Ultra-fast x-ray diffraction studies of the phase transitions and equation of state of scandium shock-compressed to 82 GPa

Ultra-fast 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 LCLS x-ray free electron laser, we have determined simultaneously and self-consistently the phase transitions and equation-of-state of the lightest transition metal, scandium, under shock compression. On compression scandium undergoes a structural phase transition betw...

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Main Authors: Briggs, B, Gorman, M, Coleman, A, McWilliams, R, McBride, E, McGonegle, D, Peacock, L, Rothman, S, Macleod, S, Bolme, C, Gleason, A, Collins, G, Eggert, J, Fratanduono, D, Smith, R, Galtier, E, Granados, E, Lee, H, Nagler, B, Nam, I, Xing, Z, Wark, J, McMahon, M
פורמט: Journal article
יצא לאור: American Physical Society 2017
תיאור
סיכום:Using x-ray diffraction at the LCLS x-ray free electron laser, we have determined simultaneously and self-consistently the phase transitions and equation-of-state 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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