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Synchrotron x-ray diffraction experiments have been carried out on Eu metalat ambient temperature to pressures as high as 92 GPa (0.92 Mbar). Followingthe well-known bcc-to-hcp transition at 12 GPa, a mixed phase region isobserved from 18 to 66 GPa until finally a single orthorhombic (Pnma) phasepersists from 66 to 92 GPa. These results are compared to predictions fromdensity functional theory calculations. Under pressure the relatively largemolar volume Vmol of divalent Eu is rapidly diminished, equaling or fallingbelow Vmol(P) for neighboring trivalent lanthanides above 15 GPa. The presentresults suggest that above 15 GPa Eu is neither divalent nor fully trivalent topressures as high as 92 GPa.

Pressure-Induced Structure Transitions in Eu Metal to 92 GPa