Channel occupancy in an alkali-poor beryl from Serra Branca (Goias, Brazil); spectroscopic characterization

Charoy, B.; Donato, Philippe de; Barrès, Odile; Pinto-Coelho, Cristina Valle

doi:10.2138/am-1996-3-414

Cited by 92 publications

(102 citation statements)

References 18 publications

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“…18 -left, first spectrum) additional very weak band at 3697 cm -1 (A-notation) is defined [24]. Such a spectral view is a strong indication about the dominant presence of one type of H 2 O molecules in the existing channels along the c-axis in beryl structure [25,26]. Namely, type I H 2 O molecules (arranged so that the symmetry axis of the molecule is perpendicular to the channel axis and typical for alkali-free beryls), represented by the bands in 3690-3699 cm -1 and 3629-3650 cm -1 regions (see Table 4 in ref.…”

Section: Ferojohannsenite Ca(femn)si 2 Omentioning

confidence: 99%

MINERALS FROM MACEDONIA. X-RAY POWDER DIFFRACTION vs. VIBRATIONAL SPECTROSCOPY IN MINERAL IDENTIFICATION

Jovanovski¹,

Makreski²,

Kaitner³

et al. 2017

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Section: Ferojohannsenite Ca(femn)si 2 Omentioning

confidence: 99%

MINERALS FROM MACEDONIA. X-RAY POWDER DIFFRACTION vs. VIBRATIONAL SPECTROSCOPY IN MINERAL IDENTIFICATION

Jovanovski¹,

Makreski²,

Kaitner³

et al. 2017

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“…Based on the literature data (Wood and Nassau, 1967;Charoy et al, 1996;Kolesov and Geiger, 2000;Gatta et al, 2006;Della Ventura et al, 2007;Adamo et al, 2008;Bellatreccia et al, 2008) the former peak is assigned to the ν 3 mode of H 2 O [I] , while the latter peak is assigned to the ν 1 mode of H 2 O [II] . In the same range, the E⊥c spectrum consists of a very broad multicomponent absorption with maxima at 3724, 3675, and 3605, and a shoulder around 3591 cm −1 ; pertinent to the following discussion is the 3675 cm −1 band (arrowed in Figure 4), assigned to the ν 3 mode of H 2 O [II] (Wood and Nassau, 1967;Charoy et al, 1996).…”

Section: Polarized-light Ftir Spectra Band Assignment and Volatile mentioning

confidence: 99%

“…In the same range, the E⊥c spectrum consists of a very broad multicomponent absorption with maxima at 3724, 3675, and 3605, and a shoulder around 3591 cm −1 ; pertinent to the following discussion is the 3675 cm −1 band (arrowed in Figure 4), assigned to the ν 3 mode of H 2 O [II] (Wood and Nassau, 1967;Charoy et al, 1996). In the 2600-2000 cm −1 range, the very sharp and asymmetric peak centered at 2360 cm −1 for E⊥c is assigned to the ν 3 mode of CO 2 (Wood and Nassau, 1967;Charoy et al, 1996); in the same range the E//c spectrum is featureless, in agreement with the fact that the CO 2 molecule is aligned normal to the c-axis (Charoy et al, 1996, see also Figure 1). …”

Section: Polarized-light Ftir Spectra Band Assignment and Volatile mentioning

confidence: 99%

“…We give in Table 2 the contents derived using both the ε H2O coefficients calculated from the curve of Libowitzky and Rossman (1997) for H 2 O [I] and H 2 O [II] , independently, and the ε H2O values given by Charoy et al (1996) and Goldman et al (1977), as proposed by Fukuda et al (2009). Table 2 gives also the CO 2 content calculated using the ε value recalculated after Charoy et al (1996). The error σ C associated with C was obtained according to Bellatreccia et al (2005).…”

Section: Polarized-light Ftir Spectra Band Assignment and Volatile mentioning

confidence: 99%

“…b Linear absorbance data, ε l (l·mol −1 ·cm −1 ) from Charoy et al (1996). c Linear absorbance data, ε l from Goldman et al (1977).…”

Section: Polarized-light Ftir Spectra Band Assignment and Volatile mentioning

confidence: 99%

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FTIR imaging in diffusion studies: CO2 and H2O in a synthetic sector-zoned beryl

et al. 2015

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In this work we investigate the strongly inhomogeneous distribution of CO 2 and H 2 O in a synthetic beryl having a peculiar hourglass zoning of Cr due to the crystal growth. The sample was treated at 800 • C, 500 MPa, in a CO 2 -rich atmosphere. High-resolution FESEM images revealed that the hourglass boundary is not correlated to physical discontinuities, at least at the scale of tens of nanometers. Polarized FPA-FTIR imaging, on the other side, revealed that the chemical zoning acts as a fast pathway for carbon dioxide diffusion, a feature never observed so far in minerals. The hourglass zone boundary may be thus considered as a structural defect possibly due to the mismatch induced by the different growth rates of each sector. High-resolution synchrotron-light FTIR imaging, in addition, also allows enhancement of CO 2 diffusion along the hourglass boundary to be distinguished from diffusion along fractures in the grain. Therefore, FTIR imaging provides evidence that different diffusion mechanisms may locally combine, suggesting that the distribution of the target molecules needs to be carefully characterized in experimental studies. This piece of information is mandatory when the study is aimed at extracting diffusion coefficients from analytical profiles. Combination of TOF-SIMS and FPA data shows a significant depletion of type II H 2 O along the hourglass boundary, indicating that water diffusion could be controlled by the distribution of alkali cations within channels, coupled to a plug effect of CO 2 .

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Applications of Vibrational Spectroscopy to Geology

Gillet

2001

Handbook of Vibrational Spectroscopy

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The sections in this article are Introduction Vibrational Spectra of Minerals, Glasses and Fluids: Basic Aspects Minerals: The Example of Carbonates Glasses: The Example of Si O 2 Fluids Micro‐ R aman and Micro‐Infrared Spectroscopy Micro‐ R aman Spectroscopy Micro‐Infrared Spectroscopy Vibrational Spectroscopy of Minerals at High Pressure and Temperature The Diamond Anvil Cell Vibrational Spectroscopy at Elevated Temperatures Some Examples in the Si O 2 System From Vibrational Spectra of Minerals to Thermodynamic Properties Spectroscopic Data for Some Representative Mineral Groups Simple Minerals: Diamond, Graphite, Alkali Halides, Mg O , Ti O 2 and Simple Hydrous Phases Si O 2 Polymorphs and Glass Orthosilicates Feldspars, Feldspathic Glasses and Other Framework Aluminosilicates Chain Silicates: Pyroxenes and Amphiboles Sheet Silicates: Micas, Clays and Serpentines Pyrosilicates Ring Silicates Corundum and Ilmenite Perovskites Spinels Carbonates Phosphates Sulfates and Sulfides Conclusion Acknowledgments

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Channel occupancy in an alkali-poor beryl from Serra Branca (Goias, Brazil); spectroscopic characterization

Cited by 92 publications

References 18 publications

MINERALS FROM MACEDONIA. X-RAY POWDER DIFFRACTION vs. VIBRATIONAL SPECTROSCOPY IN MINERAL IDENTIFICATION

MINERALS FROM MACEDONIA. X-RAY POWDER DIFFRACTION vs. VIBRATIONAL SPECTROSCOPY IN MINERAL IDENTIFICATION

FTIR imaging in diffusion studies: CO2 and H2O in a synthetic sector-zoned beryl

Applications of Vibrational Spectroscopy to Geology

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