Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.025501
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Funding
- EPSRC [EP/J017256/1, EP/J017051/1]
- LLNS [B595954]
- VolkswagenStiftung
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Science Campaign 2 at Los Alamos National Laboratory
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences [SF00515]
- National Nuclear Security Administration of the U.S. Department of Energy [DE-AC52-06NA25396]
- Diamond Light Source (DLS)
- Engineering and Physical Sciences Research Council [1263489, EP/J017051/1, 1527117, EP/J017256/1] Funding Source: researchfish
- EPSRC [EP/J017256/1, EP/J017051/1] Funding Source: UKRI
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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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