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No site-specific infrared absorption coefficients for OH-defects in pure enstatite

Roland Stalder, Felix Prechtel and Thomas Ludwig
No site-specific infrared absorption coefficients for OH-defects in pure enstatite
European Journal of Mineralogy (June 2012) 24 (3): 465-470

Abstract

Single crystals of pure Mg (sub 2) Si (sub 2) O (sub 6) orthoenstatite synthesized at 25-80 kbar were analysed by secondary ion mass spectrometry (SIMS) and Fourier transform infrared spectroscopy (FTIR) with respect to water. The IR spectra of the crystals exhibited two groups of OH-absorption bands in varying proportions, ascribed to a varying ratio of two different OH-defects. Different strategies for quantification of the water content based on the comparison of the IR spectra and the SIMS data are evaluated. Results suggest that one single mineral-specific absorption coefficient for enstatite is not useful, and that site-specific absorption coefficients (i.e., coefficients specific to each absorption band) are not necessary. Instead, a function for the absorption coefficient dependence on wavelength could be established. This function is similar to previously formulated wavelength-dependent absorption coefficients for nominally anhydrous minerals, hydrous minerals and water-bearing glasses.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 24
Serial Issue: 3
Title: No site-specific infrared absorption coefficients for OH-defects in pure enstatite
Affiliation: Universitaet Innsbruck, Institut fuer Mineralogie und Petrographie, Innsbruck, Austria
Pages: 465-470
Published: 201206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 22
Accession Number: 2012-056720
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Universitaet Heidelberg, DEU, Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201229
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