On the monoclinic distortion of β-anhydrite CaSO4
Abstract
β-anhydrite, the stable form of CaSO4, is a common mineral and a key phase in gypsum's dehydration mechanism. An in-depth multi-scale investigation of its structure by powder X-ray diffraction revealed a very slight distortion of the crystal cell at room temperature (β = 90.092(9) °), that led to rule out the commonly admitted orthorhombic model (space group Cmcm) in favor of monoclinic C2/c subgroup. According to high-temperature XRD, the structure resumes however the orthorhombic symmetry around 400 °C.
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Beaugnon et al. - 2020 - On the monoclinic distortion of β-anhydrite CaSO4.pdf (541.07 Ko)
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