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Phase Transitions and Amorphization of M2AgF4 (M = Na, K, Rb) Compounds at High Pressure

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dc.abstract.enWe report the results of high-pressure Raman spectroscopy studies of alkali metal fluoroargentates (M2AgF4, where M = Na, K, Rb) combined with theoretical and X-ray diffraction studies for the K member of the series. Theoretical density functional calculations predict two structural phase transitions for K2AgF4: one from low-pressure monoclinic P21/c (beta) phase to intermediate-pressure tetragonal I42d structure at 6 GPa, and another to high-pressure triclinic P1 phase at 58 GPa. However, Raman spectroscopy and X-ray diffraction data indicate that both polymorphic forms of K2AgF4, as well as two other fluoroargentate phases studied here, undergo amorphization at pressures as low as several GPa. Keywords: double perovskite; post-perovskite; silver(II) fluorides; phase transitions; high pressure
dc.affiliationUniwersytet Warszawski
dc.contributor.authorGrochala, Wojciech
dc.contributor.authorStruzhkin, Viktor
dc.contributor.authorMazej, Zoran
dc.contributor.authorGrzelak, Adam
dc.contributor.authorWolański, Łukasz
dc.contributor.authorGawraczyński, Jakub
dc.date.accessioned2024-01-25T16:35:56Z
dc.date.available2024-01-25T16:35:56Z
dc.date.issued2022
dc.description.financeŚrodki finansowe przyznane na realizację projektu w zakresie badań naukowych lub prac rozwojowych
dc.description.number4
dc.description.volume12
dc.identifier.doi10.3390/CRYST12040458
dc.identifier.issn2073-4352
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/115793
dc.identifier.weblinkhttps://www.mdpi.com/2073-4352/12/4/458/pdf
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofCrystals
dc.relation.pages458
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titlePhase Transitions and Amorphization of M2AgF4 (M = Na, K, Rb) Compounds at High Pressure
dc.typeJournalArticle
dspace.entity.typePublication