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Article Abstract
The mechanism of hydration of calcium sulfate hemihydrate (CaSO·0.5HO) to form gypsum (CaSO·2HO) was studied by combining scanning 3D X-ray diffraction (s3DXRD) and phase contrast tomography (PCT) to determine the spatial and crystallographic relationship between these two phases. From s3DXRD measurements, the crystallographic structure, orientation and position of the crystalline grains in the sample during the hydration reaction were obtained, while the PCT reconstructions allowed visualization of the 3D shapes of the crystals during the reaction. This multi-scale study unfolds structural and morphological evidence of the dissolution-precipitation process of the gypsum plaster system, providing insights into the reactivity of specific crystallographic facets of the hemihydrate. In this work, epitaxial growth of gypsum crystals on the hemihydrate grains was not observed.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10241062 | PMC |
| http://dx.doi.org/10.1107/S1600576723002881 | DOI Listing |
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