An IR absorption calibration for water in minerals

Libowitzky, Eugen; Rossman, George R.

doi:10.2138/am-1997-11-1208

Cited by 431 publications

(285 citation statements)

References 19 publications

Supporting

Mentioning

256

Contrasting

Unclassified

Order By: Relevance

“…The large uncertainty in the absorption coefficient given by Katayama et al (2006) . The absorption value determined in this study of ε i,tot = 65000 ± 3000 lmol H2O -1 cm -2 is in good agreement with absorption coefficients of cpx and opx given by Bell et al (1995), if we take into account the frequency dependence of the absorption coefficient: absorption coefficient trends of OH in hydrous minerals (Paterson, 1982 andLibowitzky andRossman, 1997) are based on a negative correlation between the IR absorption coefficient for water and the mean wavenumber of the corresponding OH pattern. From this relation we expect for the omphacites investigated by Katayama et al (2006) a lower value as given by them because the mean wavenumber of band positions of their omphacites is higher than in ours.…”

Section: Discussionsupporting

confidence: 82%

Dehydration experiments on natural omphacites: qualitative and quantitative characterization by various spectroscopic methods

et al. 2007

View full text Add to dashboard Cite

Originally published as:Koch-Müller, M., Abs-Wurmbach, I., Rhede, D., Kahlenberg, V., Matsyuk, S. (2007) AbstractA series of natural omphacites from a wide range of P, T occurrences were investigated by electron microprobe (EMP), infrared (IR)-, Mössbauer (MS)-and optical spectroscopy in the UV/VIS spectral range (UV/VIS), secondary ion mass spectrometry (SIMS) and single crystal structure refinement by X-ray diffraction (XRD) to study the influence of hydrogen loss on valence state and site occupancies of iron. In accordance with literature data we found Fe 2+ at M1 as well as at M2, and in a first approach assigned Fe 3+ to M1, as indicated by MS and XRD results. Hydrogen content of three of our omphacite samples were measured by SIMS. In combination with infrared spectroscopy we determined an absorption

show abstract

Section: Discussionsupporting

confidence: 82%

Dehydration experiments on natural omphacites: qualitative and quantitative characterization by various spectroscopic methods

et al. 2007

View full text Add to dashboard Cite

show abstract

“…For hydrous minerals and glasses ε−values can be taken from the general calibrations published by, e.g. Paterson (1982), or Libowitzky andRossman (1997). However, it has been shown that these values should not be applied to water quantification in nominally anhydrous minerals (NAMs); NAMs need mineral-specific ε−values (e.g.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Water and Iron effect on the P-T-x coordinates of the 410-km discontinuity in the Earth upper mantle

Deon

Koch‐Müller

Rhede

et al. 2010

Contrib Mineral Petrol

View full text Add to dashboard Cite

We performed multi-anvil experiments in the system MgO-SiO 2 ± H 2 O at 13.0-13.7 GPa and 1,025-1,300°C and in the system MgO-FeO-SiO 2 ± H 2 O, under reducing conditions, at 11.0-12.7 GPa and 1200°C, to depict the effect of H 2 O on the P-T-x coordinates of the 410-km discontinuity, i.e. the olivine-wadsleyite phase boundary. The charges were investigated with where wad-ring and ol-ring coexist, we observe, however, an unexpected broadening of the loops with a shift to higher iron contents. In total the stability field of hydrous wad expands in both directions, to lower and higher pressures. Fe 3+ concentrations as determined by EELS are very low and are expected to play no role in the broadening of the loops.

show abstract

“…k H2O = 1.8 (Beran et al, 1993) and k CO2 = 4.401 (Della Ventura et al, 2009, 2012 were used to convert H 2 O and CO 2 , respectively, from mol·l −1 to wt.%. The critical point in the Lambert-Beer equation is the integral molar absorption coefficient, ε, which is matrix-dependent and needs to be calibrated for the mineral under investigation; alternatively it can be derived from empirical curves such as the one proposed by Libowitzky and Rossman (1997). For beryl, ε H2O values are available in the literature, however their use is complicated by the fact that H 2 O occurs in two different molecular configurations, which absorb the IR beam at different wavenumbers.…”

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

confidence: 99%

“…In addition, previous authors have used either integrated or linear absorbance data, thus it is difficult to compare results from different methods. 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).…”

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

confidence: 99%

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

et al. 2015

View full text Add to dashboard Cite

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 .

show abstract

An IR absorption calibration for water in minerals

Cited by 431 publications

References 19 publications

Dehydration experiments on natural omphacites: qualitative and quantitative characterization by various spectroscopic methods

Dehydration experiments on natural omphacites: qualitative and quantitative characterization by various spectroscopic methods

Water and Iron effect on the P-T-x coordinates of the 410-km discontinuity in the Earth upper mantle

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

Contact Info

Product

Resources

About