Abstract
The article shows how additional information can be obtained from coupling a self constructed DTA-system with a commercially available BRUKER D8 DISCOVER GADDS XRD2-microdiffractometer. The dehydration process of gypsum to anhydrite in the temperature range from room temperature up to 723 K is used as an example. Due to the short measurement times of 10 s for each diffraction pattern the three phase transformations from gypsum to anhydrite (anhydrite II) via the hemihydrate bassanite, a water-free bassanite structure (γ-anhydrite, anhydrite III) were resolved in detail by recording the thermal signal and the diffraction pattern simultaneously. To the best of our knowledge, this is the first observation of a completely reversible dehydration/rehydration process of the bassanite/γ-anhydrite-structure around 373 K which is studied by coupled XRD and differential thermal analysis (DTA) measurements.
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