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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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Submitted on : Friday, December 18, 2020 - 11:05:57 AM
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Florian Beaugnon, Sara Quiligotti, Sylviane Chevreux, Gilles Wallez. On the monoclinic distortion of β-anhydrite CaSO4. Solid State Sciences, Elsevier, 2020, 108, pp.106399. ⟨10.1016/j.solidstatesciences.2020.106399⟩. ⟨hal-03081518⟩

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