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

DOI: 10.1103/PhysRevLett.109.095503 DOI Help
PMID: 23002847 PMID Help

Authors: R. Husband (School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, U.K.) , I. Loa (University of Edinburgh) , G. Stinton (School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, U.K.) , S. Evans (ESRF, France) , G. Ackland (School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, U.K.) , M. Mcmahon (University of Edinburgh)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 109 (9)

State: Published (Approved)
Published: August 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(q[1]0q[3])00. This new phase was observed to be stable to 37GPa, where another phase transition was observed. Eu-IV is the first phase in the lanthanide elements with an incommensurate crystal structure.

Subject Areas: Chemistry


Instruments: I15-Extreme Conditions

Other Facilities: ESRF

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