceeds [24], while the symmetric terminal epoxide =CH 2 stretch at 3010 cm −1 disappears as the cure reaction proceeds [24,25].…”

“…In addition to these bands, the symmetric CH 2 stretching band at 2875 cm −1 , associated with the formed link between the amine and epoxy, increases in intensity as the reaction proceeds [24], while the symmetric terminal epoxide =CH 2 stretch at 3010 cm −1 disappears as the cure reaction proceeds [24,25]. Raman peaks at wavelengths of 1112 cm −1 and 1608 cm −1 can be used to identify the resin backbone (phenyl band) vibrations [22]. Moreover, the C-H out-of-plane bending of the para-disubstituted phenyl group at 638 and 830 cm −1 [24,25].…”

Thermal Kinetics and Nitriding Effect of Ammonia-Based Direct Reduction of Iron Oxides

“…Raman spectroscopy identification of minerals and spectral fitting was performed based on the specific spectral patterns of the individual mineral type, chemical composition, and polymorphic form. 24 The identification of these minerals was correlated with the Raman spectroscopic database library RRUFF. 25 X-ray Photoelectron Spectroscopy.…”

“…The data was accumulated during several measurement series with an accumulation time of 3600 s and a spectral resolution of roughly 1 cm –1 . Raman spectroscopy identification of minerals and spectral fitting was performed based on the specific spectral patterns of the individual mineral type, chemical composition, and polymorphic form . The identification of these minerals was correlated with the Raman spectroscopic database library RRUFF …”

Raman imaging of Micrasterias: new insights into shape formation

“…The in situ capability of Raman microspectroscopy gives the unique possibility to study minerals within plant tissues (e.g., Dietrich et al 2002;Gierlinger et al 2008;Joester et al 2017;Soukup et al 2017;Weigend et al 2018) and inside algae (e.g., Barcytė et al 2020;Niedermeier et al 2018). In addition to the chemical identity of minerals, Raman spectra are affected by crystal orientations (varying relative Raman band intensities), (sub) stoichiometric compositional changes (e.g., in solid solution series), traces of foreign ions, strain (the latter three shifting Raman bands), and crystallinity (changing Raman band widths), enabling comprehensive physicochemical characterization of minerals (Schmid and Dariz 2020). Based on the strong and sharp Raman bands at 986 cm −1 , 615 cm −1 , and 452 cm −1 (Fig.…”