Micro X-ray absorption near edge structure at the sulfur and iron K-edges in natural silicate glasses

“…The peak at 2482.1 eV is characteristic of the 1s ? 3p transition of the sulfate group (Li et al, 1995;Bonnin-Mosbah et al, 2002;Fleet et al, 2005).…”

Section: Sulfur Species In Experimental Glassesmentioning

confidence: 99%

The oxidation state of sulfur in synthetic and natural glasses determined by X-ray absorption spectroscopy

Métrich

Berry

O’Neill

et al. 2009

Geochimica et Cosmochimica Acta

144

103

View full text Add to dashboard Cite

“…As expected, the NBS standard glass made by melting in air shows only sulfate. Taking advantage of the enhanced brightness of a third-generation source at the European Synchrotron Radiation Facility (ESRF; Grenoble) and recent developments in beamline technology, Bonnin-Mosbah et al (2002) and Métrich et al ( , 2003 obtained S K-edge XANES spectra for glass inclusions in olivine from basaltic rocks, selected to cover a range of different volcanic zones and redox conditions, and including ocean-island basalt, back-arc basalt and mid-ocean-ridge basalt. The glass inclusions are about 100 m in size and have S contents of 0.100 to 0.165 wt.%.…”

Section: Oxyanions Of Sulfurmentioning

confidence: 99%

“…2). Therefore, Bonnin-Mosbah et al (2002) suggested that S 4+ (as SO 3 2-or SO 2 ) might occur in natural silicate glasses. In subsequent studies, Métrich et al (2002Métrich et al ( , 2003 proposed that S 4+ is the important intermediate species for the degassing of excess S in oxidized and H 2 O-rich basaltic arc volcanoes.…”

Section: Oxyanions Of Sulfurmentioning

confidence: 99%

Xanes Spectroscopy of Sulfur in Earth Materials

Fleet¹

2005

The Canadian Mineralogist

152

134

View full text Add to dashboard Cite

X-ray absorption near-edge structure (XANES) spectroscopy is the ideal non-destructive technique for characterizing and quantifying S species in compositionally complex natural materials such as silicate glasses and minerals, coals, asphalts and asphaltenes, kerogens and humic substances. Sulfur absorption edges represent the transition of S 1s and 2p core electrons to unoccupied antibonding orbitals at the bottom of the conduction band. Shifts in the position of the absorption-edge feature of S K-and L-edge XANES spectra constitute a chemical ruler for oxidation state of both inorganic and organic species of S; the S K edge shifts from 2469.5 eV for chalcopyrite (2-oxidation state) to 2482 eV for gypsum (6+). However, chemical state of S in Earth materials is most readily assigned by comparing the overall XANES profi le with spectra for reference compounds. Sulfur XANES spectra are reviewed for pyrite, troilite, pyrrhotite and NiAs-type Co 0.923 S and Ni 0.923 S, niningerite (MgS), oldhamite (CaS), alabandite (MnS) and cubic FeS, and sphalerite and related phases, as well as for selected solid-solutions of the monosulfi des. Sulfur XANES spectra for FeS, CoS, NiS, MgS, CaS, MnS and ZnS have been simulated by multiple scattering calculations. The S K-edge XANES of transition-metal-bearing monosulfi des generally show anomalous absorption consistent with hybridization of the fi nal S 3p * antibonding states with empty 3d orbitals on the metal atoms. Various applications of S K-and L-edge XANES fi ngerprinting are discussed, including speciation of inorganic S in basaltic glasses, lazurite and haüyne, identifi cation of organic functional groups of S in coals, kerogens and humic substances extracted from subtropical soils and marine sediments, and the association of sulfated sugars with calcifi cation of coral aragonite skeletons.Keywords: XANES spectroscopy, chemical state of S, electronic structure and bonding, sulfi des, sulfates, magma, organic geochemistry. SOMMAIRELa spectroscopie d'absorption des rayons X dans la région pré-seuil (XANES) s'avère la technique non-destructive par excellence pour caractériser et quantifi er les espèces de soufre dans les matériaux naturels de composition complexe, par exemple les verres silicatés et minéraux, charbons, asphaltes et asphaltènes, kérogènes et substances humiques. Les seuils d'absorption du soufre résultent de la transition des électrons 1s et 2p du noyau à des orbites non occupés anti-liaisons à la base de la bande de conduction. Les décalages dans la position des seuils K et L du soufre des spectres XANES constituent un barème chimique important dans l'évaluation du niveau d'oxydation du soufre, à la fois pour les espèces inorganiques et organiques; le seuil K est déplacé de 2469.5 eV dans la chalcopyrite (valence 2-) à 2482 eV dans le gypse (6+). Toutefois, l'état du soufre des matériaux terrestres est plus facilement attribué en comparant le profi l XANES entier d'un échantillon aux spectres des composés de réfé-rence. Les spectres XANES du soufre so...

show abstract

“…The high spatial resolution focusing, combined with spectroscopic methods in the multi-keV range, has been demonstrated in a number of experiments from diverse fields. Sulfur [8][9][10], Calcium [11], Vanadium [12], Chromium [13], and Iron [14] K-edges are the most requested edges/lines. The reduction of air absorption by using the scanning microscope in secondary vacuum is a clear asset for energies below 4 keV.…”

Section: Esrf-id2x-ray Microscopy Beamlinementioning

confidence: 99%

Synchrotron X-Ray Microfluorescence and Microspectroscopy: Application and Perspectives in Materials Science

Bohic

Simionovici

Biquard³

et al. 2005

Oil & Gas Science and Technology - Rev. IFP

View full text Add to dashboard Cite

Micro X-ray absorption near edge structure at the sulfur and iron K-edges in natural silicate glasses

Cited by 62 publications

References 25 publications

The oxidation state of sulfur in synthetic and natural glasses determined by X-ray absorption spectroscopy

The oxidation state of sulfur in synthetic and natural glasses determined by X-ray absorption spectroscopy

Xanes Spectroscopy of Sulfur in Earth Materials

Synchrotron X-Ray Microfluorescence and Microspectroscopy: Application and Perspectives in Materials Science

Contact Info

Product

Resources

About