Title | Ultrafast X-Ray Diffraction Studies of the Phase Transitions and Equation of State of Scandium Shock Compressed to 82 GPa. |
---|---|
Authors | Briggs, R.; Gorman, M.G.; Coleman, A.L.; McWilliams, R.S.; McBride, E.E.; McGonegle, D.; Wark, J.S.; Peacock, L.; Rothman, S.; MacLeod, S.G.; Bolme, C.A.; Gleason, A.E.; Collins, G.W.; Eggert, J.H.; Fratanduono, D.E.; Smith, R.F.; Galtier, E.; Granados, E.; Lee, H.J.; Nagler, B.; Nam, I.; Xing, Z.; McMahon, M.I. |
Journal | Phys Rev Lett |
DOI | 10.1103/PhysRevLett.118.025501 |
Abstract |
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. |
Ultrafast X-Ray Diffraction Studies of the Phase Transitions and Equation of State of Scandium Shock Compressed to 82 GPa.