High-Pressure Structural Systematics in Samarium to 222 GPa

Sarah Finnegan, Ed Pace, Christian Storm, Malcolm McMahon, S G MacLeod, H.-p. Liermann, K. Glazyrin

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Angle-dispersive x-ray powder diffraction experiments have been performed on samarium metal up to 222 GPa. Up to 50 GPa we observe the Sm type (hR9) → dhcp (hP4) → fcc (cF4) → distorted fcc (hR24) →hP3 transition sequence reported previously. The structure of the high-pressure phase above 93 GPa, previously reported as having a monoclinic structure with space group C2/m, is found to be orthorhombic, space group Fddd, with eight atoms per unit cell (oF8 in Pearson notation). This structure is the same as that found in Am, Cm, and Cf at high pressures. Analysis of samarium's equation of state reveals marked changes in compressibility in the hP3 and oF8 phases, with the compressibility of the oF8 phase being that of a “regular” metal.
Original languageEnglish
Article number174109
JournalPhysical Review B
Issue number17
Publication statusPublished - 15 May 2020


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