High-pressure structural systematics in samarium up to 222 GPa

S. E. Finnegan, E. J. Pace, C. V. Storm, M. I. McMahon, S. G. MacLeod, H.-P. Liermann, and K. Glazyrin
Phys. Rev. B 101, 174109 – Published 15 May 2020

Abstract

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.

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  • Received 11 February 2020
  • Revised 9 April 2020
  • Accepted 14 April 2020

DOI:https://doi.org/10.1103/PhysRevB.101.174109

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. E. Finnegan, E. J. Pace, C. V. Storm, and M. I. McMahon*

  • SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom

S. G. MacLeod

  • AWE, Aldermaston, Reading RG7 4PR, United Kingdom and SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom

H.-P. Liermann and K. Glazyrin

  • DESY, Notkestrasse 85, D-22607 Hamburg, Germany

  • *m.i.mcmahon@ed.ac.uk

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Vol. 101, Iss. 17 — 1 May 2020

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