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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