期刊
SOLID STATE SCIENCES
卷 108, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2020.106399
关键词
Anhydrite; Gypsum; Crystal structure; Phase transition; X-ray diffraction; Rietveld method
资金
- LabEx MATISSE
- Saint-Gobain Research Paris
beta-anhydrite, the stable form of CaSO4, is a common mineral and a key phase in gypsum's dehydration mecha-nism. 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 (beta = 90.092(9) degrees), 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 degrees C.
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