Insights into the CaSO4−H2O System: A Raman-Spectroscopic Study
dc.contributor.author | Schmid, Thomas | |
dc.contributor.author | Jungnickel, Robert | |
dc.contributor.author | Dariz, Petra | |
dc.date.accessioned | 2020-10-07T07:59:27Z | |
dc.date.available | 2020-10-07T07:59:27Z | |
dc.date.issued | 2020-01-29 | none |
dc.date.updated | 2020-03-06T16:21:41Z | |
dc.identifier.uri | http://edoc.hu-berlin.de/18452/22699 | |
dc.description.abstract | Even though being the subject of natural scientific research for many decades, the system CaSO4–H2O, consisting of the five crystalline phases gypsum, bassanite, and the anhydrites III, II, and I, has left many open questions for research. Raman spectroscopy was used because of its structural sensitivity and in situ measurement capability to obtain further insight by studying phase transitions in both ex situ and in situ experiments. The findings include significant contributions to the completeness and understanding of Raman spectroscopic data of the system. The dehydration path gypsum–bassanite–anhydrite III was shown to have strong parallels to a physical drying process, which depends on many parameters beyond the burning temperature. Raman band width determination was demonstrated to enable the quantitative discrimination of -bassanite and -bassanite as well as the postulated three sub-forms of anhydrite II (AII), which are all based on differences in crystallinity. In the latter case, the observed continuous structural variations over increasing burning temperatures were elucidated as a combination of decreasing surface areas and healing of crystal lattice defects. We propose an only two-fold sub-division of AII into reactive “disordered AII” and much less reactive “crystalline AII” with a transition temperature of 650 °C ± 50 K. | eng |
dc.description.sponsorship | Deutsche Forschungsgemeinschaft | |
dc.language.iso | eng | none |
dc.publisher | Humboldt-Universität zu Berlin | |
dc.rights | (CC BY 4.0) Attribution 4.0 International | ger |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.subject | gypsum | eng |
dc.subject | bassanite | eng |
dc.subject | hemihydrate | eng |
dc.subject | anhydrite | eng |
dc.subject | dehydration | eng |
dc.subject | rehydration | eng |
dc.subject | phase transition | eng |
dc.subject | crystal defects | eng |
dc.subject | in situ Raman spectroscopy | eng |
dc.subject | Raman band width | eng |
dc.subject.ddc | 550 Geowissenschaften | none |
dc.title | Insights into the CaSO4−H2O System: A Raman-Spectroscopic Study | none |
dc.type | article | |
dc.identifier.urn | urn:nbn:de:kobv:11-110-18452/22699-5 | |
dc.identifier.doi | http://dx.doi.org/10.18452/22018 | |
dc.type.version | publishedVersion | none |
local.edoc.pages | 35 | none |
local.edoc.type-name | Zeitschriftenartikel | |
local.edoc.container-type | periodical | |
local.edoc.container-type-name | Zeitschrift | |
dc.description.version | Peer Reviewed | none |
dc.identifier.eissn | 2075-163X | |
dcterms.bibliographicCitation.doi | 10.3390/min10020115 | none |
dcterms.bibliographicCitation.journaltitle | Minerals | none |
dcterms.bibliographicCitation.volume | 10 | none |
dcterms.bibliographicCitation.issue | 2 | none |
dcterms.bibliographicCitation.articlenumber | 115 | none |
dcterms.bibliographicCitation.originalpublishername | MDPI | none |
dcterms.bibliographicCitation.originalpublisherplace | Basel | none |
bua.import.affiliation | Schmid, Thomas; Bundesanstalt für Materialforschung und -prüfung, Richard-Willstätter-Str. 11, 12489 Berlin, Germany, thomas@schmid.eu.com; School of Analytical Sciences Adlershof (SALSA), Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany, thomas@schmid.eu.com | none |
bua.import.affiliation | Jungnickel, Robert; Bundesanstalt für Materialforschung und -prüfung, Richard-Willstätter-Str. 11, 12489 Berlin, Germany, robert.jungnickel@posteo.de | none |
bua.import.affiliation | Dariz, Petra; School of Analytical Sciences Adlershof (SALSA), Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany, petra@petradariz.eu; Bern University of Applied Sciences, Bern University of the Arts, Conservation-Restoration, Fellerstr. 11, 3027 Bern, Switzerland, petra@petradariz.eu | none |
bua.department | Mathematisch-Naturwissenschaftliche Fakultät | none |