In: Mineralogical Magazine, 2011, vol. 75, no. 3, p. 2031
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In: Physics and Chemistry of Minerals, 2014, vol. 41, no. 3, p. 197-214
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Thèse de doctorat : Université de Fribourg, 2013 ; Nr. 1795.
Chemical reactions in general and solid-state reactions in particular are controlled by thermodynamics and kinetics. Whereas thermodynamic rules are used to state whether a phase is stable under a specific set of intensive and extensive parameters or not, kinetics applied to an underlain reaction of interest decipher the time-scale of such a reaction by offering the chance to determine associated...
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In: Physics and Chemistry of Minerals, 2014, vol. 41, no. 3, p. 197–214
The dehydroxylation reactions of chrysotile Mg₃Si₂O₅(OH)₄ and brucite Mg(OH)₂ were studied under inert nitrogen atmosphere using isothermal and non-isothermal approaches. The brucite decomposition was additionally studied under CO₂ in order to check the influence of a competing dehydroxylation/carbonation/decarbonisation reaction on the reaction kinetics. Isothermal experiments...
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In: American Mineralogist, 2013, vol. 98, no. 7, p. 1133–1145
One of the most important mechanisms releasing water in subducting slabs of oceanic crust is connected to the dehydration of serpentinized oceanic rocks. This study reports on a detailed investigation of the transition from chrysotile—an important serpentine mineral—to forsterite through the release of water.The dehydroxylation of natural chrysotile and the subsequent phase change to...
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In: American Mineralogist, 2012, vol. 97, no. 11-12, p. 1965-1976
A temperature-dependent in situ micro-FTIR and micro-Raman spectroscopic investigation was performed on powdered (FTIR, Raman) and single-crystal (Raman) lizardite-1T samples between room temperature and 819 °C. Between room temperature and 665 °C, the OH stretching bands shift to lower wavenumbers, demonstrating a weak expansion of the O3-H3…O2 interlayer distance. Band...
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In: European Journal of Mineralogy, 2012, vol. 24, no. 1, p. 47-57
The thermally induced dehydroxylation of lizardite and its phase transformation to forsterite were studied by high-temperature X-ray diffraction (HT-XRD), thermogravimetry (TGA) and Fourier-transformed infrared spectroscopy (FTIR). Primary sample characteristics like chemical composition and crystallographical structure were determined by combined (HR)TEM-EDX, electron-microprobe analyses...
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In: Zentralblatt für Geologie und Paläontologie Teil 1, 2010, p. 139-156
Gegenstand der Untersuchung war die geomorphologische und sedimentäre Aufnahme und Untergliederung diverser Deflationsoberflächen und Kalkkrustengenerationen im Bereich der Langer Heinrich Uran Mine/Namibia. Neben der vor Ort durchgeführten Auswertung von Klastenspektren via Zählverfahren kamen analytische Methoden zur Bestimmung der Zementzusammensetzung und der Tonmineralassoziation,...
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