Carbon oxides in cordierite channels: Determination of CO2 isotopic species and CO by single crystal IR spectroscopy

Khomenko, V. M.

doi:10.2138/am.2005.1963

Cited by 26 publications

(15 citation statements)

References 13 publications

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“…Moreover, the deconvolved peak area for the 2275 cm −1 band (0.0679 cm −1 in Fig. 2) is approximately 2% that of the 2340 cm −1 feature (2.9936 cm −1 ), roughly in line with the natural 13 C occurrence of 1.11% [30] and also consistent with results from a previous study on structural CO 2 in cordierite [18]. In that research, ratios for band areas of 3 ( 13 CO 2 )/ 3 ( 12 CO 2 ) ranged from 1.1 to 4.25%.…”

Section: The Assignment Of the 2340 CM −1 Bandsupporting

confidence: 89%

“…Overlapping bands in the region of the 2340 cm −1 feature were deconvolved by Omnic 7.1a software using a previously reported protocol [18]. A peak finding algorithm based on a Savitsky-Golay second derivative function was first applied to a high quality spectrum (512 scans) to establish the number and peak locations of component bands.…”

Section: Methodsmentioning

confidence: 99%

“…FTIR studies have revealed the 3 mode of trapped CO 2 in beryl [26], cordierite [18,26], farneseite [27], pitiglianoite [28], vishnevite [29], nosean [13], hauyne [13], and very rarely sodalite [13]. Importantly, the last three minerals are all potential components of lapis lazuli and are structurally very similar to lazurite.…”

Section: The Assignment Of the 2340 CM −1 Bandmentioning

confidence: 99%

“…Several studies have revealed a smaller associated spectral feature at lower wavenumber attributed to adsorbed or enclathrated 13 CO 2 [18,22,24,25]. The expected 13 C isotopic shift for the asymmetric stretch of CO 2 can be calculated by comparing ( 12 CO 2 )/( 13 CO 2 ) using the oscillator approximation where is the oscillator strength, m C is the mass of the appropriate carbon isotope, and m O is the mass of oxygen: The ratio ( 12 CO 2 )/( 13 CO 2 ) is calculated to be 1.029, yielding an expected 3 ( 13 CO 2 ) at 2275 cm −1 when 3 ( 12 CO 2 ) is observed at 2340 cm −1 .…”

Section: The Assignment Of the 2340 CM −1 Bandmentioning

confidence: 99%

“…These calculations must be taken as approximate, however, since the peak envelope at 2340 cm −1 shows significant asymmetry, requiring the fitting of at least four bands for complete convergence. This asymmetry has been ascribed elsewhere to a number of possibilities including multiple interaction sites for the CO 2 species within the aluminosilicate substrate [22], librational sum and difference modes of the 3 vibration coupled to a hindered rotation [26] or translation [22] of the molecule, and even a small contribution from the 18 O isotope-shifted 3 band, which is only clearly resolved in low temperature studies [18]. Furthermore, Khomenko and Langer [18] note that the molar absorptivity of the two isotopic forms of CO 2 are not necessarily the same within the sodalite cage, and hence comparison of relative band intensities is liable to be non-quantitative with regard to the isotopic composition.…”

Section: The Assignment Of the 2340 CM −1 Bandmentioning

confidence: 99%

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The presence of trapped carbon dioxide in lapis lazuli and its potential use in geo-sourcing natural ultramarine pigment

Smith

Klinshaw

2009

Journal of Cultural Heritage

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Section: The Assignment Of the 2340 CM −1 Bandsupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: The Assignment Of the 2340 CM −1 Bandmentioning

confidence: 99%

Section: The Assignment Of the 2340 CM −1 Bandmentioning

confidence: 99%

Section: The Assignment Of the 2340 CM −1 Bandmentioning

confidence: 99%

See 3 more Smart Citations

The presence of trapped carbon dioxide in lapis lazuli and its potential use in geo-sourcing natural ultramarine pigment

Smith

Klinshaw

2009

Journal of Cultural Heritage

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Raman spectroscopy of natural cordierite at high water pressure up to 5 GPa

Likhacheva

Goryaĭnov

Крылов

et al. 2011

J Raman Spectroscopy

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The high‐pressure behaviour of cordierite, a widespread ring aluminosilicate with channels incorporating fluid compounds (H2O, CO2), is characterized by the absence of phase transitions up to 2.5 GPa. However, the distortion of the ring tetrahedra observed previously at 2.3 GPa is supposed to introduce a phase transition at higher pressure, which has not been checked so far. This work presents a high‐pressure Raman spectroscopic study of natural cordierite compressed in water medium up to 4.7 GPa in a diamond anvil cell. At P > 4 GPa, a disordering of both the framework and intrachannel H2O subsystem is apparent from significant broadening of Raman peaks and the evolution of short‐range order parameters. This is followed by abrupt shifts of the framework and O–H stretching modes at about 4.5 GPa, indicating a first‐order phase transition. Its reversibility is seen from the recovery of the initial spectrum at P < 3 GPa. The shift amplitudes of different framework modes indicate the predominance of distortion over contraction of the framework polyhedra upon this transition. The disordering of the H2O subsystem in the high‐pressure phase is likely a consequence of distortion of the channel‐forming framework elements, which is supposed to be a driving force of this transition. Copyright © 2011 John Wiley & Sons, Ltd.

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Raman, FT‐IR and XRD investigation of natural opals

Sodo

Municchia

Barucca

et al. 2016

J Raman Spectroscopy

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Opals are naturally occurring hydrous silica materials (SiO2*nH2O), characterized by different degrees of crystallinity and crystal structure. Because of their optical properties, opals have been largely used in jewelry and as decorative elements in artworks. For this reason, a complete characterization and a provenance study of this kind of materials is mandatory in order both to avoid frauds and to reconstruct ancient and modern trade routes of gems. In this work, we present a combined spectroscopic (Raman, FTIR) and X-ray powder diffraction (XRD) investigation of nine opals from the main deposits around the world (Australia, Madagascar, Slovakia, Mexico, Honduras and Ethiopia). Four of these samples are the rare and precious fire opals, characterized by an intense red-orange color. Ethiopia, Honduras and Mexico opals showed spectra and diffraction patterns typical of Opal-CT, generally associated to volcanic genesis, while Australia, Madagascar and Slovakia opals are Opal-A type, associated to sedimentary origin. Unexpectedly the fire opal from Brazil behaves as a CT one. The presence of CO2 was detected only in the latter group, and exceptionally in the Honduras sample; FTIR-FPA imaging showed carbon dioxide to be homogeneously distributed inside the gems. Opals-CT are CO2-free and give much more complex FT-IR spectra in the NIR region where H2O combination modes occur. The obtained results are discussed in terms of relevance of the above experimental techniques for geosourcing opals, and contribute to increase the database of the chemical-physical properties of opals

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Carbon oxides in cordierite channels: Determination of CO2 isotopic species and CO by single crystal IR spectroscopy

Cited by 26 publications

References 13 publications

The presence of trapped carbon dioxide in lapis lazuli and its potential use in geo-sourcing natural ultramarine pigment

The presence of trapped carbon dioxide in lapis lazuli and its potential use in geo-sourcing natural ultramarine pigment

Raman spectroscopy of natural cordierite at high water pressure up to 5 GPa

Raman, FT‐IR and XRD investigation of natural opals

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