DC pole | Wartość | Język |
dc.contributor.author | Juroszek, Rafał | - |
dc.contributor.author | Krüger, Biljana | - |
dc.contributor.author | Galuskina, Irina | - |
dc.contributor.author | Krüger, Hannes | - |
dc.contributor.author | Tribus, Martina | - |
dc.contributor.author | Kürsten, Christian | - |
dc.date.accessioned | 2020-01-23T17:26:25Z | - |
dc.date.available | 2020-01-23T17:26:25Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Minerals, Vol. 10 (2020), Art. No. 38 | pl_PL |
dc.identifier.issn | 2075-163X | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12128/12198 | - |
dc.description.abstract | The crystal structure of bentorite, ideally Ca6Cr2(SO4)3(OH)12 26H2O, a Cr3+ analogue of
ettringite, is for the first time investigated using X-ray single crystal di raction. Bentorite crystals
of suitable quality were found in the Arad Stone Quarry within the pyrometamorphic rock of the
Hatrurim Complex (Mottled Zone). The preliminary semi-quantitative data on the bentorite
composition obtained by SEM-EDS show that the average Cr/(Cr + Al) ratio of this sample
is >0.8. Bentorite crystallizes in space group P31c, with a = b = 11.1927(5) Å, c =21.7121(10) Å,
V = 2355.60(18) Å3, and Z = 2. The crystal structure is refined, including the hydrogen
atom positions, to an agreement index R1 = 3.88%. The bentorite crystal chemical formula is
Ca6(Cr1.613Al0.387)S2[(SO4)2.750(CO3)0.499]S3.249(OH)11.502 ~25.75H2O. The Raman spectra of bentorite
from two di erent localities exhibit the presence of the main stretching and bending vibrations related
to the sulfate group at 983 cm1 ( 1), 1109 cm1 ( 3), 442 cm1 ( 2), and 601 cm1 ( 4). Moreover, the
presence of bands assigned to the symmetric Cr(OH)6
3 stretching mode and hydroxyl deformation
vibrations of Cr–OH units at ~540 cm1 and ~757 cm1, respectively, may be used to distinguish
between ettringite and bentorite. In situ high temperature single crystal XRD experiments show
that the decomposition of bentorite starts at ca. 45 C and that a dehydroxylation product similar to
metaettringite is formed. | pl_PL |
dc.language.iso | en | pl_PL |
dc.rights | Uznanie autorstwa 3.0 Polska | * |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/pl/ | * |
dc.subject | bentorite | pl_PL |
dc.subject | ettringite group | pl_PL |
dc.subject | SC-XRD | pl_PL |
dc.subject | Raman spectroscopy | pl_PL |
dc.subject | Hatrurim Complex | pl_PL |
dc.subject | Israel | pl_PL |
dc.title | Raman Spectroscopy and Single-Crystal High-Temperature Investigations of Bentorite, Ca6Cr2(SO4)3(OH)12.26H2O | pl_PL |
dc.type | info:eu-repo/semantics/article | pl_PL |
dc.identifier.doi | 10.3390/min10010038 | - |
Pojawia się w kolekcji: | Artykuły (WNP)
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