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Ultrafast X-Ray Diffraction Studies of the Phase Transitions and Equation of State of Scandium Shock Compressed to 82 GPa

Research output: Contribution to journalArticle

  • M G Gorman
  • A L Coleman
  • E E McBride
  • D McGonegle
  • J S Wark
  • L Peacock
  • S Rothman
  • S G Macleod
  • C A Bolme
  • A E Gleason
  • G W Collins
  • J H Eggert
  • D E Fratanduono
  • R F Smith
  • E Galtier
  • E Granados
  • H J Lee
  • B Nagler
  • I Nam
  • Z Xing

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Original languageEnglish
Article number025501
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 13 Jan 2017


Using x-ray diffraction at the Linac Coherent Light Source x-ray free-electron laser, we have determined simultaneously and self-consistently the phase transitions and equation of state (EOS) of the lightest transition metal, scandium, under shock compression. On compression scandium undergoes a structural phase transition between 32 and 35 GPa to the same bcc structure seen at high temperatures at ambient pressures, and then a further transition at 46 GPa to the incommensurate host-guest polymorph found above 21 GPa in static compression at room temperature. Shock melting of the host-guest phase is observed between 53 and 72 GPa with the disappearance of Bragg scattering and the growth of a broad asymmetric diffraction peak from the high-density liquid.

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