Micro-Raman determination of iron redox state in dry natural glasses: Application to peralkaline rhyolites and basalts

Muro, Andréa Di; Métrich, Nicole; Mercier, Maxime; Giordano, Daniele; Massare, D.; Montagnac, Gilles

doi:10.1016/j.chemgeo.2008.08.013

Cited by 70 publications

(82 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[10,16,17,20,30,31] They suppose that the iron oxidation state potentially affects the Raman spectrum topology (particularly the stretching modes region ∼1000 cm −1 ) by assuming that Fe 3+ acts as a network former while Fe 2+ plays essentially the role of a network modifier. Some glasses show a marked evolution of the overall spectral topology with the iron redox state: an increase of the band in the Q 2 region with higher Fe 3+ contents, but others showing a low sensitivity to redox changes.…”

Section: Discussionmentioning

confidence: 99%

“…The broad stretching band indicates the effect of the iron concentration on the vitreous network [9,16] : A sharp intensity increase of the Q 2 species versus the Q 3 species with higher iron content is observed. In previous studies [16,19,23] on iron-bearing glasses, the Q 2 band at ∼980 cm −1 has been attributed to the antisymmetric coupled mode of Fe 3+ O 4 -SiO 4 tetrahedra.…”

Section: (A) and (B))mentioning

confidence: 99%

“…In previous studies [16,19,23] on iron-bearing glasses, the Q 2 band at ∼980 cm −1 has been attributed to the antisymmetric coupled mode of Fe 3+ O 4 -SiO 4 tetrahedra.…”

Section: (A) and (B))mentioning

confidence: 99%

See 2 more Smart Citations

Using Raman spectroscopy as a tool for the detection of iron in glass

Baert

Meulebroeck

Wouters

et al. 2011

J Raman Spectroscopy

View full text Add to dashboard Cite

Raman spectroscopy has been used to identify iron-containing glasses. This nondestructive technique offers a fast method to obtain qualitative information about the presence of iron oxides in glass. The effect of the iron content in glass samples is reflected on the topology of the Raman spectra: A strong link between the ratio of the Q 2 /Q 3 vibration units of the silica tetrahedral structure is seen. If matrix effects are taken into account, also (semi)quantitative results can be obtained from the calibration lines. The linear calibration is based on the normalized band intensity at 980 cm −1 (I 980 /I 1090 ) and the iron oxide concentration for similar glasses. In amber and dark colored glasses, an extra peak in the spectrum indicates the presence of a FeS chromophore. Different series of glasses of various origins (ancient and modern/industrial glass) have been considered.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: (A) and (B))mentioning

confidence: 99%

See 1 more Smart Citation

Using Raman spectroscopy as a tool for the detection of iron in glass

Baert

Meulebroeck

Wouters

et al. 2011

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…The depolymerisation reactions (4)-(6) will predominate in polymerised liquids, whereas reaction (8) will be dominant in depolymerised liquids, such that at NBO/T > 0.5 (SM $ 30) the governing mechanism is the polymerisation mechanism of reaction (8), as shown by the spectroscopic analysis of the same samples as measured here Di Muro et al, 2009). The stronger effect of water on the viscosity of polymerised melts can therefore be due to the higher abundance of AlOH and SiOH species, the absence of free OH and the overall stronger depolymerising effect of water.…”

Section: Hydrous Meltsmentioning

confidence: 94%

The rheological evolution of alkaline Vesuvius magmas and comparison with alkaline series from the Phlegrean Fields, Etna, Stromboli and Teide

Giordano¹,

Ardia

Romano³

et al. 2009

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…phonolites, trachytes, dacites, andesites) the I LF /I HF ratio decreases more smoothly (Di Muro et al, 2006b). In addition, the content of iron and the relative proportion between ferric and ferrous species can also affect the silicate melt properties, its structure and the Raman spectra topology (Mysen et al, 1980b;Kushiro, 1982;Lange and Carmichael, 1990;Wang et al, 1995;Magnien et al, 2006;Di Muro et al, 2008).…”

Section: Introductionmentioning

confidence: 94%

Influence of glass polymerisation and oxidation on micro-Raman water analysis in alumino-silicate glasses

Mercier

Muro

Giordano

et al. 2009

Geochimica et Cosmochimica Acta

Self Cite

103

View full text Add to dashboard Cite

International audienceThe development of an accurate analytical procedure for determination of dissolved water in complex alumino-silicate glasses via micro-Raman analysis requires the assessment of the spectra topology dependence on glass composition. We report here a detailed study of the respective influence of bulk composition, iron oxidation state and total water content on the absolute and relative intensities of the main Raman bands related to glass network vibrations (LF: not, vert, similar490 cm−1; HF: not, vert, similar960 cm−1) and total water stretching (H2OT: not, vert, similar3550 cm−1) in natural glasses. The evolution of spectra topology was examined in (i) 33 anhydrous glasses produced by the re-melting of natural rock samples, which span a very large range of polymerisation degree (NBO/T from 0.00 to 1.16), (ii) 2 sets of synthetic anhydrous basaltic glasses with variable iron oxidation state (Fe3+/FeT from 0.05 to 0.87), and (iii) 6 sets of natural hydrous glasses (CH2OT from 0.4 to 7.0 wt%) with NBO/T varying from 0.01 to 0.76. In the explored domain of water concentration, external calibration procedure based on the H2OT band height is matrix-independent but its accuracy relies on precise control of the focusing depth and beam energy on the sample. Matrix-dependence strongly affects the internal calibrations based on H2OT height scaled to that of LF or HF bands but its effect decreases from acid (low NBO/T, SM) to basic (high NBO/T, SM) glasses. Structural parameters such as NBO/T (non-bridging oxygen per tetrahedron) and SM (sum of structural modifiers) describe the matrix-dependence better than simple compositional parameters (e.g. SiO2, Na2O + K2O). Iron oxidation state has only a minor influence on band topology in basalts and is thus not expected to significantly affect the Raman determinations of water in mafic (e.g. low SiO2, iron-rich) glasses. Modelling the evolution of the relative band height with polymerisation degree allows us to propose a general equation to predict the dissolved water content in natural glasses: View the MathML source where CH2OT is the total water content (in wt%) dissolved in glass; TOTN represents the computed ILF/IHF variation as a function of the calculated NBO/T and SM parameters; IH2ON is the H2O band height scaled to ratio of the reference bands; k is the linearity spectrometer response on the H2OT band in function of water content. The water concentrations of the reference glasses are reproduced using this equation with a standard deviation of 0.06 wt%. The adopted parameterisation provides a useful tool towards the characterisation of composition dependence of micro-Raman procedures for silicate glasses. We show, based on the widest range of glass compositions so far investigated, that accurate evaluation of dissolved water content is achieved by micro-Raman spectroscopy

show abstract

Micro-Raman determination of iron redox state in dry natural glasses: Application to peralkaline rhyolites and basalts

Cited by 70 publications

References 60 publications

Using Raman spectroscopy as a tool for the detection of iron in glass

Using Raman spectroscopy as a tool for the detection of iron in glass

The rheological evolution of alkaline Vesuvius magmas and comparison with alkaline series from the Phlegrean Fields, Etna, Stromboli and Teide

Influence of glass polymerisation and oxidation on micro-Raman water analysis in alumino-silicate glasses

Contact Info

Product

Resources

About