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Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): Recrystallization, transformation, and metamict states in chevkinite

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cris.lastimport.scopus2024-02-12T20:20:36Z
dc.abstract.enAnnealing is commonly used in the recrystallization of metamict minerals in an attempt to reconstruct the original structure. Annealing at 750 °C of Nb-rich chevkinite-(Ce) from the Biraya rare-metal deposit, Russia, resulted in the structural transformation C2/m → P21/a, which defines chevkinite stability in different environments. This transformation seems to be a rapid version of a naturally occurring process that possibly involves twinning of the crystals. Nb-rich chevkinite-(Ce) occurs naturally as two polymorphs, one with the C2/m space group and the other with P21/a. The latter is the stable form under ambient conditions. There are some distinct differences in the values of the structural parameters, such as the average M-O distances or site scattering values of particular sites for both space groups, which can be associated with the redistribution of some lighter cations, mainly Mg2+, within the crystal lattice. The use of complementary experimental techniques (electron probe microanalysis, X‑ray diffraction, and photoelectron spectroscopy) has delivered information on the structure and transformation of a very complex, highly zoned and partially metamict solid solution. It should be useful in determining the structure of any mineral where cation disorder is present.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorStachowicz, Marcin
dc.contributor.authorBagiński, Bogusław
dc.contributor.authorWoźniak, Krzysztof
dc.contributor.authorKartashov, Pavel M.
dc.contributor.authorMacdonald, Ray
dc.contributor.authorWelch, Mark D.
dc.date.accessioned2024-01-24T19:04:35Z
dc.date.available2024-01-24T19:04:35Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.number10
dc.description.volume104
dc.identifier.doi10.2138/AM-2019-6458
dc.identifier.issn0003-004X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/102764
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofAmerican Mineralogist
dc.relation.pages1481-1486
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enChevkinite
dc.subject.enannealing
dc.subject.encrystal structure
dc.subject.enmetamict
dc.subject.enrecrystallization
dc.titleCation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): Recrystallization, transformation, and metamict states in chevkinite
dc.typeJournalArticle
dspace.entity.typePublication