Journal
PHYSICAL REVIEW B
Volume 83, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.104106
Keywords
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Funding
- Carnegie/DOE Alliance Center (CDAC) through NNSA/DOE [DE-FC52-08NA28554]
- Center for Materials Innovation
- National Science Foundation [DMR-0703896, EAR-0703226, DGE-0903653]
- DOE-NNSA
- DOE-BES [DE-AC02-06CH11357]
- US Department of Energy, National Nuclear Security Administration [DE-FC52-06NA26274]
- US Department of Energy [DE-FG05-08OR23339]
- National Center for Supercomputing Applications [DMR050036]
- Computational Center for Nanotechnology Innovation at Rensselaer Polytechnic Institute
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Synchrotron x-ray diffraction experiments have been carried out on europium metal at ambient temperature to pressures as high as 92 GPa (0.92 Mbar). Following the well-known bcc-to-hcp transition at 12 GPa, a mixed-phase region is observed from 18 to 66 GPa until finally a single orthorhombic (Pnma) phase persists from 66 to 92 GPa. These results are compared to predictions from density functional theory calculations. Under pressure the relatively large molar volume V-mol of divalent Eu is rapidly diminished, equaling or falling below V-mol(P) for neighboring trivalent lanthanides above 15 GPa. The present results suggest that above 15 GPa Eu is neither divalent nor fully trivalent to pressures as high as 92 GPa.
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