|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Materials through High Resolution Coherent Imaging
||Phase Contrast Tomography to Document Gypsum Dehydration in Single Crystals and Polycrystalline Materials
||Florian Fusseis, Xianghui Xiao, John Bedford, Henri Leclere
|On-Site Speaker (Planned)
Gypsum (CaSO4.2H2O) is one of the most abundant naturally occurring sulphates and of immense significance for several research communities, ranging from construction materials, trough artifact preservation to tectonic processes. At the core of most research is the dehydration path of gypsum upon heating, from gypsum to hemihydrate (CaSO4.1/2H2O) then anhydrite (CaSO4). Despite a century worth of research, key aspects of the dehydration process are still poorly understood. For the first time, we used synchrotron-based phase contrast microtomography to document the hemihydrate formation during the dehydration of gypsum in situ. Our 4D data comprise several tens of time steps and capture the advance of the reaction in sufficient detail to determine the reaction rate and identify the key parameters governing reaction advance. the new data not only advances our understanding of this ubiquitous material significantly but also outlines a novel direction in the study of chemical reactions.
||Planned: Supplemental Proceedings volume