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

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. Furthermore, 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.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [7] ;  [7] ;  [7] ;  [8] ;  [8] ;  [8] ;  [8] more »;  [8] ;  [8] ;  [9] « less
  1. The Univ. of Edinburgh, Edinburgh (United Kingdom)
  2. European XFEL, Hamburg (Germany)
  3. Univ. of Oxford, Oxford (United Kingdom)
  4. Atomic Weapons Establishment, Reading (United Kingdom)
  5. Atomic Weapons Establishment, Reading (United Kingdom); Imperial College London (United Kingdom)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  9. The Univ. of Edinburgh, Edinburgh (United Kingdom); Research Complex at Harwell, Oxon (United Kingdom)
Publication Date:
Report Number(s):
LA-UR-17-24602
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
EP/J017256/1; EP/J017051/1; AC52-07NA27344; AC52-06NA25396; AC02-76SF00515; SF00515; B595954
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1361149
Alternate Identifier(s):
OSTI ID: 1338660; OSTI ID: 1392882