| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Dyar, M. Darby
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2023Wave vector and field vector orientation dependence of Fe <i>K</i> pre-edge X-ray absorption features in clinopyroxenescitations
- 2023Fe(III) (oxyhydr)oxide reduction by the thermophilic iron-reducing bacterium Desulfovulcanus ferrireducenscitations
- 2012Carbonate precipitation under bulk acidic conditions as a potential biosignature for searching life on Marscitations
- 2011Methods to analyze metastable and microparticulate hydrated and hydrous iron sulfate mineralscitations
- 2009Effect of SiO2, total FeO, Fe3+/Fe2+ and alkali elements in basaltic glasses on mid-infrared spectracitations
Places of action
| Organizations | Location | People |
|---|
article
Effect of SiO2, total FeO, Fe3+/Fe2+ and alkali elements in basaltic glasses on mid-infrared spectra
Abstract
<p>A suite of basaltic glasses were examined to determine how subtle compositional changes affect mid-infrared spectra (650 to 5400 cm<sup>-1</sup>). Glasses with different SiO<sub>2</sub>, FeO<sub>total</sub>, Fe <sup>3+</sup>/Fe<sup>2+</sup>, and alkali contents were synthesized in a gas-mixing furnace and analyzed using electron probe microanalysis, Mössbauer spectroscopy, and micro-reflectance Fourier transform infrared spectroscopy. The major mid-infrared spectral feature in silicate glasses is a broad peak located at ∼900 to 1100 cm<sup>-1</sup> arising from Si-(Al-)O asymmetric stretching vibrational modes. To accurately compare spectra of different glass compositions, we have applied the Kramers-Kronig (KK) transform to our spectra and examined the resulting absorption peak (KK abs. peak). The location of the KK abs. peak shifts to higher wavenumbers as SiO<sub>2</sub> content increases (1031-1054 cm<sup>-1</sup> with SiO<sub>2</sub> from 47.18 to 55.57 wt%). For basaltic glasses with near-constant Al/(A1+Si), the full-width half maximum of the KK abs. peak decreases as alkali content increases (235-188 cnr<sup>-1</sup> with Na<sub>2</sub>O+K<sub>2</sub>O contents from 0.07 to 3.74 wt%). In contrast, the location and shape of the KK abs. peak are not affected by variations in total FeO (6.06-16.30 wt%) and Fe<sup>3+</sup>/Fe<sup>2+</sup> (0.05-1.17). Our results show that KK transformed mid-infrared spectra of basaltic glasses may be used to determine the SiO<sub>2</sub> contents in basaltic glasses, irrespective of FeO<sub>total</sub> and Fe<sup>3+</sup>/ Fe<sup>2+</sup>, and the alkali contents if Al/(A1+Si) is known. These observations will aid in the interpretation of laboratory and remotely sensed IR spectra.</p>