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Europium-IV: An Incommensurately Modulated Crystal Structure in the Lanthanides

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http://prl.aps.org/abstract/PRL/v109/i9/e095503
Original languageEnglish
Article number095503
Number of pages5
JournalPhysical Review Letters
Volume109
Issue number9
Early online date29 Aug 2012
DOIs
Publication statusPublished - 31 Aug 2012

Abstract

High-resolution x-ray powder-diffraction experiments were performed on europium metal at high pressure up to 50 GPa. At variance with previous reports, the hcp phase of Eu was observed to be stable not only to 18 GPa, but to 31.5 GPa. At 31.5(5) GPa, europium transforms to a phase (Eu-IV) with an incommensurately modulated monoclinic crystal structure with superspace group C2/c(q1 0 q3)00. This new phase was observed to be stable to ~37.0 GPa, where another phase transition was observed. Eu-IV is the first phase in the lanthanide elements with an incommensurate crystal structure.

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