Articles | Volume 34, issue 6
https://doi.org/10.5194/ejm-34-573-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-34-573-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Dec 2022
Research article |
| 09 Dec 2022
| 09 Dec 2022
Non-destructive determination of the biotite crystal chemistry using Raman spectroscopy: how far we can go?
Stylianos Aspiotis
CORRESPONDING AUTHOR
Fachbereich Erdsystemwissenschaften, Universität Hamburg,
Grindelallee 48, 20146 Hamburg, Germany
Jochen Schlüter
Museum der Natur Hamburg – Mineralogie, Leibniz-Institut zur Analyse des
Biodiversitätswandels (LIB), Grindelallee 48, 20146 Hamburg, Germany
Günther J. Redhammer
Fachbereich Chemie und Physik der Materialien, Paris-Lodron
Universität Salzburg, 5020 Salzburg, Austria
Boriana Mihailova
Fachbereich Erdsystemwissenschaften, Universität Hamburg,
Grindelallee 48, 20146 Hamburg, Germany
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By applying in situ high-temperature Raman spectroscopy to (OH)-- and Fe2+-bearing fluorophlogopite we show that a phonon-driven structural instability near 600 K triggers the mobilization of interlayer K+ cations, which can act as charge carriers. Above 1100 K all H+ cations delocalize and can also contribute to transport processes. Above 1300 K oxidation of Fe takes place, along with limited dehydrogenation and dehydroxylation, facilitating partial K+ leakage and structural decomposition.
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We provide a tool for fast preparation-free estimation of the Fe3+ content in Al–Fe3+ series epidotes by Raman spectroscopy. The peaks near 570, 600, and 1090 cm−1, originating from Si2O7 vibrations, strongly correlated with Fe content, and all three signals are well resolved in a random orientation. Among them, the 570 cm−1 peak is the sharpest and easily recognized. Hence, the linear trend, ω570 = 577.1(3) − 12.7(4)x, gives highly reliable Fe content, x, with accuracy ± 0.04 Fe3+ apfu.
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Short summary
Combined Raman-scattering and wavelength-dispersive electron microprobe (WD-EMP) analyses of natural biotites expanding over the whole biotite solid-solution series demonstrate that the chemical composition of the MO6 octahedra, TO4 tetrahedra, and interlayer space can be non-destructively determined by Raman spectroscopy with relative uncertainties below 8 %. The content of critical minor elements such as Ti at the octahedral site can be quantified as well with a relative error of ~ 20 %.
Combined Raman-scattering and wavelength-dispersive electron microprobe (WD-EMP) analyses of...
