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2020-01-29Zeitschriftenartikel DOI: 10.3390/min10020115
Insights into the CaSO4−H2O System: A Raman-Spectroscopic Study
dc.contributor.authorSchmid, Thomas
dc.contributor.authorJungnickel, Robert
dc.contributor.authorDariz, Petra
dc.date.accessioned2020-10-07T07:59:27Z
dc.date.available2020-10-07T07:59:27Z
dc.date.issued2020-01-29none
dc.date.updated2020-03-06T16:21:41Z
dc.identifier.urihttp://edoc.hu-berlin.de/18452/22699
dc.description.abstractEven 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.sponsorshipDeutsche Forschungsgemeinschaft
dc.language.isoengnone
dc.publisherHumboldt-Universität zu Berlin
dc.rights(CC BY 4.0) Attribution 4.0 Internationalger
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectgypsumeng
dc.subjectbassaniteeng
dc.subjecthemihydrateeng
dc.subjectanhydriteeng
dc.subjectdehydrationeng
dc.subjectrehydrationeng
dc.subjectphase transitioneng
dc.subjectcrystal defectseng
dc.subjectin situ Raman spectroscopyeng
dc.subjectRaman band widtheng
dc.subject.ddc550 Geowissenschaftennone
dc.titleInsights into the CaSO4−H2O System: A Raman-Spectroscopic Studynone
dc.typearticle
dc.identifier.urnurn:nbn:de:kobv:11-110-18452/22699-5
dc.identifier.doi10.3390/min10020115none
dc.identifier.doihttp://dx.doi.org/10.18452/22018
dc.type.versionpublishedVersionnone
local.edoc.container-titleMineralsnone
local.edoc.pages35none
local.edoc.type-nameZeitschriftenartikel
local.edoc.institutionMathematisch-Naturwissenschaftliche Fakultätnone
local.edoc.container-typeperiodical
local.edoc.container-type-nameZeitschrift
local.edoc.container-publisher-nameMDPInone
local.edoc.container-publisher-placeBaselnone
local.edoc.container-volume10none
local.edoc.container-issue2none
dc.description.versionPeer Reviewednone
local.edoc.container-articlenumber115none
dc.identifier.eissn2075-163X
local.edoc.affiliationSchmid, 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.comnone
local.edoc.affiliationJungnickel, Robert; Bundesanstalt für Materialforschung und -prüfung, Richard-Willstätter-Str. 11, 12489 Berlin, Germany, robert.jungnickel@posteo.denone
local.edoc.affiliationDariz, 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.eunone

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