On the monoclinic distortion of β-anhydrite CaSO4 - Sorbonne Université
Journal Articles Solid State Sciences Year : 2020

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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Dates and versions

hal-03081518 , version 1 (18-12-2020)

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Florian Beaugnon, Sara Quiligotti, Sylviane Chevreux, Gilles Wallez. On the monoclinic distortion of β-anhydrite CaSO4. Solid State Sciences, 2020, 108, pp.106399. ⟨10.1016/j.solidstatesciences.2020.106399⟩. ⟨hal-03081518⟩
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