THE MONOCLINIC I2 STRUCTURE OF BASSANITE, CALCIUM SULFATE HEMIHYDRATES (CASO4∙0,5H2O)

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dc.contributor.author Ballirano P.
dc.contributor.author Maras A.
dc.contributor.author Meloni S.
dc.contributor.author Caminiti R.
dc.date.accessioned 2021-04-07T04:10:38Z
dc.date.available 2021-04-07T04:10:38Z
dc.date.issued 2001
dc.identifier https://www.elibrary.ru/item.asp?id=28837792
dc.identifier.citation European Journal of Mineralogy, 2001, 13, 5, 985-993
dc.identifier.issn 0935-1221
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/27568
dc.description.abstract A structural analysis of CaSO4 . 0.5H(2)O, a dehydration product of gypsum, has been carried out through the Rietveld method on X-ray powder diffraction data. A dehydrated powder of synthetic gypsum has been charged inside a non-hermetically sealed capillary in order to allow a slow rehydration. The starting material has been identified as gamma -anhydrite, space group P6(2)22, cell parameters a = 6.9691(2) Angstrom, c=6.3033(2) Angstrom. The final product of the rehydration of gamma -anhydrite is CaSO4 . 0.5H(2)O, space group I2 (unique axis b), cell parameters a = 12.0350(5) Angstrom, b = 6.9294(3) Angstrom, c = 12.6705(4) Angstrom, beta = 90.266(3)degrees. The structure of the hemihydrate is strongly pseudo-trigonal, space group P3(1)21. The symmetry lowering arises from water molecules ordering inside the channels.
dc.subject γ-anhydrite
dc.subject CaSO4·0.5H2O
dc.subject bassanite
dc.subject gypsum
dc.subject X-ray powder diffraction
dc.subject Rietveld method
dc.title THE MONOCLINIC I2 STRUCTURE OF BASSANITE, CALCIUM SULFATE HEMIHYDRATES (CASO4∙0,5H2O)
dc.type Статья


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